OVERVIEW

Official designation: Allen-Bradley 1747-L543 (SLC 500, Modular Controller)

The 1747-L543 is a modular SLC 5/04 CPU, offering 64 KB user memory and supporting up to 4096 discrete I/O points across three chassis. It features built-in DH+ and RS-232 communication ports.

KEY SPECS SUMMARY

Power: 5V DC backplane, 1 Amp

Interfaces / Ports: 1 DH+ port, 1 RS-232 port

Indicators: Run, Fault, Force, BATT, RS-232 Tx/Rx, DH+ Status

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: SLC 500 modular chassis

Limit: 64 KB memory, 4096 I/O

Lifecycle: Discontinued

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the maximum number of I/O points supported by the 1747-L543 modular controller?

A: The processor supports a maximum of 4096 discrete I/O points across local and remote chassis.

Wiring & Installation:

Q: What is the purpose of the built-in RS-232 port on the SLC 5/04 modular controller?

A: The port is used for programming, monitoring, and communication with other devices like HMIs or modems.

Troubleshooting & Compatibility:

Q: What does a flashing BATT LED on the 1747-L543 typically indicate to the user?

A: A flashing BATT LED signals that the lithium battery backup needs replacement to prevent memory loss.

Replacement & Upgrades:

Q: Does the 1747-L543 require an external memory module for the 64 KB program storage?

A: No, the 64 KB RAM is internal; the processor includes a slot for optional non-volatile backup memory modules.