Allen-Bradley 1794-TB32 Terminal Base Unit
The Allen-Bradley 1794-TB32, also cataloged as the 1794-TB32 Terminal Base Unit, operates as a dedicated hardware component for high-density field signal termination and backplane power distribution within Flex I/O 1794 control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TB32 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.75 lbs (0.34 kg) |
| Dimensions | Standard Flex I/O Terminal Base Footprint |
| Operating Temp | -20 to 70 deg C |
| Power Consumption | 640 mA max (Flexbus output power) |
| Voltage Rating | 24 VDC |
| Input Voltage Range | 19.2 to 31.2 VDC |
| Max Current Rating | 10 A |
| Isolation Voltage | 50 V continuous |
| Termination Type | Cage Clamp |
| Field Connections | 32 I/O, 8 Common, 8 +V Terminals |
| Communication Rate | 57.6 kbps to 230 kbps |
Deterministic Network Communication & I/O Density
The 1794-TB32 provides a high-density 32-channel signal interface supporting high I/O density scaling across distributed EtherNet/IP and ControlNet topologies. Integrated internal backplane routing ensures stable backplane bus communication velocity and continuous Flexbus current delivery up to 640 mA to mounted I/O modules. Firmware flash compatibility across standard 1794 series network adapters allows deterministic parameter pass-through and communication rates up to 230 kbps, maintaining channel-to-channel signal integrity and fast update execution across all 32 cage-clamp termination points.
Frequently Asked Questions
Q: How are power and ground distributed across the field terminals on the 1794-TB32?
A: The terminal base unit features 32 distinct I/O termination points alongside 8 common terminals and 8 +V power distribution terminals, allowing direct cage-clamp termination for 32-point 24 VDC I/O modules without requiring external terminal strips.
Q: Can 1794 series modules be replaced on the 1794-TB32 while the backplane is energized?
A: Yes. The 1794-TB32 supports Removal and Insertion Under Power (RIUP), allowing technicians to replace faulty 32-point I/O modules without removing field wiring or interrupting backplane communication to adjacent base units.
Q: What is the maximum continuous isolation voltage rating for the 1794-TB32 base?
A: The 1794-TB32 is rated for 50 V continuous isolation between field-side circuits and the internal Flexbus backplane logic system.
Field Installation Guidelines
- Mount the 1794-TB32 securely onto a standard 35 mm DIN rail or panel surface using the integrated mounting latches.
- Align and interconnect adjacent terminal base units using the side-locking keyways to guarantee solid physical engagement of the internal Flexbus connectors.
- Strip field conductors to recommended lengths and insert into the cage-clamp terminals, ensuring 24 VDC positive feeds connect to +V terminals and returns to common points.
- Verify that external 24 VDC field power supplies remain strictly within the 19.2 to 31.2 VDC operating window under all load conditions.
- Maintain adequate enclosure airflow to keep ambient operating temperatures within the specified -20 to 70 deg C range.
Allen-Bradley 1794-TB32 Terminal Base Unit
Allen-Bradley 1794-TB32 Terminal Base Unit
The Allen-Bradley 1794-TB32, also cataloged as the 1794-TB32 Terminal Base Unit, operates as a dedicated hardware component for high-density field signal termination and backplane power distribution within Flex I/O 1794 control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TB32 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.75 lbs (0.34 kg) |
| Dimensions | Standard Flex I/O Terminal Base Footprint |
| Operating Temp | -20 to 70 deg C |
| Power Consumption | 640 mA max (Flexbus output power) |
| Voltage Rating | 24 VDC |
| Input Voltage Range | 19.2 to 31.2 VDC |
| Max Current Rating | 10 A |
| Isolation Voltage | 50 V continuous |
| Termination Type | Cage Clamp |
| Field Connections | 32 I/O, 8 Common, 8 +V Terminals |
| Communication Rate | 57.6 kbps to 230 kbps |
Deterministic Network Communication & I/O Density
The 1794-TB32 provides a high-density 32-channel signal interface supporting high I/O density scaling across distributed EtherNet/IP and ControlNet topologies. Integrated internal backplane routing ensures stable backplane bus communication velocity and continuous Flexbus current delivery up to 640 mA to mounted I/O modules. Firmware flash compatibility across standard 1794 series network adapters allows deterministic parameter pass-through and communication rates up to 230 kbps, maintaining channel-to-channel signal integrity and fast update execution across all 32 cage-clamp termination points.
Frequently Asked Questions
Q: How are power and ground distributed across the field terminals on the 1794-TB32?
A: The terminal base unit features 32 distinct I/O termination points alongside 8 common terminals and 8 +V power distribution terminals, allowing direct cage-clamp termination for 32-point 24 VDC I/O modules without requiring external terminal strips.
Q: Can 1794 series modules be replaced on the 1794-TB32 while the backplane is energized?
A: Yes. The 1794-TB32 supports Removal and Insertion Under Power (RIUP), allowing technicians to replace faulty 32-point I/O modules without removing field wiring or interrupting backplane communication to adjacent base units.
Q: What is the maximum continuous isolation voltage rating for the 1794-TB32 base?
A: The 1794-TB32 is rated for 50 V continuous isolation between field-side circuits and the internal Flexbus backplane logic system.
Field Installation Guidelines
- Mount the 1794-TB32 securely onto a standard 35 mm DIN rail or panel surface using the integrated mounting latches.
- Align and interconnect adjacent terminal base units using the side-locking keyways to guarantee solid physical engagement of the internal Flexbus connectors.
- Strip field conductors to recommended lengths and insert into the cage-clamp terminals, ensuring 24 VDC positive feeds connect to +V terminals and returns to common points.
- Verify that external 24 VDC field power supplies remain strictly within the 19.2 to 31.2 VDC operating window under all load conditions.
- Maintain adequate enclosure airflow to keep ambient operating temperatures within the specified -20 to 70 deg C range.
