Allen-Bradley 1794-TB3T I/O Temperature Terminal Base Unit
Configured for high-density signal termination and thermocouple interfacing in Allen-Bradley Flex I/O networks, the Allen-Bradley 1794-TB3T (1794-TB3T Flex I/O Terminal Base Unit) provides direct physical/electrical execution. This 16-point terminal interface incorporates internal temperature sensing and eight dedicated chassis ground terminals to process 125 VAC/DC signals across distributed control architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TB3T |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.56 lbs (0.26 kg) |
| Dimensions | Standard Flex I/O Base Dimensions |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | Passive Component / Rated up to 125 VAC/DC |
| Maximum Current Rating | 10 A total base current |
| I/O Capacity | Up to 16 input/output points |
| Chassis Ground Terminals | 8 dedicated chassis ground terminals |
| Operating Frequency Range | 50 Hz to 60 Hz |
| Relative Humidity | 5% to 95% (non-condensing) |
| Vibration Resistance | 5 g at 10 Hz to 150 Hz |
| Compatible Module Types | Thermocouple and high-density 1794 Flex I/O modules |
EtherNet/IP Deterministic Networks & Backplane Bus Velocity
The 1794-TB3T terminal base unit establishes the physical connection layer for the Flexbus backplane, enabling high-velocity data transfer between inserted functional modules and network adapters on EtherNet/IP control networks. The board includes continuous signal route trace shielding and low-impedance bus connections, maintaining deterministic transmission times across high-density I/O clusters. Designed for extended environmental conditions (-20 to +70 deg C), the unit preserves backplane signal integrity even when subjected to 5 g mechanical vibration across the 10 Hz to 150 Hz frequency band.
Frequently Asked Questions
Q: What is the maximum voltage and current capacity supported by the 1794-TB3T terminal base?
A: The terminal base is rated for operation up to 125 VAC/DC with a maximum continuous current capacity of 10 A across the terminal array.
Q: How many dedicated ground terminals are integrated into the 1794-TB3T chassis?
A: The base unit provides eight dedicated chassis ground terminals to facilitate single-point drain wire grounding for shielded instrument cables.
Q: What operating temperature range can the 1794-TB3T withstand in field enclosures?
A: The hardware operates within an extended ambient temperature range of -20 to +70 deg C (-4 to +158 deg F).
Field Installation Guidelines
- Snap the 1794-TB3T base unit firmly onto a grounded TS35 DIN rail, ensuring the locking latch fully engages the rail.
- Interlock adjacent Flex I/O bases by sliding them laterally to complete the internal Flexbus backplane connection.
- Wire field instrumentation to the cage-clamp or screw terminals, connecting cable drain shields directly to the eight chassis ground points.
- Rotate the module mechanical keyswitch on the terminal base to match the keying position required by the specific 1794 functional module.
- Verify field power supply voltages do not exceed the 125 VAC/DC voltage limit or 10 A total terminal bus current rating.
Allen-Bradley 1794-TB3T I/O Temperature Terminal Base Unit
Allen-Bradley 1794-TB3T I/O Temperature Terminal Base Unit
Configured for high-density signal termination and thermocouple interfacing in Allen-Bradley Flex I/O networks, the Allen-Bradley 1794-TB3T (1794-TB3T Flex I/O Terminal Base Unit) provides direct physical/electrical execution. This 16-point terminal interface incorporates internal temperature sensing and eight dedicated chassis ground terminals to process 125 VAC/DC signals across distributed control architectures.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TB3T |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.56 lbs (0.26 kg) |
| Dimensions | Standard Flex I/O Base Dimensions |
| Operating Temp | -20 to +70 deg C |
| Power Consumption | Passive Component / Rated up to 125 VAC/DC |
| Maximum Current Rating | 10 A total base current |
| I/O Capacity | Up to 16 input/output points |
| Chassis Ground Terminals | 8 dedicated chassis ground terminals |
| Operating Frequency Range | 50 Hz to 60 Hz |
| Relative Humidity | 5% to 95% (non-condensing) |
| Vibration Resistance | 5 g at 10 Hz to 150 Hz |
| Compatible Module Types | Thermocouple and high-density 1794 Flex I/O modules |
EtherNet/IP Deterministic Networks & Backplane Bus Velocity
The 1794-TB3T terminal base unit establishes the physical connection layer for the Flexbus backplane, enabling high-velocity data transfer between inserted functional modules and network adapters on EtherNet/IP control networks. The board includes continuous signal route trace shielding and low-impedance bus connections, maintaining deterministic transmission times across high-density I/O clusters. Designed for extended environmental conditions (-20 to +70 deg C), the unit preserves backplane signal integrity even when subjected to 5 g mechanical vibration across the 10 Hz to 150 Hz frequency band.
Frequently Asked Questions
Q: What is the maximum voltage and current capacity supported by the 1794-TB3T terminal base?
A: The terminal base is rated for operation up to 125 VAC/DC with a maximum continuous current capacity of 10 A across the terminal array.
Q: How many dedicated ground terminals are integrated into the 1794-TB3T chassis?
A: The base unit provides eight dedicated chassis ground terminals to facilitate single-point drain wire grounding for shielded instrument cables.
Q: What operating temperature range can the 1794-TB3T withstand in field enclosures?
A: The hardware operates within an extended ambient temperature range of -20 to +70 deg C (-4 to +158 deg F).
Field Installation Guidelines
- Snap the 1794-TB3T base unit firmly onto a grounded TS35 DIN rail, ensuring the locking latch fully engages the rail.
- Interlock adjacent Flex I/O bases by sliding them laterally to complete the internal Flexbus backplane connection.
- Wire field instrumentation to the cage-clamp or screw terminals, connecting cable drain shields directly to the eight chassis ground points.
- Rotate the module mechanical keyswitch on the terminal base to match the keying position required by the specific 1794 functional module.
- Verify field power supply voltages do not exceed the 125 VAC/DC voltage limit or 10 A total terminal bus current rating.
