Hi everyone
I am new to CODESYS and Wago PFC200. I downloaded CODESYS 3.5.8 and PFC200 package manager. I also updated PFC200 package manager.
I need to send and receive data between PFC200 and my slave device through Modbus RTU (RS485).
I added all Modbus Libraries and PFC200 Libraries to my project.
I inserted Modbus_com, Modbus_Master_COM_Port and Modbus_Slave_COM_Port into Devices tree.
But when I login and start CPU, Modbus_Slave_COM_Port does not running.
I also checked COM_Port, and there was no error!!
I attached a screenshot of my project.

Is there any possible solution?!!
Thanks in advance

Hi,
did you change serial mode to rs485 in the plc shell?

BR
Edwin

Hi
Dear Edwin

Thanks a lot for your help. I change serial mode to RS485 in PLCshell succesfully.
Now Modbus_Slave_COM_Port is running. But I have new problems to solve.
first:
I added Modbus_Slave_COM_Port to watch1. Before Modbus_Slave_COM_Port goes to running mode and response success; byModbusError changed between two values: Response_Timeout, Response_Wrong_Slave and m_DeviceState Changed Between: Unknown, Error for about a minute.
I tried to solve this by changing response time but I sow no difference.
Second:
I want to read some values(Start Add:40001, Register Size:2, Type: Float) through RS485. I Think, I have some mistakes adding them to Modbus Slave Channel. the shown values are always 0 and I don't know how to map specific variables.

I will attach screenshots.
Thanks in advance

Hi,

you have two posibilities.
1. Map variables .. give the Name there and use them in PLC_PRG Pou
2. set alway update (this you could use for testing purpose)

BR
Edwin

PS: Moderator should move the Topic to the CODESYS Control Posts!

Hi

Thanks a lot for your time and consideration.
My slave has not running status again and I don't know why this happened!!!
I moved the topic to CODESYS Control Posts.

Thanks again

Hi
Good news
Finally I established a Modbus RTU (RS485) connection and I can read data from slave.
I need data to update online but the problem is that, slave's data updates slowly
I defined timeout responses as 1 second. Still not enough.
Unfortunately adding data length makes updating slower.

Is there any way to boost the update operation?

Thanks in advance

I have done few project with Wago PLC from ECO to PFC, unlikely to tell you that Wago built in Com port always perform in low speed. If you need a good RS485 comport on wago plC, you have to use the wago high-end special com module, or direct go for TCP/IP to com port.