Allen-Bradley 1747-L514 SLC 5/01 Processors

Configured for high-speed logic execution in distributed control networks, the Allen-Bradley 1747-L514 (1747-L514 SLC 5/01 Processor) provides direct physical/electrical execution. This hardware unit manages 4K of program memory and utilizes a capacitor-backed RAM architecture to facilitate command processing across modular I/O chassis configurations.

Hardware Specifications

Backplane Communication and Firmware Compatibility

The 1747-L514 relies on deterministic backplane bus communication to synchronize state data across the SLC 500 rack environment. The processor facilitates DH-485 communication protocols for network-level data exchange, requiring strict adherence to cable impedance specifications to prevent signal reflection on the link. I/O density scaling is constrained by the 30-module chassis capacity limit. Firmware flash compatibility is managed via the integrated 1747-M5 adapter socket; users must ensure that memory module revision states align with the base processor firmware to prevent checksum errors during the power-up initialization sequence.

Frequently Asked Questions

Q: Does the 1747-L514 support hot-swapping during active operation?

A: No. The SLC 5/01 processor is not designed for removal or insertion under power (RIUP). Attempting to remove the module while the backplane is energized may result in hardware damage or uncontrolled state transitions in the I/O bus.

Q: How is the program memory maintained when the processor is powered down?

A: The module uses capacitor-backed RAM for transient data retention. For long-term non-volatile storage, a 1747-M1 or 1747-M2 EEPROM memory module must be installed in the adapter socket to ensure the program is preserved during extended power loss.

Field Installation Guidelines

• Slot Assignment: The processor must be seated in Slot 0 of the primary I/O chassis to maintain proper backplane communication alignment.
• Mounting Stability: Ensure the module is fully inserted and the top/bottom retaining screws are tightened to provide mechanical stability and maintain electrical contact with the backplane connector.
• Grounding and Shielding: Ensure the chassis backplane is connected to a common earth ground. DH-485 communication cables should be shielded, with the shield terminated at a single point to prevent ground loops.
• Operating Environment: Install the module in an enclosure that maintains ambient temperatures between 0 deg C and 60 deg C with adequate airflow to prevent heat accumulation around the CPU circuitry.