1794 FLEX and 1797 FLEX Ex I/O
1794 FLEX and 1797 FLEX Ex I/O Modules
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The FlexLogix controller adds control to the flexible, low-cost, modular FLEX I/O system. Use FlexLogix controllers to meet the needs of your distributed and stand-alone applications.
When planning I/O communications, consider:
- which FLEX I/O modules to use.
- where to place FLEX I/O modules.
- how FLEX I/O modules operate.
The FlexLogix controller supports FLEX and FLEX Ex I/O modules. FLEX and FLEX Ex I/O modules are packaged I/O modules that plug into terminal bases. The terminal base makes the backplane and provides the terminal connection points for wiring the I/O module.
| This family of I/O modules | Provides |
| FLEX I/O | FLEX I/O builds an I/O interface onto a terminal strip. Use the terminal strip on the terminal base to wire field devices directly. |
| FLEX Ex I/O | FLEX Ex adds galvanic isolation to the modularity of FLEX I/O. Dual-fault, intrinsically-safe circuits let you install I/O or connect to field devices in a hazardous area while maintaining a high degree of safety. |
Important: If you use FLEX Ex I/O modules, only connect the intrinsically-safe I/O modules to other intrinsically-safe apparatus to maintain the integrity of the intrinsically-safe system.
Do not mix regular FLEX I/O and FLEX Ex I/O on the same ControlNet network segment. You must separate the modules on different ControlNet segments using either a fiber hub (1786-RPA, 1786-RPFM and 1797-RPA, 1797-RPFM) or a ControlNet coax barrier (1797-BCNR).
You can connect FLEX Ex modules only on the local rail (not the extended-local rail) of a FlexLogix system using a 1797-BIC and 1797-CEC module pair.
1794 FLEX Digital I/O Modules
1794 FLEX Digital AC Input Modules
| Cat. No. | Number of Inputs | Voltage, On-State Input, Nom. | Operating Voltage Range | Default Signal Delay | Current, Off-State Input, Max. | Terminal Base Unit¬ | FLEXBus Current (mA) | Power Dissipation, Max. |
| 1794-IA8 | 8 | 120V AC | 85...132V AC | on = 8.6 ms off = 26.6 ms‡ |
2.9 mA | 1794-TBN, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD | 30 mA | 4.5 W @ 132V AC |
| 1794-IA8I | 8 individually isolated | 120V AC | 85...132V AC | on = 8.6 ms off = 26.6 ms‡ |
2.9 mA | 1794-TBN, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD | 30 mA | 4.5 W @ 132V AC |
| 1794-IA8K | 8 conformally coated | 120V AC | 85...132V AC | on = 8.6 ms off = 26.6 ms‡ |
2.9 mA | 1794-TBN, 1794-TB2, 1794-TB3, 1794-TB3S | 30 mA | 4.5 W @ 132V AC |
| 1794-IA16 | 16 | 120V AC | 74...132V AC | on = 7.5 ms off = 26.5 ms§ |
2.9 mA | 1794-TB3, 1794-TB3S, 1794-TBN T | 20 mA | 6.4 W @ 132V AC |
| 1794-IM8 | 8 | 220V AC | 159...264V AC | on = 7.5 ms off = 26.5 ms§ |
2.6 mA | 1794-TBN | 30 mA | 4.7 W @ 264V AC |
| ¬ Recommended terminal base is in bold text. T Auxiliary terminal strips are required when using the 1794-TBN for the 1794-OA16 and 1794-IA16. ‡ On = 8.6 ms by default. Selectable for 8.6, 9, 10, 12, 16, 24, 40, or 72 ms. Off = 26.6 ms by default. Selectable for 27, 28, 30, 34, 42, 58, or 90 ms. § On = 7.5 ms by default. Selectable for 8.6, 9, 10, 12, 16, 24.5, or 42 ms. Off = 26.5 ms by default. Selectable for 27, 28, 29, 31, 35, 44, or 60.5 ms. |
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1794 FLEX Digital AC Output Modules
| Cat. No. | Number of Outputs | Voltage, On-State Output, Nom. | Operating Voltage | Current per Output, Max. | Current per Module, Max. | Terminal Base Unit¬ | FLEXBus Current (mA) | Power Dissipation, Max. |
| 1794-OA8 | 8 | 120V AC | 85...132V AC | 750 mA @ 35 °C (95 °F) (5 mA minimum) |
4 A | 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TBKD | 80 mA | 4.1 W @ 0.5 A 6.3 W @ 0.75 A 6.3 W @ 1.0 A |
| 1794-OA8I | 8 individually isolated | 120V AC | 85...132V AC | 750 mA @ 35 °C (95 °F) (5 mA minimum) |
4 A | 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TBKD | 80 mA | 4.1 W @ 0.5 A 6.3 W @ 0.75 A 6.3 W @ 1.0 A |
| 1794-OA8K | 8 conformally coated | 120V AC | 85...132V AC | 750 mA @ 35 °C (95 °F) (5 mA minimum) |
4 A | 1794-TBNF, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN | 80 mA | 4.1 W @ 0.5 A 6.3 W @ 0.75 A 6.3 W @ 1.0 A |
| 1794-OA16 | 16 | 120V AC | 74...132V AC | 500 mA @ 35°C (95 °F) (50 mA minimum) |
4 A | 1794-TB3, 1794-TB2, 1794-TB3S, 1794-TBN, 1794-TBKDT | 80 mA | 4.7 W @ 0.5 A |
| 1794-OM8 | 8 | 220V AC | 159...264V AC | 500 mA @ 35°C (95 °F) (50 mA minimum) |
4 A | 1794-TBNF, 1794-TBN | 60 mA | 5 W @ 0.5 A |
| ¬ Recommended terminal base is in bold text. T Auxiliary terminal strips are required when using the 1794-TBN for the 1794-OA16 and 1794-IA16. |
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1794 FLEX Digital DC Input Modules
| Cat. No. | Number of Inputs | Voltage, On-State Input, Nom. | Voltage Category | Default Signal Delay | Current, Off-State Input, Max. | Terminal Base Unit¬ | FLEXBus Current (mA) | Power Dissipation, Max. |
| 1794-IB8 | 8 Sink | 24V DC | 19.2...31.2V DC | 256 ms | 1.5 mA | 1794-TB3, 1794-TB3S | 20 mA | 3.1 W @ 31.2V DC |
| 1794-IB16 | 16 Sink | 24V DC | 19.2...31.2V DC | 512 ms | 1.5 mA | 1794-TB3, 1794-TB3S | 30 mA | 6.1 W @ 31.2V DC |
| 1794-IB16D | 16 Sink | 24V DC | 19.2...31.2V DC | 512 ms | 1.5 mA | 1794-TB32, 1794-TB32S | 30 mA | 8.5 W @ 31.2V DC |
| 1794-IB16K | 16 Sink, conformally coated | 24V DC | 19.2...31.2V DC | 512 ms | 1.5 mA | 1794-TB3, 1794-TB3S | 30 mA | 6.1 W @ 31.2V DC |
| 1794-IB32 | 32 Sink, isolated in 2 groups of 16 | 24V DC | 19.2...31.2V DC | 0.25 ms | 1.5 mA | 1794-TB32, 1794-TB32S | 35 mA | 6.0 W @ 31.2V DC |
| 1794-IV16 | 16 Source | 24V DC | 19.2...31.2V DC | 256 ms | 1.5 mA | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBK | 30 mA | 5.7 W @ 31.2V DC |
| 1794-IC16 | 16 Sink | 48V DC | 30...60V DC | 256 ms | 1.5 mA | 1794-TB3, 1794-TB3S | 25 mA | 6.4 W @ 60V DC |
| ¬ Recommended terminal base is in bold text. | ||||||||
1794 FLEX Digital DC Output Modules
| Cat. No. | Number of Outputs | Voltage Category | Current per Output, Max. | Current per Module, Max. | Terminal Base Unit¬ | FLEXBus Current (mA) | External DC Supply Current, Nom. | Power Dissipation, Max. |
| 1794-OB8 | 8 Source | 19.2...31.2V DC | 500 mA | 4 A | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD | 60 mA | 25 mA @ 24V DC | 3.3 W @ 31.2V DC |
| 1794-OB8EP | 8 Source, electronically fused | 19.2...31.2V DC | 2 A | 10 A | 1794-TB3, 1794-TB2, 1794-TB3S, 1794-TBN, 1794-TBKD | 73 mA | 80 mA @ 24V DC | 5.5 W @ 31.2V DC |
| 1794-OB8EPK | 8 Source, electronically fused, conformally coated | 19.2...31.2V DC | 2 A | 10 A | 1794-TB3, 1794-TB2, 1794-TB3S, 1794-TBN | 73 mA | 80 mA @ 24V DC | 5.5 W @ 31.2V DC |
| 1794-OB16 | 16 Source | 19.2...31.2V DC | 500 mA | 8 A | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD | 80 mA | 49 mA @ 24V DC | 5.3 W @ 31.2V DC |
| 1794-OB16D | 16 Source | 19.2...31.2V DC | 500 mA | 8 A | 1794-TB3, 1794-TB3S, 1794-TBKD | 60 mA | — | 4.8 W @ 31.2V DC |
| 1794-OB16P | 16 Source, protected | 19.2...31.2V DC | 500 mA | 8 A | 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD | 60 mA | 60 mA @ 24V DC | 5.0 W @ 31.2V DC |
| 1794-OB16PK | 16 Source, protected, conformally | 19.2...31.2V DC | 500 mA | 8 A | 1794-TB2, 1794-TB3, 1794-TB3S | 60 mA | 60 mA @ 24V DC | 5.0 W @ 31.2V DC |
| 1794-OB32P | 32 Source, protected, isolated in 2 groups of 16 | 31.2V DC | 500 mA | 14 A | 1794-TB32, 1794-TB32S | 80 mA | 215 mA @ 24V DC | 5.3 W @ 31.2V DC |
| 1794-OV16 | 16 Sink | 19.2...31.2V DC | 500 mA | 8 A | 1794-TB3, 1794-TB3S | 80 mA | 60 mA @ 24V DC | 4.2W @ 31.2V DC |
| 1794-OV16P | 16 Sink, protected | 19.2...31.2V DC | 500 mA | 8 A | 1794-TB3, 1794-TB3S | 80 mA | 49 mA @ 24V DC | 4.2 W @ 31.2V DC |
| 1794-OC16 | 16 Source | 30...60V DC | 500 mA | 8 A | 1794-TB3, 1794-TB2, 1794-TB3S, 1794-TBKD | 80 mA | 21 mA @ 24V DC | 3.7 W @ 60V DC |
| ¬ Recommended terminal base is in bold text. | ||||||||
1794 FLEX Digital DC Combination Input/Output Modules
| Cat. No. | Inputs |
Outputs |
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| Number of Inputs | Voltage, On-State Input, Nom. | Voltage Category | Default Signal Delay | Current, Off-State Input, Max. | Number of Outputs | Current per Output, Max. | Terminal Base Unit¬ | FLEXBus Current (mA) | External DC Supply Voltage, Nom. | Power Dissipation, Max. | |
| 1794-IB10XOB6 | 10 Sink | 24V DC | 19.2...31.2V DC | 0.25 ms | 1.5 mA | 6 Source | 200 mA | 1794-TB3, 1794-TB3S | 35 mA | 19 mA @ 24V DC | 6.0 W @ 31.2V DC |
| 1794-IB16XOB16P | 16 Sink | 24V DC | 10...31.2V DC | 0.25 ms | 1.5 mA | 16 Source, protected | 500 mA | 1794-TB32, TB32S | 80 mA | 28 mA @ 24V DC | 7.0 W @ 31.2V DC |
| ¬ Recommended terminal base is in bold text. | |||||||||||
1794 FLEX Digital Contact Output Modules
| Cat. No. | Number of Outputs | Voltage Category | Current per Output, Max. | Current per Module, Max. | Terminal Base Unit¬ | FLEXBus Current (mA) | External DC Supply Current Range | Power Dissipation, Max. |
| 1794-OW8 | 8 individually isolated, N.O. relay contact | 5…240V DC | 3 A @ 250V AC resistive | 16 A | 1794-TBNF, 1794-TBN, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBKD | 70 mA | 125 mA, max | 5.5 W @ 31.2V DC |
| ¬ Recommended terminal base is in bold text. | ||||||||
1794 FLEX Analog I/O Modules
| Cat. No. | Number of Inputs | Number of Outputs | Signal Range | Terminal Base Unit | FLEXBus Current (mA) | External DC Supply Current, Nom. | Power Dissipation, Max. |
| 1794-IE4XOE2 | 4 single-ended | 2 single-ended | 4…20 mA 0…20 mA ±10V 0…10V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS¬ | 20 mA | 70 mA @ 24V DC | 4.0 W @ 31.2V DC |
| 1794-IE8XOE4 | 8 single-ended | 4 single-ended | 4…20 mA (user configurable) 0…20 mA (user configurable) |
1794-TB3G or 1794-TB3GS | 80 mA | 140 mA @ 24V DC; 280 mA @ 10.0V DC | 3.0 W @ 31.2V DC; 2.3 W @ 24V DC; 2.0 W @ 10.0V DC |
| 1794-IF2XOF2I | 2 isolated | 2 isolated | 4…20 mA 0…20 mA ±20 mA ±10V 0…10V ±5V 0…5V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN¬ | 50 mA | 150 mA @ 24V DC | 3.3 W @ 31.2V DC |
| 1794-IE8 | 8 single-ended | — | 4…20 mA 0…20 mA ±10V 0…10V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS¬ | 20 mA | 60 mA @ 24V DC | 3 W @ 31.2V DC |
| 1794-IE8H | 8 single-ended, HART interface | — | 4…20 mA | 1794-TB3G or 1794-TB3GS | — | 295 mA @ 24V DC | 3.9 W |
| 1794-IE8K | 8 single-ended, conformally coated | — | 4…20 mA 0…20 mA ±10V 0…10V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS¬ | 20 mA | 60 mA @ 24V DC | 3 W @ 31.2V DC |
| 1794-IE12 | 12 single-ended | — | 4…20 mA (user configurable) 0…20 mA (user configurable) |
1794-TB3G or 1794-TB3GS | 80 mA | 30 mA @ 24V DC; 45 mA @ 10.0V DC | 1.2 W @ 31.2V DC; 1.1 W @ 24V DC; 0.9 W @ 10.0V DC |
| 1794-IF4I | 4 isolated | — | 4…20 mA 0…20 mA ±20 mA ±10V 0…10V ±5V 0…5V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN¬ | 50 mA | 80 mA @ 24V DC | 2.0 W @ 31.2V DC |
| 1794-IR8 | 8 single-ended, RTD | — | 1…433 W | 1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS¬ | 20 mA | 140 mA @ 24V DC | 3 W @ 31.2V DC |
| 1794-IRT8 | 8 single-ended, thermocouple or RTD | — | -40…+100 mV DC for thermocouples 0…325 mV DC for RTDs 0…500 W for resistance range |
1794-TB3G, 1794-TB3GS¬ | 40 mA | 85 mA @ 24V DC | 3 W @ 31.2V DC |
| 1794-IRT8K | 8 single-ended, thermocouple or RTD, conformally coated | — | -40…+100 mV DC for thermocouples 0…325 mV DC for RTDs 0…500 W for resistance range |
1794-TB3G, 1794-TB3GS¬ | 40 mA | 85 mA @ 24V DC | 3 W @ 31.2V DC |
| 1794-IT8 | 8 single-ended, thermocouple | — | ±76.5 mV | 1794-TB3T, 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3TS¬ T | 20 mA | 150 mA @ 24V DC | 3 W @ 31.2V DC |
| 1794-OE4 | — | 4 single-ended | 4…20 mA 0…20 mA ±10V 0…10V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN¬ | 20 mA | 70 mA @ 24V DC‡ | 4.5 W @ 31.2V DC |
| 1794-OE4K | — | 4 single-ended, conformally coated | 4…20 mA 0…20 mA ±10V 0…10V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN¬ | 20 mA | 70 mA @ 24V DC‡ | 4.5 W @ 31.2V DC |
| 1794-OE8H | — | 4 single-ended, HART interface | 4…20 mA 0…20 mA |
1794-TB3G or 1794-TB3GS | — | 255 mA @ 24V DC | 6.1 W |
| 1794-OE12 | — | 12 single-ended | 4…20 mA 0…20 mA |
1794-TB3G or 1794-TB3GS | 80 mA | 320 mA @ 24V DC; 720 mA @ 10.0V DC | 4.0 W @ 31.2V DC; 4.3 W @ 24V DC; 4.0 W @ 10.0V DC |
| 1794-OF4I | — | 4 isolated | 4…20 mA 0…20 mA ±10V 0…10V ±5V 0…5V |
1794-TB3, 1794-TB2, 1794-TB3S, 1794-TB3T, 1794-TB3TS, 1794-TBN¬ | 50 mA | 210 mA @ 24V DC | 4.7 W @ 31.2V DC |
| ¬ Recommended terminal base is in bold text. T You can use a 1794-TB2, 1794-TB3, or 1794-TB3S for mV inputs only. ‡ Not including outputs. |
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1794 FLEX Counter Modules
| Cat. No. | Number of Inputs | Number of Outputs | Input Frequency, Max. | Terminal Base Unit | FLEXBus Current (mA) | External DC Supply Current, Nom. | Power Dissipation, Max. |
| 1794-ID2 | 2 , 2 groups of A, B, Z, G inputs | — | 100 | 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TBNFT ‡ | 5 mA@ 5V dc | 150 mA @ 12V DC 75 mA @ 24V DC |
5 W @ 26.4V DC |
| 1794-IJ2 | 2 counters, each with 2 digital inputs | 2 counters, each with 1 digital output | 1…32 kHz w/sine wave; 1…32 kHz w/square wave input | 1794-TB3G, 1794-TB3GST | 30 mA | 220 mA @ 19.2V DC; 180 mA @ 24V DC; 140 mA @ 31.2V DC | 4.6 W @ 31.2V DC |
| 1794-IJ2K | 2 counters, each with 2 digital inputs, conformally coated | 2 counters, each with 1 digital output | — | — | — mA | — | — |
| 1794-IP4 | 4 pulse counters, each with 2 inputs | — | 100 | 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TBNFT ‡ | 5 mA | 150 mA @ 12V DC 75 mA @ 24V DC |
5 W @ 26.4V DC |
| 1794-VHSC¬ | 2 counters, each with digital inputs | 2 channels, each with 1 digital output | 1.0 MHz counter and encoder X1 (no filters) 500 kHz encoder X2 (no filters) 250 kHz encoder X4 (no filters) |
1794-TB3G, 1794-TB3GST § T | 75 mA§ | 100 mA @ 24V DC Does not represent power required to supply the inputs or outputs. |
5 W @ 31.2V DC |
| ¬ As of firmware revision 11, you can install the 1794-VHSC module (and any other module that uses extended data transfers) on the local or extended-local DIN rails of a FlexLogix system. Previous revisions of the controller firmware support these modules only as remote ControlNet I/O. T Recommended terminal base is in bold text. ‡ Auxiliary terminal strips are required when using the 1794-TBN or 1794-TBNF for this catalog number. § For use with 1794-ACN15, 1794-ANCR15, and 1794-AENT only. § FLEXBus Current = 75 mA with terminal base power off. |
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1797 FLEX Ex Digital I/O Modules
1797 FLEX Ex Digital DC Input Modules
| Cat. No. | Number of Inputs | Voltage, On-State Input, Nom. | Voltage Category | Default Signal Delay | Current, Off-State Input, Max. | Terminal Base Unit | Power Consumption (W) at 24V | Power Dissipation, Max. |
| 1797-IBN16 | 16 Sink | NAMUR compatible | NAMUR compatible dc | 1 ms | 1.2 mA | 1797-TB3, 1797-TB3S | 2.8 | 2.8 W |
1797 FLEX Ex Digital DC Output Modules
| Cat. No. | Number of Outputs | Voltage Category | Maximum Current per Output | Maximum Current per Module | Terminal Base Unit | Power Consumption (W) at 24V | Power Dissipation, Max. |
| 1797-OB4D | 4 Source | 24V DC | 45 mA | 180 mA | 1797-TB3, 1797-TB3S | 7.5 | 5 W |
1797 FLEX Ex Analog I/O Modules
| Cat. No. | Number of Inputs | Number of Outputs | Input Signal Range | Terminal Base Unit | Power Consumption (W) at 24V | Power Dissipation |
| 1797-IE8 | 8 single-ended | — | 0…20 mA | 1797-TB3, 1797-TB3S | 7.5 | 5.2 W |
| 1797-IE8H | 8 single-ended, HART | — | 0...20 mA 4...20 mA |
1797-TB3 or -TB3S | 7.5 | 5.2 W |
| 1797-IE8NF | 8 single-ended, noise filter | — | 0…20 mA | 1797-TB3, 1797-TB3S | 7.5 | 5.2 W |
| 1797-IRT8 | 8 single-ended, thermocouple or RTD | — | 0…500 W -40…100 mV TC RTD |
1797-TB3, 1797-TB3S | 1.6 | 1.6 W |
| 1797-OE8 | — | 8 single-ended | — | 1797-TB3, 1797-TB3S | 6.3 | 5.4 W |
| 1797-OE8H | — | 8 single-ended, HART | — | 1797-TB3 or -TB3S | 6.3 | 5.4 W |
1797 FLEX Counter Modules
| Cat. No. | Number of Inputs | Number of Outputs | Input Frequency, Max. | Terminal Base Unit | Power Consumption (W) at 24V | Power Dissipation, Max. |
| 1797-IJ2 | 2 channels, each with 2 digital NAMUR inputs | 2 channels, each with 1 digital output | 1.0 Hz...32,767 Hz | 1797-TB3, 1797-TB3S | 4.25 | 4.25 W |