Allen-Bradley 1794-TBN I/O Terminal Base Unit
The Allen-Bradley 1794-TBN, also cataloged as the 1794-TBN Terminal Base Unit, operates as a dedicated hardware component for field wiring termination and backplane signal routing within Flex I/O 1794 system architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TBN |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.56 lbs (0.26 kg) |
| Dimensions | Standard Flex I/O Terminal Base Footprint |
| Operating Temp | -20 to 70 deg C |
| Storage Temp | -40 to 85 deg C |
| Relative Humidity | 5 to 95% (non-condensing) |
| Power Consumption | Host backplane bus powered |
| I/O Capacity | 16 I/O Points |
| Common Terminals | 2 Common Terminals |
| Voltage Rating | 250 VAC/DC max |
| Isolation Voltage | 250 V continuous |
| Maximum Current Rating | 10 A |
| Terminal Screw Torque | 1.4 Nm (12 lb-in) |
| Wire Size Range | 22 to 12 AWG (0.34 to 2.5 mm2) |
| Operating Frequency | 50 to 60 Hz |
Deterministic Network Communication & I/O Density
The 1794-TBN terminal base unit provides the physical wiring matrix and internal backplane bus interconnectivity for 16-point Flex I/O modules, supporting high-density I/O scaling across distributed EtherNet/IP, ControlNet, or Profinet networks. Internal bus connectors transmit power and control signals deterministically to mounted modules without signal loss, while offering full firmware flash compatibility across standard 1794 series adapter combinations. Integrated channel separation and continuous 250 V isolation ensure high backplane bus communication velocity and signal integrity during fast switching events.
Frequently Asked Questions
Q: What is the maximum current capacity per terminal on the 1794-TBN base unit?
A: The 1794-TBN features a total maximum current rating of 10 A across its common/power bus terminals, supporting field device distribution up to 250 VAC/DC operational limits.
Q: Are 1794 Flex I/O modules hot-swappable when mounted on the 1794-TBN terminal base?
A: Yes. The 1794-TBN allows Removal and Insertion Under Power (RIUP), enabling I/O module replacement without disturbing field wiring or interrupting backplane communication on adjacent base units.
Q: What screw torque specification should be applied to the NEMA-style terminal block screws?
A: All field wiring terminal screws on the 1794-TBN must be torqued to exactly 1.4 Nm (12 lb-in) to maintain solid physical contact and prevent connection resistance degradation.
Field Installation Guidelines
- Mount the 1794-TBN securely onto a standard 35 mm DIN rail or directly to a backpanel using the integrated mounting feet.
- Lock adjacent terminal base units together using the side-locking keyways to ensure proper backplane bus pin engagement.
- Strip field conductors to specified lengths and secure 22 to 12 AWG copper wire to the cage-clamp terminals, torquing screws to 1.4 Nm.
- Connect power and common distribution lines to the designated common terminals to maintain balanced voltage potential across all 16 I/O channels.
- Ensure the overall control enclosure maintains ambient temperatures between -20 deg C and 70 deg C to preserve terminal insulation ratings.
Allen-Bradley 1794-TBN I/O Terminal Base Unit
Allen-Bradley 1794-TBN I/O Terminal Base Unit
The Allen-Bradley 1794-TBN, also cataloged as the 1794-TBN Terminal Base Unit, operates as a dedicated hardware component for field wiring termination and backplane signal routing within Flex I/O 1794 system architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TBN |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.56 lbs (0.26 kg) |
| Dimensions | Standard Flex I/O Terminal Base Footprint |
| Operating Temp | -20 to 70 deg C |
| Storage Temp | -40 to 85 deg C |
| Relative Humidity | 5 to 95% (non-condensing) |
| Power Consumption | Host backplane bus powered |
| I/O Capacity | 16 I/O Points |
| Common Terminals | 2 Common Terminals |
| Voltage Rating | 250 VAC/DC max |
| Isolation Voltage | 250 V continuous |
| Maximum Current Rating | 10 A |
| Terminal Screw Torque | 1.4 Nm (12 lb-in) |
| Wire Size Range | 22 to 12 AWG (0.34 to 2.5 mm2) |
| Operating Frequency | 50 to 60 Hz |
Deterministic Network Communication & I/O Density
The 1794-TBN terminal base unit provides the physical wiring matrix and internal backplane bus interconnectivity for 16-point Flex I/O modules, supporting high-density I/O scaling across distributed EtherNet/IP, ControlNet, or Profinet networks. Internal bus connectors transmit power and control signals deterministically to mounted modules without signal loss, while offering full firmware flash compatibility across standard 1794 series adapter combinations. Integrated channel separation and continuous 250 V isolation ensure high backplane bus communication velocity and signal integrity during fast switching events.
Frequently Asked Questions
Q: What is the maximum current capacity per terminal on the 1794-TBN base unit?
A: The 1794-TBN features a total maximum current rating of 10 A across its common/power bus terminals, supporting field device distribution up to 250 VAC/DC operational limits.
Q: Are 1794 Flex I/O modules hot-swappable when mounted on the 1794-TBN terminal base?
A: Yes. The 1794-TBN allows Removal and Insertion Under Power (RIUP), enabling I/O module replacement without disturbing field wiring or interrupting backplane communication on adjacent base units.
Q: What screw torque specification should be applied to the NEMA-style terminal block screws?
A: All field wiring terminal screws on the 1794-TBN must be torqued to exactly 1.4 Nm (12 lb-in) to maintain solid physical contact and prevent connection resistance degradation.
Field Installation Guidelines
- Mount the 1794-TBN securely onto a standard 35 mm DIN rail or directly to a backpanel using the integrated mounting feet.
- Lock adjacent terminal base units together using the side-locking keyways to ensure proper backplane bus pin engagement.
- Strip field conductors to specified lengths and secure 22 to 12 AWG copper wire to the cage-clamp terminals, torquing screws to 1.4 Nm.
- Connect power and common distribution lines to the designated common terminals to maintain balanced voltage potential across all 16 I/O channels.
- Ensure the overall control enclosure maintains ambient temperatures between -20 deg C and 70 deg C to preserve terminal insulation ratings.
