In short
Migrate ControlLogix 1756-L55/L6x/L7x to current 1756-L8x — chassis reuse, firmware, redundancy.
Upgrade map
- 1756-L55 → 1756-L73 / L83E
- 1756-L61/L62/L63 → 1756-L83E / L84E
- 1756-L71/L72/L73/L74/L75 → drop-in same chassis
Reuse what you have
1756 chassis, power supply, and most 1756 I/O carry forward. Verify firmware in Studio 5000.
Redundancy
L7x/L8x redundancy uses 1756-RM2 — older RM1 must be upgraded in pairs.
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