Configured for wire strain relief and high-density cable routing in ControlLogix platforms, the Allen-Bradley 1756-TBE (1756-TBE Extended-Depth Terminal Block Housing) provides direct physical protection for heavy-gauge I/O connections.
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) from module front to back of chassis
Operating Temp
0 to 60 deg C (32 to 140 deg F)
Power Consumption
Max 6.19 W power dissipation
Product Line
ControlLogix
Product Type
Terminal Block Housings
Connection Type
36-Pin Removable Terminal Block (RTB) connection support
The module housing supports backplane bus communication velocity and mechanical protection for high-density signal wiring across 1756 I/O architecture. Designed to replace standard front covers when using heavy-gauge conductors (up to 2.5 mm squared / 14 AWG), the extended enclosure prevents mechanical strain on internal card pins. Firmware flash compatibility and electrical loop integrity remain uncompromised across high-density I/O density scaling configurations by maintaining structural clearance and routing stability.
Frequently Asked Questions
Q: When is it mandatory to use the 1756-TBE extended-depth housing instead of a standard RTB cover?
A: The 1756-TBE is required when using heavy-gauge field wiring (such as 14 AWG / 2.5 mm squared conductors) or when total wire bundle cross-sectional volume exceeds standard RTB housing limits, reaching up to 628 sq mm.
Q: Can the 1756-TBE housing be installed while field-side power is active?
A: No. Field-side power must be completely isolated prior to mounting or removing the housing to prevent accidental short circuits, unintended machine motion, or electrical hazards.
Field Installation Guidelines
De-energize all field-side power circuits connected to the target 1756 Removable Terminal Block (RTB) before assembly.
Remove the existing standard cover from the RTB assembly if upgrading to the extended-depth housing.
Align the bottom grooves of the 1756-TBE housing side-by-side with the side edges of the wired RTB.
Slide the housing smoothly over the RTB wiring arm until the locking tab snaps securely into place.
Dress field conductors straight through the extended cable wireway, ensuring no excessive strain is applied to individual terminal screws or card connector pins.
