PLC (programmable controller), 12DI/ 12DO. Support relay/transistor output, support AC90~260V/ DC20~30V ItemSpecificationsMain unit ItemXC1-24R-EXC1-24T-EXC1-24R-CXC1-24T- ... T299), with memory (T300-T399)1ms timer: set time 0.001-32.767 seconds (T400-T499), with memory (T500-T599)Counter ... -diagnose functionPower on self-diagnose, monitoring timer, grammar check. PLC (programmable controller) XC1-24