It is possible that Modbus Poll can convert between the listed formats as well, the application’s manual can provide information about it. When I use function code 06(write single register) I don't have errors but I don't receive anything on PLC.Īlso, I tried to change in Modbus poll to PLC address(base1) but received same errors.Ĭan you please give me some advice? If anything else is needed let me know so I will post it later. Modbus Poll Registration Key If you are a slave developer, you can create and upload your own test strings in the Test Center and check the slave result. According to our registry, Modbus Poll is capable of opening the files listed below. The program uses the multiwindow mode for convenient. Or "Insufficient bytes received" when trying to read from more then one address. Modbus Poll is a simulator designed specifically for testing the Modbus protocol in Slave devices. When I use function code 03, TxD and RxD on Moxa connector are blinking, but only RxD is blinking on CM1241, and I receive error "Checksum error" when trying to write on only one address. Settings of Modbus poll software can be found in attachment. I am using Moxa 1150 with DB9 connector to connect PLC with PC.
Now, I want to test communication additionally with Modbus poll software on PLC. (parts of program for MODBUS communication can be found in attachment)
In order to test communication I used second PLC as Master, and everything WORKED well.
According to example programs on forum I made program for Modbus communication for slave S1200 (6ES7 214-1AG40-0XB0) and communication board CB1241 (6ES7 241-1CH30-1XB0) using TIA (Version V13 SP1 Update 9). The Maximum polling values for Modbus RTU and Modbus TCP are the following.