Tyre crane cart can't move, because PLC error - download the program version Simulation technology -

background: due to the green environmental protection requirements, a few years ago to diesel engine driven tyre crane to carry on the oil change electric technical transformation, namely use mains power supply in the field, to use diesel engine power supply. So on both sides of the cart with two PLC controller electrical site, on both sides will take the electric car state after the acquisition by ET200M transfer to the main PLC controller ( S7- 400). 。 Walking cart not to avoid sliding contact line ( Feeding device) Collision, take some limit set on electric car, through a series of limit state interlocking control cart movement.

process: one day, the scene at a tyre crane cart can't move, the scene view cart on the side of the control enclosure ET200M BF lamp in flash a red light, normally on BF on one side of the light is red. Preliminary judgment is communication failure, namely the following screen: 1, change on both sides of the plug and the main PLC controller communication, 2, replace ET200M module, all cannot be ruled out of failure.

the suspect program appear problem, will increase after technical renovation the site not to join the cause, HRADWARES in the viewer, as shown in the figure below: fault machine DP site three fewer than in the normal machine DP site, so you can judge the program version.

result: the recent backup program copy after download and install the troubleshooting. Later learned that the cause of the problem is when making industrial update, took a long time ago as in program download program to use.

graph: fault machine hardware site

graph: normal machine hardware site

make electrical and automation, deal with failure, to discover the characteristics of different fault, good at summarizing. There is work carefully is very important.

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