PLC-5 Migration Guide

PLC-5 to ControlLogix 1756 — the most common large-scale Allen-Bradley migration.

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In short

PLC-5 to ControlLogix 1756 — the most common large-scale Allen-Bradley migration.

Status

PLC-5 is discontinued since 2017. Field-spares are surplus-only.

Target

ControlLogix 1756-L8x with EtherNet/IP. Use the PLC-5/SLC to ControlLogix migration kit.

Major changes

16-bit integer data → 32-bit DINT tags
Block transfers → MSG instructions over EtherNet/IP
1492 conversion modules for discrete I/O reuse
ControlNet → EtherNet/IP backbone

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