Allen-Bradley 1756-TBE ControlLogix Extended-Depth Terminal Housing
Configured for high-density conductor routing in ControlLogix chassis I/O systems, the Allen-Bradley 1756-TBE (1756-TBE Terminal Block Housing) provides direct physical/electrical execution. It replaces standard removable terminal block (RTB) covers to expand physical housing depth to 157.43 mm, securing 36-pin field wiring connections. The component accommodates heavy-gauge wiring up to 14 AWG (2.5 mm2) while maintaining mechanical isolation over the front of the 1756 I/O module assembly.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1756-TBE |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.19 lbs (0.09 kg) |
| Dimensions | Extended Depth: 157.43 mm (6.198 in) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | Power Dissipation: 6.19 W max |
| Backplane Current | 1200 mA at 5 VDC / 2.5 mA at 24 VDC |
| Module Type | Removable Terminal Block Extended Cover |
| Pin Configuration | 36-Pin Terminal Connection |
| Wire Capacity | Up to 628 sq mm total capacity (20 to 14 AWG) |
| Enclosure Type Rating | None (Open Style) |
Deterministic I/O & Backplane Integrity
The 1756-TBE housing preserves signal integrity across ControlLogix backplane bus structures by shielding field-side termination points from external physical mechanical strain. Maintaining clear physical separation between heavy-gauge field wiring runs eliminates stress on internal I/O module terminal pins. This protection supports deterministic EtherNet/IP I/O scan execution and maintains backplane communication velocity without field noise coupling or conductor detachment risks.
Frequently Asked Questions
Q: When is it necessary to specify the 1756-TBE extended-depth housing over the standard 1756 RTB cover?
A: The 1756-TBE is required when field wiring conductors exceed standard 18 AWG sizes (up to 14 AWG or 2.5 mm2), or when high-density wire bundles require up to 628 sq mm of total routing volume within the housing shell.
Q: Can the 1756-TBE housing be installed or removed while field power is applied to the RTB?
A: Field power must be fully de-energized prior to installing or removing the terminal housing to eliminate risks of accidental short circuits, electrical shock, or unintended process control disruption.
Field Installation Guidelines
- Power Isolation: Turn off all field-side power sources and system chassis power prior to engaging or removing the terminal housing assembly.
- Alignment: Align the bottom guide grooves of the 1756-TBE side-by-side with the side edges of the wired Removable Terminal Block (RTB).
- Mechanical Latching: Slide the extended housing cover flush over the RTB assembly until the retaining tabs lock securely into place.
- Wire Strain Relief: Route 20 AWG to 14 AWG wire bundles cleanly through the lower cable exit slot, using tie-wraps to prevent tension on individual 36-pin terminal screws.
- Chassis Seating: Verify that the RTB with the installed 1756-TBE housing latches completely onto the front card guide of the 1756 I/O module to ensure positive backplane pin engagement.
Allen-Bradley 1756-TBE ControlLogix Extended-Depth Terminal Housing
Allen-Bradley 1756-TBE ControlLogix Extended-Depth Terminal Housing
Configured for high-density conductor routing in ControlLogix chassis I/O systems, the Allen-Bradley 1756-TBE (1756-TBE Terminal Block Housing) provides direct physical/electrical execution. It replaces standard removable terminal block (RTB) covers to expand physical housing depth to 157.43 mm, securing 36-pin field wiring connections. The component accommodates heavy-gauge wiring up to 14 AWG (2.5 mm2) while maintaining mechanical isolation over the front of the 1756 I/O module assembly.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1756-TBE |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.19 lbs (0.09 kg) |
| Dimensions | Extended Depth: 157.43 mm (6.198 in) |
| Operating Temp | 0 to 60 deg C (32 to 140 deg F) |
| Power Consumption | Power Dissipation: 6.19 W max |
| Backplane Current | 1200 mA at 5 VDC / 2.5 mA at 24 VDC |
| Module Type | Removable Terminal Block Extended Cover |
| Pin Configuration | 36-Pin Terminal Connection |
| Wire Capacity | Up to 628 sq mm total capacity (20 to 14 AWG) |
| Enclosure Type Rating | None (Open Style) |
Deterministic I/O & Backplane Integrity
The 1756-TBE housing preserves signal integrity across ControlLogix backplane bus structures by shielding field-side termination points from external physical mechanical strain. Maintaining clear physical separation between heavy-gauge field wiring runs eliminates stress on internal I/O module terminal pins. This protection supports deterministic EtherNet/IP I/O scan execution and maintains backplane communication velocity without field noise coupling or conductor detachment risks.
Frequently Asked Questions
Q: When is it necessary to specify the 1756-TBE extended-depth housing over the standard 1756 RTB cover?
A: The 1756-TBE is required when field wiring conductors exceed standard 18 AWG sizes (up to 14 AWG or 2.5 mm2), or when high-density wire bundles require up to 628 sq mm of total routing volume within the housing shell.
Q: Can the 1756-TBE housing be installed or removed while field power is applied to the RTB?
A: Field power must be fully de-energized prior to installing or removing the terminal housing to eliminate risks of accidental short circuits, electrical shock, or unintended process control disruption.
Field Installation Guidelines
- Power Isolation: Turn off all field-side power sources and system chassis power prior to engaging or removing the terminal housing assembly.
- Alignment: Align the bottom guide grooves of the 1756-TBE side-by-side with the side edges of the wired Removable Terminal Block (RTB).
- Mechanical Latching: Slide the extended housing cover flush over the RTB assembly until the retaining tabs lock securely into place.
- Wire Strain Relief: Route 20 AWG to 14 AWG wire bundles cleanly through the lower cable exit slot, using tie-wraps to prevent tension on individual 36-pin terminal screws.
- Chassis Seating: Verify that the RTB with the installed 1756-TBE housing latches completely onto the front card guide of the 1756 I/O module to ensure positive backplane pin engagement.
