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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