PLC transmission line automatic reclosing control circuit

Control process analysis of the control process of the j-phase automatic reclosing device of the transmission line     (2) PLC model selection and 1/0 definition   According to the needs of the actual application, the controller of the automatic reclosing device can choose a small PLC from OMRON Company, and the input is 12 points , the output is 8 points, the power supply voltage is AC100-240V. The I/O terminal definition of PLC is shown in Table 26-3, and the external wiring is shown in Figure 26-7. The input terminal of the PLC is connected to the control switch K (its nodes include Kl, K2, K3, and K4), the closing pressure locking switch SQ1, the opening pressure locking switch SQ2, and the circuit breaker auxiliary contact DL. The output terminal is connected to the circuit breaker closing contactor HC, the accelerating trip contactor 1JK, and the trip locking contactor 2JK.