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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. 8.2.1: Modbus/TCP to RTU Bridge Setup Default Settings. 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. Settings of Modbus poll software can be found in attachment. 'read register' or 'write register'), the data, and a check sum (LRC or CRC). A MODBUS message sent from a master to a slave contains the address of the slave, the 'command' (e.g. I am using Moxa 1150 with DB9 connector to connect PLC with PC. MODBUS Protocol is a messaging structure, widely used to establish master-slave communication between intelligent devices. 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.
#Modbus poll response 2554 update
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).