Has anyone had any experience with these 1769-SM2 Modbus/RTU cards 2.
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. After doing some research most of our Modbus filed devices are Modbus RTU & some sites already have a 1769-sm2 PLC card installed, I called Anybus tech support and there device will not work with our setup because our devices are not Modbus/TCP and are PLC are not V21 or higher. Or "Insufficient bytes received" when trying to read from more then one address. 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. If the Modbus master cannot poll your modbus slave, then neither will the AB PLC. Settings of Modbus poll software can be found in attachment. In such cases I always ENABLE A MODBUS/TCP master and confirm you can use some tool (like ModScan32) to poll the Modbus serial slave BEFORE goofing around with the AB PLC. 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).
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