Letter jie PLC experience sharing, common problems and solving method Industrial control -

At present domestic PLC is given priority to with letter home, mainly summarize the jie letter PLC common problems and solving methods are as follows:

a, why PLC and peripheral equipment to communication? Communication failure generally summarized as the following questions:

1, communication line: connection may not be correct, or poor contact, the user can change the communication line to retry.

2, communication parameters: the communication of PLC communication mouth and peripheral equipment parameter Settings may not be consistent.

3, communication serial port: check communication serial port, can download to check the PLC program, download success is ruled out a serial port.

2, why the letter express XDM series software is not found in the corresponding module models? 1, the old software uninstall, download the new software, again from inside the extension of new software library file is copied down, then unload the new software, and then loaded on the old software, and then copy down the extension of the library file is copied to the old software.

2, because the letter express PLC software and hardware versions must be version corresponding to three, freeform communication

why can't the communication? First check the communication parameter setting is correct, if you are using a serial port communication, 2 will amend the communication mode FD8220 to HFF, FD8221 communication format is set to the corresponding parameters.

4, why high-speed count has access, and the PLC high-speed counter was no data? 1, please confirm whether the current use of PLC with high speed counting light coupling. ( Usually in PLC controller indicated on the label, in addition, before buying please specify needs to take the requirement of high speed counter light coupling)

2, when the user software version is 3. 0, and the hardware version of 2. 5, could lead to can't identify the high-speed counter, at this point, the user can switch to 2. 5 software or hardware upgrade to 3. 0.

note: open the program with the old version may not be successful, the user can be realized by programming statements of copy and paste.

5, any time there is no change in the PLC? Letter jie PLC XC1 series PLC controller with clock.

above references PLC often appear of the problem and corresponding solution, I hope it can help the masses of users.

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