PLC is widely used in industry, so plc's daily maintenance and maintenance become the focus.
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First, maintenance procedures, equipment, regular testing, adjustment regulations
(1) Check the connection status of the terminal blocks in the PLC cabinet every six months or quarters, and re-firmly connect in case of loosening;
(2) Re-measure the working voltage monthly for the power supply to the host in the cabinet;
Second, the provisions of regular cleaning equipment
(1) Clean the PLC every six months or quarters, cut off the power supply to the PLC, remove the power supply rack, the CPU main board, and the input/output board one by one, clean them in sequence, and then install them in-situ. After all connections are restored, power is transmitted and the PLC host is started. Seriously clean the inside of the PLC box;
(2) Replace the filter below the power supply rack every three months;
Third, pre-service preparation, maintenance procedures
(1) Ready tools before overhaul;
(2) In order to ensure that the components do not fail and the module is not damaged, protection devices must be used and the ESD must be carefully prepared;
(3) Contact with the dispatcher and operator before overhaul, hang the inspection card and hang the inspection card;
Fourth, equipment disassembly order and method
(1) Shutdown and maintenance must be performed by more than two persons;
(2) Turn the mode selection switch on the front panel of the CPU from "RUN" to "STOP";
(3) Turn off the PLC main power supply, and then turn off the other power supply to the module;
(4) After the power cord connected to the power supply shelf is marked with the line number and connection position, remove it, and then remove the screws connecting the power supply rack and the cabinet, and the power supply rack can be removed;
(5) The CPU main board and I/O board can be removed after the screw under the rotating template;
(6) Install in reverse order;
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