Allen-Bradley 1745-E103 SLC 100 Expansion Chassis

The Allen-Bradley 1745-E103, also cataloged as the 1745-E103 PLC Expansion Unit, operates as a dedicated hardware component for localized digital I/O processing within Allen-Bradley SLC 100 platforms.

Hardware Specifications

Allen-Bradley Technical Characteristics

• Backplane Bus Communication Velocity: Executes direct register updates across the local extension bus interface to prevent scan-time latency during discrete I/O state evaluations.
• I/O Density Scaling: Increases physical rack terminal density by bridging low-voltage AC/DC field sensors and multi-voltage load circuits directly into the base controller memory map.

Frequently Asked Questions

Q: Can the 1745-E103 expansion chassis be connected or disconnected while system power is active?

A: No. Connecting or disconnecting the interconnect cable while line voltage is applied can trigger processor backplane fault trips and risk component damage.

Q: What operational input voltage range does the 1745-E103 support on its input channels?

A: The input channels are rated to process discrete signals operating within the 10-30 VAC/DC voltage threshold.

Q: Are the output contacts on the 1745-E103 restricted solely to AC loads?

A: No. The output circuits accommodate switching for both AC loads (10-250 VAC, 50/60 Hz) and DC loads (10-125 VDC).

Field Installation Guidelines

1. De-energize all primary line power sources (120/240 VAC) and field supply loops before mounting or wiring the 1745-E103 unit.
2. Fasten the chassis firmly to the enclosure mounting panel to establish a solid physical ground connection and ensure passive heat dissipation.
3. Keep field input/output wiring separated from AC mains lines and variable frequency drive leads to reduce electromagnetic interference.
4. Maintain a 2.0 in (50.8 mm) clearance above and below the chassis assembly to permit adequate thermal airflow.