Allen-Bradley 1794-TB3GS Spring Clamp Terminal Base Unit
The Allen-Bradley 1794-TB3GS, also cataloged as the 1794-TB3GS Terminal Base Unit, operates as a dedicated hardware component for high-density I/O wiring termination within Flex I/O 1794 backplane network assemblies. Featuring 36 spring clamp I/O terminals alongside dedicated power and common connections, this base routes field signals directly to removable 1794 functional modules while maintaining continuous system power and backplane communication.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TB3GS |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.28 kg (0.63 lbs) |
| Dimensions | Standard 1794 Base Form Factor |
| Operating Temp | -20 to 70 deg C |
| Power Consumption | Passive Base Assembly |
| Supply Voltage Rating | 24 V AC/DC |
| Maximum Current Rating | 10.0 A |
| Terminal Type | Spring Clamp Terminals |
| I/O Terminals | 36 Terminals |
| Common Terminals | 2 Terminals |
| Voltage Terminals | 2 Terminals |
| Enclosure Type | Open Style (IP20) |
| Mounting Type | 35 mm DIN Rail |
Backplane Bus Communication and Deterministic Network Integration
The 1794-TB3GS incorporates an integrated backplane bus pass-through interface engineered to preserve backplane bus communication velocity across adjacent Flex I/O modules. Designed for seamless integration into EtherNet/IP and ControlNet deterministic networks via 1794 adapter modules, the base structure maintains continuous signal path continuity during field operations. The spring clamp terminal configuration ensures consistent contact pressure under industrial mechanical vibration, mitigating signal intermittent dropouts and suppressing high-frequency noise interference across sensitive digital and analog I/O channels.
Frequently Asked Questions
Q: What are the installation advantages of spring clamp terminals on the 1794-TB3GS?
A: Spring clamp terminals eliminate screw-torque maintenance requirements and resist wire loosening caused by continuous industrial vibration. They provide consistent clamping force on 36 field signal terminations, reducing field wiring setup time and contact degradation.
Q: Can an I/O module be replaced on a 1794-TB3GS base without removing power from the whole backplane?
A: Yes. Under RIUP (Removal and Insertion Under Power) protocol limits, functional Flex I/O modules can be detached and replaced from the 1794-TB3GS base while the base unit maintains field power bus continuity and backplane pass-through signals to adjacent modules.
Q: How are common and power voltage distribution buses wired on this base unit?
A: The base provides 2 dedicated voltage terminals and 2 dedicated common terminals alongside the 36 signal points, allowing direct cross-marshaling of 24 V AC/DC field power without requiring external terminal blocks.
Field Installation Guidelines
- DIN-Rail Attachment: Snap the 1794-TB3GS onto a standard 35 mm DIN rail (EN 50022). Slide the base sideways to firmly interlock its backplane connector with the adjacent 1794 module base or adapter.
- Spring Clamp Wiring: Insert a small flat-blade screwdriver into the actuator slot to open the spring clamp cage. Insert stripped solid or stranded wire into the conductor port and release the spring mechanism for a vibration-resistant termination.
- Power and Signal Separation: Group 24 V AC/DC power supply leads away from low-voltage analog signal lines within panel wire ducts to prevent electromagnetic coupling.
- Enclosure Requirements: Mount the IP20 open-style assembly inside an NEMA or IP54 industrial enclosure to protect against dust, airborne contaminants, and conductive moisture.
Allen-Bradley 1794-TB3GS Spring Clamp Terminal Base Unit
Allen-Bradley 1794-TB3GS Spring Clamp Terminal Base Unit
The Allen-Bradley 1794-TB3GS, also cataloged as the 1794-TB3GS Terminal Base Unit, operates as a dedicated hardware component for high-density I/O wiring termination within Flex I/O 1794 backplane network assemblies. Featuring 36 spring clamp I/O terminals alongside dedicated power and common connections, this base routes field signals directly to removable 1794 functional modules while maintaining continuous system power and backplane communication.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1794-TB3GS |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.28 kg (0.63 lbs) |
| Dimensions | Standard 1794 Base Form Factor |
| Operating Temp | -20 to 70 deg C |
| Power Consumption | Passive Base Assembly |
| Supply Voltage Rating | 24 V AC/DC |
| Maximum Current Rating | 10.0 A |
| Terminal Type | Spring Clamp Terminals |
| I/O Terminals | 36 Terminals |
| Common Terminals | 2 Terminals |
| Voltage Terminals | 2 Terminals |
| Enclosure Type | Open Style (IP20) |
| Mounting Type | 35 mm DIN Rail |
Backplane Bus Communication and Deterministic Network Integration
The 1794-TB3GS incorporates an integrated backplane bus pass-through interface engineered to preserve backplane bus communication velocity across adjacent Flex I/O modules. Designed for seamless integration into EtherNet/IP and ControlNet deterministic networks via 1794 adapter modules, the base structure maintains continuous signal path continuity during field operations. The spring clamp terminal configuration ensures consistent contact pressure under industrial mechanical vibration, mitigating signal intermittent dropouts and suppressing high-frequency noise interference across sensitive digital and analog I/O channels.
Frequently Asked Questions
Q: What are the installation advantages of spring clamp terminals on the 1794-TB3GS?
A: Spring clamp terminals eliminate screw-torque maintenance requirements and resist wire loosening caused by continuous industrial vibration. They provide consistent clamping force on 36 field signal terminations, reducing field wiring setup time and contact degradation.
Q: Can an I/O module be replaced on a 1794-TB3GS base without removing power from the whole backplane?
A: Yes. Under RIUP (Removal and Insertion Under Power) protocol limits, functional Flex I/O modules can be detached and replaced from the 1794-TB3GS base while the base unit maintains field power bus continuity and backplane pass-through signals to adjacent modules.
Q: How are common and power voltage distribution buses wired on this base unit?
A: The base provides 2 dedicated voltage terminals and 2 dedicated common terminals alongside the 36 signal points, allowing direct cross-marshaling of 24 V AC/DC field power without requiring external terminal blocks.
Field Installation Guidelines
- DIN-Rail Attachment: Snap the 1794-TB3GS onto a standard 35 mm DIN rail (EN 50022). Slide the base sideways to firmly interlock its backplane connector with the adjacent 1794 module base or adapter.
- Spring Clamp Wiring: Insert a small flat-blade screwdriver into the actuator slot to open the spring clamp cage. Insert stripped solid or stranded wire into the conductor port and release the spring mechanism for a vibration-resistant termination.
- Power and Signal Separation: Group 24 V AC/DC power supply leads away from low-voltage analog signal lines within panel wire ducts to prevent electromagnetic coupling.
- Enclosure Requirements: Mount the IP20 open-style assembly inside an NEMA or IP54 industrial enclosure to protect against dust, airborne contaminants, and conductive moisture.
