Couldnt read data from Autonics ARIO-C-MR using PLC WAGO Edge Controller through Modbus RTU RS485

CODESYS
, ,
1

Hello, can somebody help me. I try to read data from sensors using Codesys 3.5 which are connected to I/O module using PLC WAGO Edge Controller. They are connected through Modbus RTU RS485.

utQuery : typMbQuery := ( bUnitId := 1, // Slaveaddress
bFunctionCode := 16#04, // read input registers
IIdentifyObject := myBaseIdentification, // only needed for FC43
uiReadAddress := 2000, // Startaddress
uiReadQuantity := 10, // Quantity of wanted registers
uiWriteAddress := 0, // not needed for FC4
uiWriteQuantity := 0, // not needed for FC4
awWriteData := [124(0)] // not needed for FC4
);

Unfortunately, i couldnt get the data but when i tried using modbus poll, the data can be displayed. Thank you for your help.

2

Hello, have you tried using the Modbus configurator?

image
image1614×467 29.9 KB

3

Hi, sorry for the late reply. The problem has been solved. It seems that the main problem is the cable RS485. After we change the cable, the data can be read.