Allen-Bradley 1745-LP151 SLC 150 Point Processor Unit

Configured for discrete control execution and direct field signal processing in SLC 150 platforms, the Allen-Bradley 1745-LP151 (1745-LP151 Point Processor Unit) provides direct physical/electrical execution across 32 integrated discrete I/O points.

Hardware Specifications

Backplane Bus Interconnect & I/O Density Scaling

• Determinism & Bus Scan Execution: The embedded CPU processes logic routines with a fixed 4 ms scan time, executing 20 digital AC input reads and 12 output drive updates simultaneously across physical terminal blocks and expansion backplane interconnects.
• Firmware Flash Compatibility & Address Mapping: Internal registers map 1200 words of user memory straight to the hardware I/O table, providing deterministic bit addressing without protocol latencies.
• Galvanic Isolation & Noise Mitigation: High-voltage Triac output channels and optoisolated 85-132 VAC input lines prevent electrical surges from degrading internal processor logic execution.

Frequently Asked Questions

Q: Can the 1745-C2 communication cable be connected or removed while the 1745-LP151 is energized?

A: No. Hot-swapping communication connections is prohibited. Line voltage to the 1745-LP151 unit must be fully isolated before connecting or disconnecting the 1745-C2 cable to avoid interface driver failure.

Q: How does the 1745-LP151 handle distinct AC and relay output loads?

A: The 10 Triac outputs manage solid-state 85-265 VAC switching for high-duty digital loads, while the 2 hard contact relay outputs handle dry contact signals or isolated switching loops.

Field Installation Guidelines

• Physical Mounting & Thermal Clearance: Mount the unit securely on an enclosure backpanel using standard hardware. Maintain a minimum vertical clearance of 50 mm (2 inches) above and below the chassis for unhindered air convection across the enclosure.
• Terminal Wiring & Line Isolation: Route AC input lines and AC Triac output cables through independent wiring ducts. Secure conductors firmly to the screw terminals following standard industrial torque specifications.
• Grounding Protocols: Connect a low-impedance copper ground strap directly from the ground terminal on the 1745-LP151 chassis to the cabinet earth ground bus bar. Maintain a minimum distance of 200 mm between low-voltage signal cabling and high-power motor leads.