PLC design should pay attention to safety problems

If you have the original program, you as long as the PLC memory to eliminate all can. Removal method is as follows: 1. If you use a handheld program writing device when writing device connected to the PLC after choosing the ONLINE mode, press the GO button, the screen will require you to enter a password, please press SP eight times, at this time to press the GO button three times, so that your state of PLC will return to factory, you can be as long as the original program into the PLC controller again. 2. If you use FXN, DOS version V2. 0 or more versions of the software in the MODE of Windows 7,5,3, then in the picture options, above, the key to choose 'the MEMORY ALL the CLEAR' and press 'Enter' key, so, PLC internal MEMORY will ALL be cleared. The user will original program into the PLC controller again can. 3. If you use FXN Windows version V1. , after the jump out of the new picture, will all three options are selected, then press 'Enter' key, images will appear 'determine' and 'cancel' two choice allows you to make a decision, at this time, choose 'ok', then press 'Enter' key. If the screen disappeared, also said the PLC has to return to the factory, you can write program again.
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