Configured for discrete I/O expansion tasks in legacy programmable controller networks, the Allen-Bradley 1745-E102 (1745E102 Expansion Unit) provides direct physical/electrical execution.

Model Identification Matrix

• Catalog Number: 1745-E102
• Base Family: SLC-100 / SLC-150
• Lifecycle Status: Discontinued by Manufacturer (2014-04-16)
• Component Classification: Expansion Unit

Hardware Specifications

Programmable Controller Network Integration

The unit interfaces with the primary processor module through a dedicated physical expansion cable, extending the I/O capacity within the backplane bus framework. It executes deterministic data exchange routines without requiring localized processing firmware. Terminal connections rely on fixed screw terminals capable of terminating standard copper wire gauges suited for industrial control enclosures.

Ordering Information

• 1 1745-E102 Expansion Unit module
• 1 Factory packaging and desiccant pouch

Physical Installation Guidelines

• Enclosure Mounting: Mount the unit vertically on a standard DIN rail or panel surface inside a NEMA-rated industrial enclosure to prevent particulate accumulation.
• Clearance Requirements: Maintain a minimum spatial clearance of 50 mm above and below the housing to facilitate thermal dissipation.
• Grounding Protocol: Connect the chassis ground terminal directly to the enclosure grounding busbar using a low-impedance braided copper strap.

Frequently Asked Questions

• Q: Does the 1745-E102 support hot-swapping during active operation?
• A: No. Power must be fully isolated from the rack before inserting or removing the expansion unit to prevent bus corruption.
• Q: What is the maximum allowable cable length between the base processor and the expansion unit?
• A: The physical expansion bus is restricted to short-distance interconnections within the same panel enclosure as specified by legacy design rules.
• Q: How does the unit derive its operational power?
• A: Operating power is drawn directly from the connected SLC-100 or SLC-150 processor unit via the internal expansion bus ribbon.
• Q: Are firmware updates required for this hardware revision?
• A: No. The unit operates via hardwired logic mapping and requires no field-programmable firmware flashes.
• Q: What industrial protocol governs the backplane communication of this unit?
• A: It utilizes a proprietary, deterministic serial bus architecture specific to the Allen-Bradley SLC-100 and SLC-150 product platforms.
• Q: Can this module interface with modern CompactLogix controllers?
• A: No. It is exclusively engineered for legacy SLC-100 and SLC-150 system architectures and lacks modern network protocol support.
• Q: What gauge of wire is recommended for field wiring terminals?
• A: Use stranded or solid copper wire ranging from 22 AWG to 14 AWG, torque-tightened to manufacturer specifications.
• Q: What indicates a hardware fault on the expansion unit module?
• A: A total loss of communication with the master processor or failure of the internal power rail illuminates corresponding fault states on the host CPU.