Allen Bradley 1745-LP102 CPU Processors

Configured for discrete control execution and CPU processing in SLC 100 programmable controller platforms, the Allen-Bradley 1745-LP102 (1745-LP102 Processor Unit) provides direct physical/electrical execution across integrated hardware circuits.

Hardware Specifications

Backplane Bus Interconnect & I/O Density Scaling

• Determinism & Bus Execution: The 1745-LP102 processor executes internal ladder logic cycles while managing continuous hardware status updates over the parallel expansion bus header with zero network protocol latencies.
• Firmware Flash Compatibility & Memory Mapping: Logic memory register tables map directly into the central processing core, enforcing strict scan synchronization and execution timing across local and expansion I/O banks.
• Galvanic Isolation & Power Distribution: Regulated power conversion stages feed internal CPU logic gates and optoisolated backplane drivers, preventing external line transients from disrupting processing cycles.

Frequently Asked Questions

Q: Can the 1745-LP102 processor unit be disconnected or connected to expansion chassis while under power?

A: No. Hot-swapping is prohibited. Master electrical power must be de-energized prior to connecting or removing the parallel expansion bus ribbon cable to prevent damage to internal backplane drivers.

Q: How are expansion modules addressed by the 1745-LP102 central processor?

A: Connected expansion units are assigned fixed memory addresses in sequence along the expansion bus, allowing direct registration within the primary memory image table.

Field Installation Guidelines

• Physical Mounting & Thermal Clearance: Mount the unit vertically on an enclosure backpanel using standard mounting hardware. Maintain a minimum vertical clearance of 50 mm (2 inches) above and below the chassis to ensure adequate natural thermal convection.
• Bus Expansion Cabling: Verify that the expansion bus ribbon cable is correctly oriented and fully locked into the unit header before restoring supply power.
• Grounding & Noise Mitigation: Connect a dedicated low-impedance ground wire directly from the ground stud to the central enclosure earth ground bus. Separate low-voltage control lines from high-voltage motor conductors by at least 200 mm to suppress noise coupling.