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ABB CI521-MODTCP Distributed Automation I/Os
CI521-MODTCP: S500 Interface module. Modbus TCP server. 4 AI: U, I, RTD. 2 AO: U, I. 8 DI: 24VDC. 8 DO: 24VDC 0.5A. Extendable by up to 10 I/O modules.
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