Allen Bradley 1756-CJC ControlLogix Controller Junction Card

FAQ

Q1: What is the 1756‑CJC used for?
It is a junction card that provides routing and termination points for field wiring connected to ControlLogix I/O modules.

Q2: Where is the 1756‑CJC installed?
It is mounted near or behind the ControlLogix chassis to consolidate terminal connections for I/O wiring.

Q3: Does the card handle I/O signals directly?
No — it provides a wiring interface; actual I/O handling is done by the I/O modules themselves.

Q4: What types of terminals are supported?
Terminal types vary based on the field wiring kit installed (screw or spring‑clamp).

Q5: Is the 1756‑CJC electrically isolated?
It provides wiring access consistent with the electrical ratings and isolation of the chassis and I/O modules.

Q6: What are the environmental operating limits?
It operates between 0 °C and +55 °C with humidity up to 95 % non‑condensing.

Q7: What are the physical size and weight of the junction card?
Dimensions are approximately 5.7 × 3.8 × 1.2 in and weight is about 0.25 kg.

Q8: Is the 1756‑CJC still produced by Rockwell Automation?
No — it is considered a discontinued legacy accessory for ControlLogix systems.