Rodney

You must give much more information in order that we can assist you in achieving your goal of writing your code. Rodney

But in that case why use a data register

The two PLCs have different software and different programming cables. So you cannot take the program from the 300 PLC and put it into the 200 PLC. You require Simatic S7 software and a MPI cable for the 300 PLC. For the 200 PLC you require Micro Win software and a PPI cable. So you upload the program from 300 PLC and rewrite the program with the Micro Win software and download it to the 200 PLC. Not knowing the machinery or the application it may not be as simple as l have suggested however both of these machines must have worked in the past so it must be possible.  Good luck Rodney   

If it does not appear anywhere in the program then how could it be latched.

Is there a HMI or a Scada connected  to the to the PLC. D435 is a data register and can receive a value from these devices.  Rodney

Hi AmirB As l said in my post the cable you have will not work. You require a cable from Mitsubishi SC09 this cable has electronics in it that.   converts the RS232 signal coming from your computer. To RS485/RS422 that your PLC uses when reading and writing to your         computer. As gambit said in his post if you have USB available on your computer you can buy a USB version that would work. But the simple way wold be to get the SC09 cable. good luck  Rodney   

A serial cable will not work you have to use a Mitsubishi SC09 cable. The PLC is not RS232 the SC09 cable converts the RS232 to RS485 or RS422 l don’t remember of hand. You can bye these from EBay but be carful of some of the sites ideally try to get a genuine cable which is an orange coloured one. Rodney  

It is against the terms of service on this forum to discuss cracking of passwords.

Baub  l have just noticed you have not used the inputs in the sequence as you did in your previous sequence. Rodney  

Regarding your sequence Q100.0 will you be using this as an indication that the sequence is running ie a run lamp. If not you can use a internal flag so as to not waste a actual output. Also you require a cancel flag for T1,T2,T3 and T4. The way it is programmed T1,T2,T3 and T4 once they energise they cannot turn off. Rodney  

That would depend on the valves operating the system. If the valves are single acting then when the valve would return when de-energised. However double acting would require a return signal. This would depend on which operation is required. Rodney

You have written the sequence of how you want the process to function. Now you should just put that sequence into your program. Have a go and we can give you helpful advice. Rodney

Have you tried to connect to the P.L.C with your software and cable.     Rodney

You do possibly have a lifeline that the program is stored on a eprom. If you remove the front cover the middle part on the front there maybe an eprom.  Good luck Rod Strick 

Switch the selector to run