Modbus poll read error
#Modbus poll read error code#
Result code -11 occurs when the data logger is unable to open the COM port specified. Try requesting all of the registers together.
![modbus poll read error modbus poll read error](https://i.stack.imgur.com/vHXEA.jpg)
The result is that the device will report an error when you try selectively polling registers. Instead, they are hard coded to respond to certain Modbus messages. Some devices do not fully implement parsing Modbus commands. With 32-bit data types, it requests twice as many registers as the length.Īn uncommon cause for the -02 result is a device with an incomplete implementation of Modbus. The ModbusClient() instruction uses length as the number of values to poll. Also, too long of a length can trigger this error. Refer to the earlier section about register number and consult the device documentation for support information. One possibility, is a mistake in your program on the starting register number. The illegal data address error occurs if the server rejects the combination of starting register and length used. Instead, they are hardcoded to respond to certain Modbus messages. It is common for devices to have holding registers where read-only and read/write registers are mapped next to each other.Īn uncommon cause for the -01 result is a device with an incomplete implementation of Modbus.
![modbus poll read error modbus poll read error](https://user-images.githubusercontent.com/44410959/58751792-f9e5b180-8479-11e9-88a0-77cff235d7bf.png)
If the function code is supported, make sure you are not trying to write to a register labeled as read-only. Different devices support different functions (consult the device documentation). The illegal function error is reported back by a Modbus server when either it does not support the function at all, or does not support that function code on the requested registers. A positive result code indicates no response was received. ModbusClient() displays these codes as a negative number. Modbus defines several error codes, which are reported back to a client from a server. Further information on Modbus can be found at: Whether you are connecting via Modbus to a solar inverter, power meter, or flow meter, the information provided here can help you overcome the challenges, and successfully gather data into a Campbell data logger. 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.Most of the difficulties with Modbus communications arise from deviations from the standards, which are not enforced within Modbus. 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.
#Modbus poll read error software#
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.
![modbus poll read error modbus poll read error](https://crackeygenpatch.com/wp-content/uploads/2021/09/Modbus-Poll-Crack-2021.jpg)
(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 read error 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).