Inntele

I'd recommend to replace both models with FX5U, that has an Ethernet port onboard. Although in this case the program of A1SCPU should be rewritten to match the addressing, variables and commands of FX5U, it's worth it.

I'm afraid that at current situation just I couldn't help. Three and a half months have passed since the publication of my proposal for your appeal. Now Russia is under sanctions for invading to Ukraine. Russian banks are also under sanctions. As far as I know, the sixth sanctions package, which is to be announced next week, provides for the exclusion of the remaining two banks from the SWIFT settlement system. Systems of transcontinental money transfer have already left Russia. So you just won't be able to pay me this work.

To begin with, it would be right to unravel the tangle by sorting the chains of functions into the corresponding individual functional blocks, which should, firstly, make it possible to figure out how everything was implemented, and, secondly, it would simplify making changes to the program. Theoretically the program can be written from scratch, however I haven't worked with AL2 for a long time so forgot details how to work with buttons and how to organize correctly a storing of setpoint values and their changes by abovementioned buttons. Three components allows to carry out adjustment work remotely: - a person at the facility, which can to connect/disconnect cables, to control the process, to make and send photos and videos; - skype; - team weaver.

It depends on the OPC server and its PLC polling. In real any type of memory cells are available for reading/writing.

If I remember it correctly, that yes, up to 16 slave nodes by computer link protocol. However, I'm warning to build the network using the FX2N-485-BD due to these interface boards has non-isolated RS485 interface, which is correctly to use inside the electrical cabinet only. To use FX2N-485ADP is a right solution.

Hello, What do you mean by "help me"? Should we do this work for you?

@jgar_ I have no original ideas for transferring the program from this PLC model, which run counter to the suggestions of colleagues. Only the alternative option is to write a program from scratch, relying on connection diagrams and detailed work algorithms.  I'm thinking in case of F2-40 it would not so problematic.

@Ron_SThe FX5UG-40MR will be a newer replacement than FX3S-40MR.  http://sg.mitsubishielectric.com/fa/en/download_files/cnt/plc/MELSEC_iQF_Series.pdf https://hoplongtech.com/tailieu/fx5uj-40mt-es

@JS21  Hi, Perhaps I could help your community to solve problems for a modest fee that doesn't bust your budget.

The value of constant K can be mdified by V or Z index register (K0V1 or K0Z1). While easier way is to use D register instead of K constat.

@Ron_S Dear Ron, You are wrong in the sense that only one step can be active in the program scan, an arbitrary number of steps from the available ones can be active. And yet, every step can be in one of three modes: active, passive, zeroing. Regards

Dear Shankar, Due to the rules here is prohited questions about unlocking PLCs closed by password. So you may be banned for it.

Hmm, it sounds a bit strange. The way is present always. Could you, pls, to describe your task in detail and I (we) will try to help you.

Hope, you've already read my post there. If to calculate the current of internal bus supply, +24V is overcurrent... If to connect the 8AD module directly to the PLC base and the FX2N-16EX after that, you'd can disconnect all discrete modules to check the program working. Then you can sequently connect the discrete modules one by one to detect in what stage you get a problem.