Allen-Bradley 1747-L541 SLC 5/04 Processor Module

The Allen-Bradley 1747-L541, also cataloged as the 1747-L541 Processor Module, operates as a dedicated hardware component for central program execution and multi-chassis I/O scanning within SLC 500 rack assemblies.

Hardware Specifications

Deterministic Backplane & EtherNet/IP Networks

Integrated into Slot 0 of the local chassis, the processor drives high-velocity backplane bus communication across up to 3 local rack frames (30 total slots). The onboard Data Highway Plus (DH+) and RS-232 communication channels support peer-to-peer data transfers and system monitoring without disrupting local cyclic I/O scans. High firmware flash compatibility ensures synchronized program memory management across Flash EEPROM structures while maintaining deterministic execution latencies down to 0.9 ms per kiloword across connected industrial network topologies.

Frequently Asked Questions

Q: What are the primary onboard communication interfaces available on the 1747-L541 CPU?

A: The module features dedicated DH+ (Data Highway Plus) for high-speed peer-to-peer processor networking and an RS-232 channel for point-to-point serial communication and programming setup.

Q: What maximum I/O count can the 1747-L541 address across local chassis expansion?

A: The processor can manage up to 8192 digital I/O points distributed across a maximum configuration of 3 local chassis (30 total slots).

Q: Does the 1747-L541 support non-volatile memory backup without external battery power?

A: Yes, non-volatile user logic and table data backup can be maintained using compatible Flash EEPROM memory modules installed directly onto the processor board.

Field Installation Guidelines

Ensure main power to the SLC 500 chassis power supply is completely switched off before inserting or removing the processor card. Align the 1747-L541 card edge with the guide rails of Slot 0 in the primary chassis frame, sliding the unit inward until the chassis retaining levers lock securely.

Connect DH+ communication wiring using standard 3-conductor shielded twinaxial cable (Belden 9463), ensuring proper connection to the 3-pin DH+ connector (Clear, Shield, Blue). Land the cable shield drain wire at a single enclosure earth ground point to prevent ground loops. Maintain a minimum separation distance of 12 inches between network communication cables and high-voltage AC power wiring inside electrical control panels.