1797 FLEX Ex I/O
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1797 FLEX Ex I/O Modules
FLEX™ Ex I/O takes advantage of the modular FLEX I/O platform and combines it with Intrinsic Safety (IS) technology. FLEX Ex I/O can be distributed right into hazardous areas (Zone 1), providing significant design, installation, and wiring savings. FLEX Ex I/O is compatible with the 1794 FLEX I/O system for added flexibility.
Benefits
- Can be mounted near controlled equipment, eliminating long runs of multiple cables, conduit, and messy sealing.
- Built-in galvanic isolation eliminates need for IS barriers/isolators.
- Advanced diagnostics provides real-time status for quicker and easier troubleshooting.
- Configuration alternatives address a wide range of application needs.
- Removal and insertion under power makes it possible to replace modules and make cable connections in the hazardous area while the system is in operation.
- Rated for Class I, II, and III / Div 1, Zone 1 and 22 to allow mounting in hazardous locations.
- Conformal Coating of all FLEX Ex modules provides protection against corrosive elements.
Product Design
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FLEX Ex I/O modules (1797) offer 2 through 16 I/O each. You can plug together a maximum of eight FLEX Ex I/O modules with a FLEX Ex I/O or FLEX I/O communications adapter, for a maximum of 128 I/O per assembly. The I/O modules are interfaced to the I/O link through an I/O adapter module.
The FLEX Ex I/O assembly is modular. Each I/O module plugs into a terminal base. The modular terminal bases form the backplane and provide terminal connection points for I/O wiring. The I/O adapter module plugs into the end terminal base. You snap the I/O adapter and the terminal bases onto a DIN rail and plug them together. The power supply is free-standing, saving cabinet space.
The FLEX Ex I/O family consists of the following modular components:
- Communications Adapter. FLEX Ex for ControlNet for hazardous area installation or standard FLEX adapters.
- I/O Module. Intrinsically safe (IS), offering 2 through 16 I/O.
- Terminal Base. Terminal bases snap onto a DIN rail and provide terminal connection points for an I/O module, as well as the backplane connection between the communication adapter and I/O modules.
- ControlNet Ex Repeater Module and one or two Fiber Media Port Adapters provide maximum distance and expandability.
- ControlNet Ex Coax Barrier option versus fiber hub approach for communication to the hazardous area.
- Extender Cables. Available in 1-ft. and 3-ft. lengths, an extender cable lets you arrange the I/O assembly in two rows, either horizontally or vertically.
- FLEX Ex Bus Isolator Pair for use with standard FLEX communications adapters and FlexLogix controllers.
- Power Supply. 120V ac or 24V dc options with either conduit pipe thread or increased safety connections.
Communication
The dual media ControlNet Ex I/O communications adapter module (1797-ACNR15) provides an interface for communication between the I/O modules in the hazardous area and a scanner port for a programmable controller processor across an I/O link. It is capable of redundant media operation. The ControlNet Ex I/O adapter module interfaces with the modular backplane made up of terminal bases to communicate with the I/O modules. The adapter module interfaces to a coax ControlNet Ex segment in the hazardous area.
The coax ControlNet Ex segment within the hazardous area, in turn, is interfaced through a coax repeater module (1797-RPA) and fiber media port adapter (1797-RPFM) to a fiber-optic ControlNet Ex segment, which can cross the boundary between the hazardous area and the safe area. In the safe area, the fiber-optic segment is interfaced to a coax ControlNet segment to provide a path for communication with a scanner port for a programmable controller processor. Or, the coax ControlNet Ex segment within the hazardous area can be interfaced to a ControlNet Ex coax barrier (1797-BCNR). It is also capable of redundant media operation.
With the FLEX Ex bus isolator pair, you can connect FLEX and FLEX Ex modules to the same adapter, allowing combinations of intrinsically safe (IS) and non-IS systems. This provides a cost-effective means to use FLEX Ex in lower point count applications, and allows connection to other FLEX I/O adapters and alternative networks. The bus isolator pair consists of a bus isolator module (1797-BIC) and FLEXBus connector (1797-CEC). The bus isolator pair can be used with these FLEX I/O communications adapters: DeviceNet (1794-ADN), ControlNet (1794-ACN15), Redundant ControlNet (1794-ACNR15), Universal Remote I/O (1794-ASB), and EtherNet/IP (1794-AENT). It can also be used with FlexLogix controllers. A FLEX Ex power supply is required to power the FLEX Ex modules regardless of location.
Typical Configurations
The following are typical configurations of FLEX Ex I/O in an intrinsically safe system:
- FLEX Ex I/O modules are interfaced through a ControlNet Ex I/O adapter module to a coax ControlNet segment that is confined to the hazardous area. This coax ControlNet Ex segment is interfaced through a ControlNet Ex coax drop repeater module and ControlNet Ex fiber media port adapter to a fiber-optic ControlNet segment, which is fed through from the safe area. A FLEX Ex power supply powers the repeater module, fiber media port adapter, ControlNet Ex I/O adapter module, and I/O modules individually. This configuration is best for long distances and a large number of nodes.
- The FLEX Ex ControlNet barrier allows connection to a ControlNet Ex I/O adapter module in the hazardous area via coax directly from the safe area. The barrier is mounted in the safe area. This is more economical for intermediate distances and nodes.
- Sensors and actuators in a hazardous area can be connected to FLEX Ex I/O modules, which are connected through a bus isolator module and connector to a FLEX I/O adapter in a safe area thus allowing connectivity to DeviceNet, ControlNet, Universal Remote I/O, and EtherNet/IP. This configuration may be most economical for low-point applications or when networks other than ControlNet are required.
- FLEX Ex I/O modules in a hazardous area can be connected through an extender cable to a FLEXBus feed-through connector in an explosion-proof enclosure. Inside the enclosure, the feed-through connector is connected through a FLEX Ex extender cable, and then a bus isolator module and connector, to a FLEX I/O adapter.
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Specifications
Use in North American Hazardous Locations
FLEX Ex modules are rated for installation in Class I Division 1 & 2, Groups A-D hazardous areas. They are also rated to connect to field devices that are located in Class I, II, or III, Groups A-G hazardous areas.
If FLEX Ex components are to be installed in a Class II or III location in your application, you can mount them in a suitable, dust-proof enclosure with the appropriate connectors, glans, and seals. For example, a NEMA 9 enclosure may be appropriate. The FLEX Ex modules are rated to connect to devices in Class II or III locations.
FLEX Ex modules are rated for installation in North American Class I Zone 1 & 2, Groups IIC, IIB, & IIA hazardous areas. They are also rated to connect to field devices that are located in North American Class I Zone 0, 1, & 2, Groups IIC, IIB, & IIA hazardous areas.
As always, observe local code requirements when applying your FLEX Ex application.
Use in CENELEC Hazardous Locations
FLEX Ex modules are rated for installation in European Zones 1, 2, and 22. They are also rated to connect to field devices that are located in European Zones 0, 1, 2, 21, and 22 hazardous areas. The FLEX Ex power supplies (1797-PS1E and -PS2E2) are rated for use in Zones 1 and 22.
If FLEX Ex components are to be installed in a European Zone method dust or fiber location in your application, you must mount them in an approved, dust-proof enclosure with the appropriate connectors, glans, and seals. Pepperl+Fuchs have three cabinets that are approved for use with FLEX Ex components in Zone 22 applications: IVK2-ISRPI-V8LC; IVK2-ISRPI-V8HYW; and IVK2-ISRPI-V16LC. P+F has offices in Twinsburg, Ohio, USA, and Mannheim, Germany. See their website at http://www.pepperl-fuchs.com.
As always, observe local code requirements when applying your FLEX Ex application.
General Specifications
| Enclosure Type Rating | IP20 |
| Mounting Type | DIN-rail, Panel |
| Operating Temperature | -20…70 °C (-4…158 °F) |
| Nonoperating Temperature | -40…85 °C (-40…185 °F) |
| Relative Humidity | 5…95% noncondensing |
| Operating Shock | 15 g peak acceleration, 11 (±1) ms pulse width |
| 30 g peak acceleration, 11 (±1) ms pulse width | |
| Nonoperating Shock | 15 g peak acceleration, 11 (±1) ms pulse width |
| 30 g peak acceleration, 11 (±1) ms pulse width | |
| 50 g peak acceleration, 11 (±1) ms pulse width | |
| Vibration | 2 g at 10…500 Hz |
| 5 g at 10…500 Hz per IEC 68-2-6 | |
| Conformal Coating / Noxious Gas Exposure⋆ | Tested to severity level G3, ISA-S71.04-1985 |
| ⋆ Does not apply to 1797-BCNR. | |
Dimensions and Weights
| Cat. No. | Dimensions (H x W x D), Approx. | Weight |
| I/O Modules | 46 x 94 x 75 mm (1.8 x 3.7 x 2.95 in) | 0.2 kg (0.4 lb) |
| 1797-ACNR15 | 94 x 94 x 91 mm (3.7 x 3.7 x 3.58 in) | 0.2 kg (0.4 lb) |
| 1797-RPA | ||
| 1797-RPFM | 0.1 kg (0.3 lb) | |
| 1797-BCNR | 70 x 100 x 90 mm (2.76 x 3.94 x 3.55 in) | 0.2 kg (0.4 lb) |
| 1797-BIC | 87 x 94 x 75 mm (3.4 x 3.7 x 2.95 in) | 0.2 kg (0.4 lb) |
| 1797-CEC | 80 x 55 x 69 mm (3.15 x 2.17 x 2.72 in) | 0.1 kg (0.2 lb) |
| 1797-PS1E | 174 x 174 x 280 mm (6.9 x 6.9 x 11.0 in) | 7.7 kg (17 lb) |
| 1797-PS2E2 | ||
| 1797-PS1N | 174 x 174 x 128 mm (6.9 x 6.9 x 5.04 in) | 7.3 kg (16 lb) |
| 1797-PS2N2 | ||
| Terminal Bases | 94 x 94 x 69 mm⋆ (3.7 x 3.7 x 2.7 in⋆ ) | 0.2 kg (0.5 lb) |
| Extender Cables | ‡ | 0.1 kg (0.2 lb) |
| ⋆ With module installed in base. ‡ 1794-CE1, 1797-CE1S: 0.3m (1 ft) cable; 1794-CE3, 1797-CE3S: 0.9m (3 ft) cable. |
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Communications Adapter
The diagnostic capabilities and determinism of the ControlNet network, along with its ability to be intrinsically safe, make it an ideal choice for distributing I/O into hazardous area applications. The redundant media ControlNet Ex communications adapter (1797-ACNR15) is high-speed and capable of communicating with as many as eight I/O modules for up to 128 I/O points.
The ControlNet Ex segment in the hazardous area must be protected from other ControlNet segments in safe areas. Isolation can be achieved via two approaches: by converting coax to fiber with a pair of fiber hubs/repeaters or by using a coax barrier.
An intrinsically safe network and I/O system installed in the hazardous area allows your data to be gathered at its origin and transported out of the area with the minimum amount of wiring. Cable penetrations into the hazardous area, cable trays, and conduit are all drastically reduced.
| Cat. No. | Description | Communication Interface | Communication Rate | Power Dissipation (W) | |
| 1797-ACNR15 | Dual Media ControlNet Ex 1.5 Adapter | The 1797-ACNR15 interfaces FLEX Ex I/O modules to a coax segment of a ControlNet Ex I/O link. It provides power to the backplane to run bus interface circuitry aboard I/O modules and is capable of dual ControlNet Ex cable media. I/O module capacity: 8 | Quad-shield RG-6 coax (ControlNet Ex link) | 5 Mbps | 8.5 W |
| 1797-RPA | ControlNet Ex Coax Drop Repeater Module | The 1797-RPA functions as part of the fiber repeater hub within the hazardous area to extend the length of the ControlNet Ex segments to interlink systems all operating within the area. Fiber media port adapter capacity: 2 | Quad-shield RG-6 coax (ControlNet Ex link) | 5 Mbps | 8.5 W |
| 1797-RPFM | ControlNet Ex 3 km Fiber Media Port Adapter | The 1797-RPFM (part of the fiber repeater hub) functions as a non-intelligent fiber to backplane conversion device and converts glass fiber infrared LED media signals to backplane signals for use by the 1797-RPA repeater module. | 62.5/125-micron fiber (ControlNet Ex link) | 5 Mbps | Included in 1797-RPA |
| 1797-BCNR | Redundant ControlNet Barrier Module | The redundant media ControlNet coax barrier (1797-BCNR) isolates the ControlNet segment in the safe area from that in the hazardous area. It allows connection into the hazardous area without converting to/from fiber media. The barrier can support up to 20 adapters and distances up to 500 meters. | — | ||
| 1797-BIC | Bus Isolator Module | The bus isolator modules, 1797-BIC and -CEC, allow you to configure FLEX Ex modules and FLEX I/O modules on the DIN rail when attached to the same adapter and grouped together on appropriate sides of the bus isolator module. This highly flexible, cost-effective solution combines intrinsically safe and non-intrinsically safe systems. I/O module capacity: 8⋆ | 2.1 W | ||
| 1797-CEC | Flexbus Connector Module | — | |||
| ⋆ 8 FLEX Ex modules. Note that a total of eight I/O modules can be attached to a 1794 FLEX I/O adapter. The 1797-BIC and 1797-CEC are not included in this number. In intermixed systems, the number of 1797 FLEX Ex I/O modules (attached onto the 1797-BIC) plus the number of 1794 FLEX I/O modules (connected between the adapter and the 1797-CEC) cannot exceed eight. | |||||
Certifications
| Cat. No. | Certifications⋆ |
| 1797-ACNR15 | CENELEC: Class I Division 1 Groups A...D T4 UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 Class II Division 1 Groups E, F, G; Class III‡ FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-RPA | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 Class II Division 1 Groups E, F, G(1); Class III‡ FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-RPFM | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib [ia] IIC T4 Class II Division 1 Groups E, F, G(1); Class III‡ FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-BIC | CENELEC: II (2) G [EEx ib] IIC II (2D) FM: Nonincendive, use for Class I, Division 2 Groups A...D or Class I, Zone 2 Group IIC Provides intrinsically safe outputs to Class I, Division 1 Groups A...D or Class I, Zone 1 Group IIC INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-CEC | FM: Nonincendure, use for Class I, Division 2 Groups A…D or Class I, Zone 2 Group IIC |
| 1797-BCNR | CENELEC: II (2) G [EEx ib] IIC UL, C-UL: Class I Division 1 Groups A...D T4 Class II Division 1 Groups E, F, G; Class III |
| ⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6. | |
Digital I/O Modules
- Modules are available in different densities ranging from 8 to 16 points.
- Electrical ranges from 65V ac to 276V ac and from 10V dc to 60V dc.
- Isolated inputs and outputs can be used in application such as motor control centers where individual control transformers are used.
- Protected outputs (P) have auto-reset of outputs.
- Modules detect, indicate, and report the following faults:
- open input or output field devices or wiring
- shorted output field devices
- shorted input or output wiring
- open input or output field devices or wiring
- Selectable input filter times from <1 to 60 ms.
- LED for each channel indicating status of:
- corresponding input device
- output signal
- corresponding input device
FLEX Ex Digital dc Input Module
16-point non-isolated NAMUR input module.
| Cat. No. | Number of Inputs | Voltage, On-State Input, Nom. | Input Delay Time⋆ | Current, Off-State Input, Max. | Power Dissipation, Max. | Terminal Base Unit |
| 1797-IBN16 | 16 | NAMUR compatible | 1…33 ms selectable | 1.2 mA | 2.8 W | 1797-TB3, 1797-TB3S |
| ⋆ OFF to ON and ON to OFF. |
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FLEX Ex Digital dc Output Module
| Cat. No. | Number of Outputs | Voltage, On-State Output, Nom. | Output Delay Time⋆ | Power Dissipation, Max. | Terminal Base Unit |
| 1797-OB4D | 4 current sourcing | 24V DC | £ 1.2 ms | 5 W | 1797-TB3, 1797-TB3S |
| ⋆ OFF to ON and ON to OFF. | |||||
1797-OB4D Output Voltage/Current Capability
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Certifications
| Cat. No. | Certifications⋆ |
| 1797-IBN16 | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib[ia] IIC T4 Class II Division 1 Groups E, F, G(1); Class III‡ FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-OB4D | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib[ia] IIC T4 Class II Division 1 Groups, E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| ⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6. | |
Analog I/O Modules
- Configurable channels allow the module to be used with a variety of sensors.
- Selectable input filters allows you to select from several different filter frequencies for each channel that best meets the performance needs of your application based on environmental limitations. Lower filter settings provide greater noise rejection and resolution. Higher filter settings provide faster performance.
- On-board scaling eliminates the need to scale the data in the controller. Controller processing time and power are preserved for more important tasks, such as I/O control, communications, or other user-driven functions.
FLEX Ex Analog Input Modules
- Resolution: 16 bits
- Accuracy: 0.1%
- Data format: Configurable
| Cat. No. | Number of Inputs | Input Signal Range⋆ | Update Time, Module from Adapter | Step Response to 99% of Full Scale | Power Dissipation, Max. | Terminal Base Unit |
| 1797-IE8 | 8 single-ended | 0…20 mA | 200…1600 ms | 4 ms | 5.2 W | 1797-TB3, 1797-TB3S |
| 1797-IE8H‡ | 8 single-ended | 0…20 mA | 200…1600 ms | 80 ms | 5.2 W | 1797-TB3, 1797-TB3S |
| 1797-IE8NF§ | 8 single-ended | 0…20 mA | 200…1600 ms | 80 ms | 5.2 W | 1797-TB3, 1797-TB3S |
| ⋆ Each module's channels are selectable. ‡ Supports pass-through of HART commands as unscheduled ControlNet messages. Compatible with FDT software packages. § With noise filter. |
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FLEX Ex RTD Theromcouple/mV Input Module
| Cat. No. | Number of Inputs | Input Signal Range | Power Dissipation, Max. | Terminal Base Unit |
| 1797-IRT8 | 8 RTD, Thermocouple/mV | 0…500 W -40…100 mV TC RTD |
1.6 W | 1797-TB3, 1797-TB3S |
| Features | |
| RTD Mode | • 2-, 3-, 4-wire connection • sensor lead breakage and short circuit detection all 4 leads • measuring resistance 0…500W • accuracy: 0.1% of span @ 20 °C, filter cutoff <1 Hz |
| mV Mode | • input voltage -40…100 mV differential sensing • sensor breakage detection |
| Thermocouple Mode | • types B, E, J, K, TXK/XK (L), N, R, S, T • cold junction compensation (CJC) • sensor breakage detection • accuracy: 0.1% of span, filter cutoff <1 Hz • accuracy of CJC: ±1 C/K |
FLEX Ex Analog Output Modules
- Resolution: 13 bits
- Accuracy: 0.1%
- Channel update: £4 ms
| Cat. No. | Number of Outputs | Output Signal Range⋆ | Step Response to 99% of Full Scale | Power Dissipation, Max. | Terminal Base Unit |
| 1797-OE8 | 8 single-ended | 4…20 mA | 4 ms | 5.4 W | 1797-TB3, 1797-TB3S |
| 1797-OE8H‡ | 8 single-ended | 4…20 mA | 4 ms | 6.1 W | 1797-TB3, 1797-TB3S |
| ⋆ Each module's channels are selectable. ‡ Supports pass-through of HART commands as unscheduled ControlNet messages. Compatible with FDT software packages. |
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1797-OE8 and -OE8H Output Voltage/Current Capability
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Certifications
| Cat. No. | Certifications⋆ |
| 1797-IE8 | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 Class II Division 1 Groups E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-IE8NF | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 Class II Division 1 Groups E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 |
| 1797-IRT8 | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 Class II Division 1 Groups E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-OE8 | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 Class II Division 1 Groups E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| ⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6. | |
Counter I/O Modules
- Four selectable ranges: 50 mV; 500 mV (magnetic pickupt); flowmeter; and NAMUR.
- Channel update: £4 ms (according to sampling time)
| Cat. No. | Number of Inputs/Outputs | Input Frequency, Max. | Frequency Input, Characteristics | Power Dissipation, Max. | Terminal Base Unit |
| 1797-IJ2 | • Inputs: 2 frequency inputs, 2 gate inputs • Outputs: 2 outputs |
1.0…32,767 Hz | Magnetic pickup: 50 mV, 500 mV NAMUR: 8V, 8 mA Flowmeter: low ³ 3V, high £ 6V |
4.25 W | 1797-TB3, 1797-TB3S |
| The Input Frequency Counter Module is an intelligent I/O module that is designed to perform high-speed frequency algorithms. The module provides two frequency inputs, two gate inputs, and two outputs. The frequency inputs are capable of accepting frequencies up to 32 KHz. The module accepts and returns binary data. Input devices range from magnetic pickup to flowmeters, to incremental encoders to proximity detectors. All power for input devices (24V dc) is supplied by the module. Outputs are activated by alarms. | |||||
Certifications
| Cat. No. | Certifications⋆ |
| 1797-IJ2 | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 Class II Division 1 Groups E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| ⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6. | |
HART Smart Instrumentation
HART (Highway Addressable Remote Transmitter) is an open protocol designed to connect analog devices. For HART connectivity, select from products available from Rockwell Automation and our Encompass partners.
Select a HART Interface
| For Your Application | Select | Description |
| 1794 FLEX I/O 1797 FLEX Ex I/O |
FLEX I/O and FLEX Ex modules designed for distributed HART systems. | |
| 1756-IF8H 1756-OF8H |
Rockwell Automation analog I/O modules for use in ControlLogix chassis | |
| MVI56-HART | Prosoft interface | |
HART Interface Modules
FLEX and FLEX Ex HART analog modules (IE8H and OE8H) are ideal for use in applications that need connection with FDT (Field Device Tool) compatible asset management software, such as the Rockwell Software FieldCare HART Communication bundle or Endress + Hauser Fieldcare. Device Type Management (DTM) programs and drivers are provided on the website.
- FLEX HART analog modules can be used on ControlNet or EtherNet/IP. The FLEX Ethernet adapter requires firmware v3.1, which is flash upgradeable, to support these modules.
- Each HART field device is wired to its own input or output channel:
- 8 single-ended channels
- does not support multi-drop
- 2- or 3-wire devices
- 8 single-ended channels
- For use with FlexLogix, the modules must be used on distributed rail with ControlNet adatper and not on local rail.
- HART commands can be transmitted by unscheduled message::
- sample RLL subroutines available
- currently limited to of one instance of RLL subroutine per module, one channel at at time
- sample RLL subroutines available
HART Analog Input Module
| Cat. No. | Number of Inputs | Input Signal Range⋆ | Update Time, Module from Adapter | Step Response to 99% of Full Scale | Power Dissipation, Max. | Terminal Base Unit |
| 1797-IE8H‡ | 8 single-ended | 0…20 mA | 200…1600 ms | 80 ms | 5.2 W | 1797-TB3, 1797-TB3S |
| ⋆ Each module's channels are selectable. ‡ Supports pass-through of HART commands as unscheduled ControlNet messages. Compatible with FDT software packages. |
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HART Analog Output Module
| Cat. No. | Number of Outputs | Output Signal Range⋆ | Step Response to 99% of Full Scale | Power Dissipation, Max. | Terminal Base Unit |
| 1797-OE8H‡ | 8 single-ended | 4…20 mA | 4 ms | 6.1 W | 1797-TB3, 1797-TB3S |
| ⋆ Each module's channels are selectable. ‡ Supports pass-through of HART commands as unscheduled ControlNet messages. Compatible with FDT software packages. |
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1797-OE8 and -OE8H Output Voltage/Current Capability
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Certifications
| Cat. No. | Certifications⋆ |
| 1797-IE8H | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4 II (1D) (2D) UL, C-UL: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 Class II Division 1 Groups E, F, G; Class III FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib/[ia] IIC T4 |
| 1797-OE8H | CENELEC: II (1) 2G EEx ia/ib IIB/IIC T4, II (1D)(2D) |
| ⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6. | |
Terminal Bases
Each FLEX Ex I/O module requires a FLEX Ex terminal base unit that snaps onto the DIN rail to the right of the I/O adapter. The terminal bases provide terminal connection points for I/O wiring and plug together to form the backplane. They are available with screw and spring terminations.
| Cat. No. | Number of Terminals | Termination Type | Wire Size | Terminal Base Screw Torque |
| 1797-TB3 | 1 row of 16 2 rows of 18 |
Cage-clamp | 22…12 AWG (0.34 mm2…2.5 mm2) stranded copper wire rated at 75 °C or higher 1.2 mm (3/64 in) insulation max. |
7…9 lb•in |
| 1797-TB3S | Spring-clamp | — | ||
Certifications
| Cat. No. | Certifications⋆ |
| 1797-TB3 | CENELEC: II 2G EEx ia IIC T4 UL, C-UL: Class I Division 1 & 2 Groups A...D T4 Class I Zone 1 & 2 AEx ia IIC T4 Class II Division 1 Groups E, F, G; Class III‡ FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib [ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-TB3S | CENELEC: II 2G EEx ia IIC T4 UL, C-UL: Class I Division 1 & 2 Groups A...D T4 Class I Zone 1 & 2 AEx ia IIC T4 Class II Division 1 Groups E, F, G; Class III‡ FM: Class I Division 1 Groups A...D T4 Class I Zone 1 AEx ib [ia] IIC T4 INMETRO: BR-Ex ib IIB/IIC T4 |
| ⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6. | |
Power Supplies
The power supply is an essential component in the operation of an intrinsically safe system. It isolates the unsafe incoming power from the control system and limits the available energy to IS-safe levels.
FLEX Ex power supplies provide power for the FLEX Ex ControlNet network, communication adapter, I/O modules, fiber hub, and IS field devices. No other power sources are needed to operate any components attached to the FLEX Ex system in the hazardous area. Power for valves, actuators, or transmitters come from the FLEX Ex modules.
There are two types of enclosures: (N-Type) explosion-proof with 1 in. conduit pipe thread input/output terminations and (E-Type) flame-proof with increased safety input/output terminations. Each type is available in 24V dc or 85...253V ac for supply sources.
| Cat. No. | Operating Voltage Range | Input Voltage, Max. | Input Power Entry | Power Supply Output Power (W)⋆ | Power Supply Input Power | Power Dissipation | Protections Class |
| 1797-PS1N | 85…250V AC 120…250V DC |
250V AC | 1 in NPT, £ 6 in conduit allowed between power supply and seal (UL and C-UL) | 34 W | 55 W | 21 W | IP 66/NEMA 7B |
| 1797-PS1E | 85…253V AC | 253V AC | Increased safety | 34 W | 55 W | 21 W | IP 65/NEMA 7B |
| 1797-PS2N2 | 19…32V DC | 40V DC | 1 in NPT, 6 in conduit allowed between power supply and seal (UL and C-UL) 1 in NPT, 0 in conduit allowed between power supply and seal (FM) |
34 W | 55 W | 21 W | IP 66/NEMA 7B |
| 1797-PS2E2 | 18…32V DC | 40V DC | Increased safety | 34 W | 55 W | 21 W | IP 65/NEMA 7B |
| ⋆ 8.5 W at each of 4 outputs. | |||||||
Certifications
| Cat. No. | Certifications⋆ |
| 1797-PS1N | UL, C-UL: Class I Division 1 Groups A...D Class II Division 1 Groups E, F, G; Class III FM: Mounting - Class I Division 1 Groups B...D T4 IS Power - Class I Division 1 Groups A...D T4 Class I Zone 1 AEx [ib] IIC |
| 1797-PS1E | CENELEC: Series A - EEx de [ib] IIC T4 Series B - II 2G EEx de [ib] IIC T4 II 3D IP54 T90 °C INMETRO: BR-Ex ib IIB/IIC T4 |
| 1797-PS2N2 | UL, C-UL: Class I Division 1 Groups A...D Class II Division 1 Groups E, F, G; Class III FM: Mounting - Class I Division 1 Groups B...D T4 IS Power - Class I Division 1 Groups A...D T4 Class I Zone 1 AEx [ib] IIC |
| 1797-PS2E2 | CENELEC: II 2G EEx de [ib] IIC T4 II 3D IP54 T90 °C INMETRO: BR-Ex ib IIB/IIC T4 |
| ⋆ See the Product Certification link at http://www.ab.com for declarations of Conformity, Certificates, and other certification details. For additional certification information, see the FLEX Ex System Certification manual, publication 1797-6.5.6. | |
Accessory Products
Extender Cables
| Cat. No. | Description | |
| 1797-CE1S | FLEX Ex Bus Isolator Extender Cable, 0.3 m (1 ft) | Connects a bus isolator inside an explosion-proof or purged enclosure to a Flexbus feed-through connector. |
| 1797-CE3S | FLEX Ex Bus Isolator Extender Cable, 0.9 m (3 ft) | Connects a bus isolator inside an explosion-proof or purged enclosure to a Flexbus feed-through connector. |
| 1794-CE1 | FLEX I/O 1 ft Extender Cable, 0.3 m (1 ft) | Connects two rows of FLEX Ex modules. |
| 1794-CE3 | FLEX I/O 3 ft Extender Cable, 0.9 m (3 ft) | Connects two rows of FLEX Ex modules. |
Taps and Terminators
| Cat. No. | Description | |
| 1797-TPS | ControlNet Ex Straight T-Tap | For a ControlNet Ex coax segment in a hazardous location. |
| 1797-TPR | ControlNet Ex Right-Angle T-Tap | For a ControlNet Ex coax segment in a hazardous location. |
| 1797-TPYS | ControlNet Ex Straight Y-Tap | For a ControlNet Ex coax segment in a hazardous location. |
| 1797-TPYR | ControlNet Ex Right-Angle Y-Tap | For a ControlNet Ex coax segment in a hazardous location. |
| 1797-XT | ControlNet Ex 75W Terminator | For a ControlNet Ex coax segment in a hazardous location. (Qty. 50) |
| 1797-TCAP | ControlNet Tap Terminator | Capacitor terminator for a ControlNet Ex coax tap in a hazardous location. (Qty. 5) |
ControlNet Ex Products
| Cat. No. | Description | |
| 1797-BOOT | ControlNet Ex BNC Boot | Boots to insulate ControlNet BNC connectors in the hazardous location. (Qty. 50) |
| 1797-INS | ControlNet Ex Trunk Insulators Kit | A set of 5 different types of ControlNet insulators (including a BNC boot) for a hazardous location. |
| 1797-EXMK | FLEX Ex Cable Marking Kit | Used to tag the ControlNet cable in the hazardous area as carrying IS signals. |