andbert

The program is running like a dream We have now a fully automatic ventilation program that can implemented in most systems with heating and cooling. The only thing a technician needs to do is adjust the PID values for each different system, which can be done by the HMI system (NS- touchscreen). Just need a few minor adjustment to make it run a little bit smoother... We made an incrementing program with a 0.02 s pulse for each step. n004 = 6 and the program writes to register 0002. Thank you everyone for the help!

The inverters are running on different speeds. Now I'm trying to write a new FB that changes the registers it reads. It starts on D1000 to initialize the first inverter, then D1010 to initialize the second inverter, then D1020 sets the 1st speed and D1030 to set the 2nd speed. This block will count to 4 then reset to 0 so the speed will be updated whenever the value changes. Hope this works If anyone knows a better solution plz post it. I'll post later if it works...

I used your advise ECSI, that worked fine, but does anyone know how to send more than one package? I'm using two inverters so I need to send 4 packages. One each to start the inverters, and one each to set the speed. I've attached the file I use for the modbus communication (CX-Programmer) Modbus_CJ1_RTU_Master_v2.cxp   Modbus_CJ1_RTU_Master_v2.cxp

Yes that was the problem/solution, PMCR.

It work\0/, thank you very much:)

We're using: CJ1M CPU 13 SCU41 RS 485 4-wire Yaskawa V7 (3GMV) We're using modbus. How (where) do we set the speed for the inverter? We can make it go forward/backward, but only at the reference speed. To what register do we have to write so the modbus changes the frequency according to the program?

edit: I found the problem:) Hello I am trying to download Modbus CJ1 RTU Master.psw to the SCU41 using Cx-protocol, but I get this error msg:"aborted download. PMSU is not valid for any of selected protocols". Anyone have any idea what this could be.