(1) Downtime, must be two or more monitoring operation;
(2) The way the CPU on the front panel select switch from the \ \
(3) Close the PLC power supply mains, and then close the other to the power supply module Osaka;
(4) Connected to the power supply rack power cord clear line number keep in mind and remove the link location, then remove the power rack and rack screws connected, power rack can be removed;
(5) CPU motherboard and I / 0 boards in the bottom of the screw rotation after template changed;
(6) Installed in reverse order;
5. Maintenance process and technical requirements
(1) measure voltage, use a digital voltmeter or accuracy of 1% of the multimedia, measure
(2) the power rack, CPU board can only be removed when the main power cut off;
(3) RAM module to remove or insert the CPU from the CPU prior to disconnect the PC's power supply, so as to ensure the data is not confused;
(4) before removing RAM modules, check the battery module is working correctly, if the battery fault light is removed when the PAM module content
will be lost;
(5) input / output board should be removed before the first turn off the mains, but if the production of necessary I / 0 boards can be removed at run-time programmable controllers, but the CPU board QVZ (overtime) lights; (6) pluggable template, to be more careful, gently, and the goods shipped out of static electricity;
(7) the replacement of components not live action;
(8) Maintenance must be placed after the template installed in place Second, installment and wiring
1. The power line, the pilot wire as well as the PLC power line and the I/O line should distinguish the wiring, between the insulating transformer and PLC and I/O should use the double rubberized wire connection.
2. PLC should be far away from the strong jamming source like electric welding machine, the high efficiency silicon rectifier unit and the large-scale power equipment, cannot install with the high-pressured electric appliance in the identical switch cabinet.
3. The input and output of PLC are best separate the line, the switch quantity and the simulation quantity must separate the placing. The simulation quantity signal's transmission should use the shielded wire, the shielding layer should an end or the both sides earth, and the earth
resistance should be smaller than the shielding layer resistance 1/10. 4. The PLC elemental area and the expansion unit as well as functional module's ties cable should lie alone, prevents the outside signal the disturbance.
5.The exchange output line and the direct-current output line do not use the identical root electric cable, the output line to be far away from the high tension line and the power line as far as possible, avoids parallel. Third, I/O port wiring 1. Input wiring
(1) Inputs the wiring not to surpass 30 meters generally. But if the environment disturbance is small, when the loss of voltage is not big, the input wiring may suitable long.
(2) Inputs/the output line not to be able to use the identical root electric cable, the input/output line to be separated.
(3) Uses the normally opened contact form to connect the input end as far as possible, causes the establishment the trapezoidal chart to be consistent with the relay schematic diagram, is advantageous for reading. 2. Output wiring
(1) The out-put wiring divides into the independent output and the public output. In not group, may use the different type and the voltage class
output voltage. But can only use the identical type, the identical voltage class power source in the identical group's output.
(2) Because the PLC output element is sealed on the print circuit wafer, and connects to the terminal strip, if will connect output element's load short circuit, will burn down the print circuit wafer, therefore, application fuse protection output element.
(3) Uses when the relay outputs, withstands inductive load's size, will affect relay's service life, therefore, time use inductive load the selective relay working life must be long.
(4) The PLC output load possibly has the disturbance, must therefore take the measure to control, if direct-current output's after flow guarantees protects, the exchange output anti- accommodates the absorbing circuit, the transistor and the bidirectional thruster output by-passed resistor protection.
Fourth, outside security electric circuit to guarantee that the overall system can under the secure state the reliable work, avoids, because the external power supply breaks down, PLC to present the heavy economic loss which and the person casualty exceptionally, the disoperation as well as outputs by mistake creates, PLC the outside should install the essential protection circuit.
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