Share - 10 of PLC maintenance method

01 classplc what types of failure? External equipment failure

external equipment is the actual process with controller directly linked to all kinds of switches, sensors, actuators, load, etc. The equipment failure, will directly affect the control function of system. Maintenance of , therefore, must first distinguish external equipment failure, failure or itself.

system

1) System failure is affecting the operation of system overall failure.

2) system fault can be divided into constant fault, the chance of failure.

3) Failure happens, can restart the system back to normal, it is the chance of failure. If restart can't recover, but need to replace the hardware or software, the system was able to return to normal, is considered to be constant fault. Hardware failure

hardware failure mainly refers to the template in system, circuit damage caused by the fault.

software malfunction of software failures include software error, error, etc. self-diagnosis software failure generally can test functionality or software to check and inspection.

02 classplc control system failure rate of what is going on? 1) CPU and memory failure rate 5%.

3) Sensor and switch failure rate was 45%.

4) Actuator failure rate was 30%.

5) Other aspects, such as failure rate was 5%.

03 classplc multiple points of failure? 1) Relay, contactor.

2) Valves, gate.

3) Switch, limit position, safety protection and site operation of some components or equipment.

4) system of the equipment.

5) Sensors, instrumentation.

6) Power supply, ground wire, and the noise of the signal lines.

4 class maintenance what method is the general table 1

some methods of maintenance of general

05 class maintenance order what kind of? First taken again to

1) Maintenance of , not directly to start work immediately, but ask for failure occurred before and after the situation, the failure phenomenon

2) If the unfamiliar maintenance, should first understand the working principle of the

first clean again

maintenance of , can open the machine, first clean the .

maintenance of inside outside after first, first check the external phenomenon and reason, if the outside is normal, then check that the internal.

without electricity judgment before electricity judgment

in the first place in the absence of electricity, to judge whether the fuse damage, whether electricity can not judge the point of failure. If he can't tell, then again electrify check .

6 classplc system maintenance and troubleshooting process? Overall diagnosis

can find out the fault point according to the overall inspection flow chart of general direction, then gradually thinning to find specific failure.

if the power supply power supply fault diagnosis need for power supply system and power wouldn't light the lamp itself.

power supply is normal running fault diagnosis, operation indicator light is not bright, the system can normal operation is terminated because of some abnormal reason.

1) input/output fault diagnosis Input and output is communication channels with external devices.

2) Input and output is normal work, in addition to related to the input/output unit, also with the connection state of elements such as wiring, terminal blocks, fuse.

7 class to find what is the general steps of failure?

maintenance, a good programmer, and will switch to the RUN position, according to the following steps to find: 1)

If the to stop in some output was the location of the incentive, state ( Place) , is usually somewhere in the middle, then find cause the signal of the next steps, programmer will display ON/OFF state of signals.

2) If the input signal, the programmer shows the status of the LED indicator compared with the input module, if the result is not consistent, then need to replace the input module. Replacement modules before, need to check the I/O extension cable and related links.

3) If the input state LED indicator is consistent with the input module, are light-emitting diodes (oleds) and the state of the input device. If the two different, it is need to measure the input module. If it is found that there is a problem, you may need to replace the I/O devices, field wiring and power supply. Otherwise, the need to change the input module.

4) If there is no output or output signal is the coil, and the state of the coil is different, you need to use the programmer check output drive logic, and check the program list.

5) If the signal is a timer, and stopped in less than 999. 9 a non-zero value, then you need to change the CPU module.

6) If the signal control a counter, you need to check the reset logic control and check the counter signal again. Then check, whether related components abnormal, need to change.

how 08 class maintenance controller common fault?

table 2 maintenance method of controller common faults

how do 09 class according to the change of the indicator lights on the panel to rule out the failure?

table 3 according to the change of the indicator lights on the panel to rule out methods and key points of failure

10 class how to repair some of failure?

maintenance methods and key points of some fault table 4

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