Allen-Bradley 1745-E104 SLC 100 Expansion Unit

Configured for local rack expansion in Allen-Bradley SLC 100 platforms, the Allen-Bradley 1745-E104 (1745-E104 PLC Expansion Unit) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

Hardware Specifications

Allen-Bradley Technical Characteristics

• Backplane Bus Communication Velocity: Establishes deterministic high-speed register updates across the local extension bus interface to prevent scan-time latency during discrete I/O evaluation.
• I/O Density Scaling: Integrates local expansion hardware directly into the primary processor memory map without introducing external communication protocol overhead.

Frequently Asked Questions

Q: Can the 1745-E104 expansion unit be hot-swapped while the system is powered?

A: No. The 1745-E104 interconnect bus must be connected or disconnected only when primary line power is isolated to prevent backplane communication errors or hardware faults.

Q: What power input specs does the 1745-E104 require for internal logic operation?

A: The module operates on an AC line voltage rating of 10-250 VAC at 50/60 Hz with a nominal current draw of 0.22 A.

Q: Is a separate network interface required to communicate with the SLC 100 base processor?

A: No. Communication is handled natively via the bus interconnect cable connected directly to the SLC 100 CPU rack.

Field Installation Guidelines

1. Turn off primary power supplying the main SLC 100 unit and expansion chassis prior to hardware installation or cable attachment.
2. Fasten the chassis firmly to a grounded mounting panel to maintain proper frame ground continuity and mechanical stability.
3. Keep interconnect expansion cables isolated from high-voltage AC lines and VFD motor cables to minimize electromagnetic interference.
4. Provide a minimum top and bottom clearance of 2.0 in (50.8 mm) within the enclosure to allow sufficient heat dissipation.