Allen-Bradley 1745-LP101 SLC 100

The Allen-Bradley 1745-LP101, also cataloged as the 1745-LP101 Programmable Controller Processor Unit, operates as a dedicated hardware component for direct CPU execution and integrated discrete I/O control within SLC 100 platforms.

Hardware Specifications

Backplane Bus Interconnect & I/O Density Scaling

• Determinism & CPU Scan Execution: The integrated CPU executes user program logic directly against the 16 internal I/O points while driving real-time hardware status updates across the expansion backplane bus without network latency.
• Firmware Flash Compatibility & Address Mapping: Controller memory maps discrete bit registers straight into the internal processor register table, maintaining strict scan synchronization across connected expansion modules.
• Backplane Power Distribution: The embedded power supply converts incoming 85-132 VAC line power into regulated logic voltage, powering internal processor gates and sending expansion backplane bus power to downstream modules.

Frequently Asked Questions

Q: Does the 1745-LP101 retain user ladder logic when primary AC operating power is disconnected?

A: Yes. Volatile ladder program memory is preserved via an onboard battery-backed CMOS RAM module during main power interruptions.

Q: Can expansion chassis cables be connected or removed from the 1745-LP101 while under power?

A: No. Hot-swapping is prohibited. AC supply power must be isolated before plugging or unplugging ribbon bus cables to avoid backplane circuit damage.

Field Installation Guidelines

• Physical Mounting & Thermal Clearance: Mount the base unit vertically inside a sealed metallic enclosure using standard mounting hardware. Maintain a minimum vertical clearance of 50 mm (2 inches) above and below the chassis for unimpeded air convection.
• AC Input Power Wiring: Connect 120 VAC line power to designated supply terminals using properly sized copper conductors. Tighten screw terminals according to standard industrial torque specifications.
• Grounding & Shielding: Connect a dedicated, low-impedance copper ground braid from the unit frame ground point to the main enclosure grounding bar. Keep low-voltage signal wiring separated from power feeds by at least 200 mm to suppress electromagnetic noise coupling.