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PLC discrete AC I/O modules monitor and control devices that operate with AC voltage ranges up to 240 VAC such as power relays, pumps, motor starters and contactors. Relay modules provide surge-protected outputs for DC or AC voltage-rated (6-24 VDC/6-120 VAC) devices. Productivity1000 AC I/O and relay modules provide up to 16 I/O points depending on model.