1、 Maintenance procedures, regular equipment testing and adjustment regulations

(1) Check the connection of the wiring terminals in the PLC cabinet semiannually or quarterly, and if any looseness is found, re firmly connect it in time;

(2) Re measure the working voltage of the power supply in the cabinet for the host every month;

2、 Regulations on regular cleaning of equipment

(1) Clean the PLC every six months or quarter, cut off the power supply to the PLC, remove the power supply rack, CPU main board and input/output board in turn, purge and clean them, then install them in situ in turn, power on and start the PLC host after all connections are restored. Carefully clean the PLC box;

(2) Replace the filter screen under the power supply rack every three months;

3、 Preparation before maintenance and maintenance procedures

(1) Prepare tools before maintenance;

(2) In order to ensure that the functions of components will not fail and the formwork will not be damaged, protective devices must be used and anti-static preparations must be made carefully;

(3) Contact the dispatcher and operator well before maintenance, and hang the maintenance board where it is required;

4、 Equipment disassembly sequence and method

(1) Two or more people must supervise the operation when the machine is shut down for maintenance;

(2) Turn the mode selection switch on the CPU front panel from “Run” to “Stop”;

(3) Turn off the main power supply of the PLC, and then turn off other power supplies to the module board;

(4) Record the wire number and connection position of the power cord connected to the power rack, and then remove it. Remove the screws connecting the power rack to the cabinet, and then the power rack can be removed;

(5) The CPU main board and I/O board can be removed after rotating the screws under the template;

(6) The installation shall be carried out in reverse order;