1791D CompactBlock I/O
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CompactBlock I/O
CompactBlock I/O is ideal for applications restricted by space limitations and applications requiring highly distributed I/O blocks close to sensors and actuators. CompactBlock I/O supports the DeviceNet network. Up to 32 points can be addressed on a single network node. Local control is accomplished through DeviceLogix™ Smart Component Technology.
Benefits
- Compact size fits into shallow enclosures and confined areas.
- Built-in DeviceNet adapter.
- DeviceLogix™ Smart Component Technology enables localized, simple control functions for faster sense-to-actuation time.
- Higher environmental specifications compared to 1790 CompactBlock LDX I/O blocks expands application range.
- IEC/NEMA Type 3+ inputs offer the widest range of compatible sensors.
- Removable terminal strips make it easy to replace an I/O block without rewiring.
- Node address switches and autobaud ease network commissioning.
- Cyclic and change-of-state DeviceNet operation improves network throughput by reducing network bandwidth usage.
- Selectable input filters let you select off-to-on and on-to-off delays best suited for your application.
- Output short-circuit protection protects outputs against accidental miswiring.
Product Design
CompactBlock I/O blocks are available as either base blocks or expansion blocks. The base blocks contain a maximum of 16 digital I/O, as well as a built-in DeviceNet network adapter and DeviceLogix Smart Component Technology.
A CompactBlock I/O expansion block contains 16 digital I/O or 4 in/2 out of analog points and connects to a base block through a ribbon cable. You can add one expansion block to a CompactBlock I/O base block for up to 32 I/O points per node. Expansion blocks are compatible with all base blocks. An expansion block cannot be used alone.
The DeviceNet network supplies power to DeviceNet base blocks and expansion blocks. Inputs and outputs are powered by an external 24V DC source that is independent of the network.
Removable terminal strips on CompactBlock I/O make it easy to replace an I/O block without rewiring. The I/O blocks can be mounted on a panel or DIN rail in virtually any orientation.
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| Possible configurations for CompactBlock I/O modules on a DeviceNet I/O network. Each base module supports one expansion module. | The CompactBlock I/O modules contain a removable terminal block that allows for easy module replacement without rewiring. Removable terminal blocks on all modules are easy to maintain and help reduce downtime. |
Communication
A CompactBlock I/O base block has a built-in DeviceNet I/O adapter port that interfaces the I/O with a network link to communicate with a scanner port for a programmable controller processor.
Typical Configuration
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Specifications
General Specifications
| Enclosure Type Rating | Meets IP20 |
| Mounting Type | DIN-rail, Panel |
| Operating Temperature | 0…60 °C (32…140 °F) |
| Nonoperating Temperature | -40…85 °C (-40…185 °F) |
| Relative Humidity | 5…95% noncondensing |
| Operating Shock | 30 g |
| Nonoperating Shock | 50 g |
| Vibration | 5 g at 10…500 Hz |
| Certifications⋆ | UL, c-UL-us Class I Div 2 Hazardous, CE, C-Tick, ODVA |
| ⋆ When product is marked. See the Product Certification link at http://ab.rockwellautomation.com for declarations of Conformity, Certificates, and other certification details. | |
Dimensions and Weights
| Description | Dimensions (HxWxD), Approx. | Weight |
| Base Blocks | 50 x 150 x 38 mm (1.97 x 5.91 x 1.5 in) | 0.2 kg (0.4 lb) |
| Expansion Blocks | 50 x 115 x 38 mm (1.97 x 4.4 x 1.5 in) | 0.1 kg (0.3 lb) |
Digital I/O Base Blocks
- Built-in DeviceNet (1791D) I/O adapter with up to 16 I/O points.
- DeviceLogix Smart Component Technology.
- Each base block supports one digital or analog CompactBlock expansion block.
- Removable screw-clamp terminal strips.
Digital DC Input Base Blocks
| Cat. No. | 1791D-16B0 | 1791D-16V0 |
| Termination Type | Screw-clamp | |
| Number of Inputs | 16 current sinking, Non-isolated (2 groups of 8) | 16 current sourcing, Non-isolated (2 groups of 8) |
| Voltage, On-State Input, Nom. | 24V DC | |
| Voltage Range, On-State Input | 10…30V DC⋆ | |
| Current, Off-State Input, Max. | 1.5 mA | |
| Network Adapter | DeviceNet | |
| Network Current Load | 200 mA | |
| Power Dissipation, Max. | 7.48 W | |
| ⋆ Max voltage at 40 °C; 25V DC at 60 °C. |
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Digital DC Output Base Blocks
Outputs are electronically protected.
| Cat. No. | 1791D-0B16P | 1791D-0V16P |
| Termination Type | Screw-clamp | |
| Number of Outputs | 16 current sourcing, Non-isolated (2 groups of 8) | 16 current sinking, Non-isolated (2 groups of 8) |
| Voltage, On-State Output, Nom. | 24V DC | |
| Voltage Range, On-State Output | 10…30V DC | |
| Current, On-State Output, Max. | 0.5 A | |
| Network Adapter | DeviceNet | |
| Network Current Load | 200 mA | |
Digital DC Combination Base Blocks
Outputs are electronically protected.
| Cat. No. | 1791D-8B8P | 1791D-8V8P | |
| Termination Type | Screw-clamp | ||
| Inputs | |||
| Number of Inputs | 8 current sinking, Non-isolated (1 group of 8) | 8 current sourcing, Non-isolated (1 group of 8) | |
| Voltage, On-State Input, Nom. | 24V DC | ||
| Voltage Range, On-State Input | 10…30V DC⋆ | ||
| Current, Off-State Input, Max. | 1.5 mA | ||
| Outputs | |||
| Number of Outputs | 8 current sourcing, Non-isolated (1 group of 8) | 8 current sinking, Non-isolated (1 group of 8) | |
| Voltage, On-State Output, Nom. | 24V DC | ||
| Voltage Range, On-State Output | 10…30V DC | ||
| Current, On-State Output, Max. | 0.5 A | ||
| Network Adapter | DeviceNet | ||
| Network Current Load | 200 mA | ||
| ⋆ Max voltage at 40 °C; 25V DC at 60 °C. | |||
Digital I/O Expansion Blocks
- You can add one CompactBlock digital I/O expansion block to any CompactBlock base block to expand the I/O assembly to up to 32 I/O points. An expansion block cannot be used alone.
- Each block ships with a 4-cm ribbon cable to connect it to the base block. An optional 15-cm ribbon cable is available.
- Removable screw-clamp terminal strips.
Digital DC Input Expansion Blocks
| Cat. No. | 1791D-16B0X | 1791D-16V0X |
| Termination Type | Screw-clamp | Screw-clamp |
| Number of Inputs | 16 current sinking, Non-isolated (2 groups of 8) | 16 current sourcing, Non-isolated (2 groups of 8) |
| Voltage, On-State Input, Nom. | 24V DC | |
| Voltage Range, On-State Input | 10…30V DC⋆ | |
| Current, Off-State Input, Max. | 1.5 mA | |
| ⋆ Max voltage at 40 °C; 25V DC at 60 °C. | ||
Digital DC Output Expansion Blocks
Outputs are electronically protected.
| Cat. No. | 1791D-0B16PX | 1791D-0V16PX |
| Termination Type | Screw-clamp | Screw-clamp |
| Number of Outputs | 16 current sourcing, Non-isolated (2 groups of 8) | 16 current sinking, Non-isolated (2 groups of 8) |
| Voltage, On-State Output, Nom.Voltage, On-State Output, Nom. | 24V DC | |
| Voltage Range, On-State Output | 10…30V DC | |
| Current, On-State Output, Max.Current, On-State Output, Max. | 0.5 A | |
Analog I/O Expansion Blocks
- You can add one CompactBlock analog I/O expansion block to any CompactBlock base block. An expansion block cannot be used alone.
- Each block ships with a 4-cm ribbon cable to connect it to the base block. An optional 15-cm ribbon cable is available.
- Removable screw-clamp terminal strips.
- Data Format: 12-bit integer.
| Cat. No. | 1791D-N4CV2X |
| Termination Type | Screw-clamp |
| Number of Inputs/Outputs | 4 single-ended inputs; 2 single-ended outputs |
| Signal Range (Inputs and Outputs) | 0…24 mA 0…20 mA 0…10V |
| Input Update Rate, per Module | 100 ms per channel at notch = 60 Hz |
| Input Resolution | 12-bits |
| Overall Accuracy | Current Input: ±0.25% of Full Scale Voltage Input: ±0.25% of Full Scale Current Output: ±0.2% of Full Scale Voltage Output: ±0.2% of Full Scale |
| External Power Required | 100 mA at 24V DC |
Accessory Products
DeviceNet Communication Cable Assemblies
| Cat. No. | Description | Length (m) | Connector Shell Type |
| 1485K-P1F5-C | Unshielded DeviceNet drop cable assembly with micro-male connector for connection to a flat trunk cable | 1 | aluminum |
| 1485K-P6F5-C | 6 | aluminum | |
| 1485R-P1M5-C | Shielded DeviceNet drop cable assembly with mini-male connector for connection to a round trunk cable | 1 | aluminum |
| 1485RS-P1M5-C | stainless steel | ||
| 1485R-P2M5-C | Shielded DeviceNet drop cable assembly with mini-male connector for connection to a round trunk cable | 2 | aluminum |
| 1485RS-P2M5-C | stainless steel | ||
| 1485R-P3M5-C | Shielded DeviceNet drop cable assembly with mini-male connector for connection to a round trunk cable | 3 | aluminum |
| 1485RS-P3M5-C | stainless steel | ||
| Note: You can also use a cable section with no connectors. | |||
Cables and Connectors
| Cat. No. | Description | Qty per Package |
| 1791D-4CMCBL | 24V DC block I/O replacement ribbon cable, 4 cm | 5 |
| 1791D-15CMCBL | 24V DC block I/O longer ribbon cable, 15 cm | 5 |
| 1791D-30CMCBL | 24V DC block I/O long ribbon cable, 30 cm | 5 |
| 1791D-RTBN21 | Block I/O replacement terminal block, 21-pin NEMA | 1 |
| 1787-PLUG10R | Connector for daisy-chaining a DeviceNet drop cable | 1 |
DeviceNet Straight 5-pin Open Plug to 5-pin Micro Male Connector
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The DeviceNet straight 5-pin open plug to 5-pin micro male connector can be used in place of the 5-position open style plugs for DeviceNet, making it easier to connect I/O modules to the network, as well as reducing potential for miswiring and saving wiring time.
The DeviceNet straight 5-pin open plug to 5-pin micro male connector is compatible with:
- 1734D POINTBlock I/O
- 1790 CompactBlock LDX I/O
- 1791D CompactBlock I/O
- 1794-ADN FLEX I/O DeviceNet adapter
- 1799 Embedded I/O
| Cat. No. | Description |
| 1799-DNC5MMS | Female Open-style DeviceNet Y Adapter (Qty. 5) |
| 1799-DNC100MMS | DeviceNet straight 5-pin open plug to 5-pin micro male connector (Qty. 100) |