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ABB AC500 PM554-RP-AC programmable logic controller, AC-supply relay-output variant.
ABB AC500 PM554-RP-AC compact PLC, order code 1SAP120800R0001, 8 DI / 6 relay DO, 142 kB RAM, 1x RS485, 2x option slots.
ABB AC500 PM554-T programmable logic controller, transistor-output variant.
ABB AC500-eCo PM554-T processor module, 128 kB, 8 DI / 6 DO, 24 V DC, pluggable I/O terminal blocks, no onboard Ethernet.