Hitachi Software Plc
Hello, can anybody help me on how to communicate the v350 PLC to VFD Hitachi X200 via MODBUS?attached is our program for the vfd in visilogicplease help if you have an idea about this matter. Thank you in advance!!Mr. Ausman, you are right, we want the PLC v350 to be the master, but the problem is we cant communicate the PLC with the Hitachi x200, ived already checked what you asked me to do but the model which you are reffering to is v130, i think its different from v350 right? By the way thank you for responding. All Vision PLCs work the same way when it comes to Modbus, so the ladder code in the V130 example will work in the V350.Typically the Modbus master is using the RHR #3 (read holding registers) and PHR #16 (preset holding registers) commands when talking to a slave such as a VFD. The picture of your code uses function #8 Loopback Test, which isn't going to do anything except prove the PLC can talk to itself.Post your actual PLC program and a link to the Hitachi x200 communication reference containing the Modbus register table.Joe T. All Vision PLCs work the same way when it comes to Modbus, so the ladder code in the V130 example will work in the V350.Typically the Modbus master is using the RHR #3 (read holding registers) and PHR #16 (preset holding registers) commands when talking to a slave such as a VFD.
The picture of your code uses function #8 Loopback Test, which isn't going to do anything except prove the PLC can talk to itself.Post your actual PLC program and a link to the Hitachi x200 communication reference containing the Modbus register table.Joe T.mr. Joe what can you suggest to do for it to work? Thank you for responding.
Industrial Plc
Drawn the painted tower download. The Modbus section is in appendix B. Please verify that you have set the switches and parameters according to pages B-1 to B-5.Verify that you have the jumpers on the V350 set to RS485 as outlined in the V350 Installation guide.Tell us what the VFD slave ID is set to (C072) and verify your serial cable connection - the drive is an RJ45 8 pin and the PLC is an RJ11 6 pin. Pin 5 of the VFD cable should go to pin 1 of the PLC cable, and pin 6 of the VFD cable should go to pin 6 of the PLC cable. The jumpers and PLC cable diagram are on page 7 and 8 of the V350 Installation guide.Then tell us exactly what you want the PLC to tell the drive. Referencing pages and commands in the Hitachi manual would be helpful.Joe T. You dont need MB 3,Set VFD params 19200 Baud,8 data,None Parity,1 Stop.PLC must be a master for control VFD.Dont use 'SCANEX'.You must set a 'Write-Read' networks.İF PLC writing cant read same time.Mr. Joe right,first you must read VFD actual freq.
Omron Plc
And you must use 'Modbus = Read Holding Register', keep in mind PLC cannot write simultaneously while reading.When you wanna write freq. VFD you must use 'Modbus = Preset Holding Register'.For Read-Writing addresses you must look manual of VFD,and sometimes we may need to make parameter settings via the drive.In communication parameters, the driver requests a Modbus address assignment.It's really enjoyable, but it's a tough subject.It's a good idea to go step by step.