The Allen-Bradley 1756-L1M3 ControlLogix 5550 Controller Processor includes an open enclosure and includes 2mb of expansion memory. The module does not have a nonvolatile memory, and its compatible programming cables include the serial cable category 3 1756-CP3 and 1747-CP3 cables. The 1756-BA1 0.59 lithium battery is the only compatible replacement battery.
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