B
Hello!
I am working on a project where I use Wonderware InTouch 9.5 and SMC DASMBSerial DA server to display and log data from several PLCs over MODBUS protocol.
I have one Telemecanique TSX Premium PLC and four Koyo DL-205 PLCs.
The TSX Premium is directly connected to the computer with a serial cable (RS-232),
and the connections with the Koyo PLCs are made via Radio Modems (Satel 3AS) and serial cables (RS-232).
In the SMC configuration I have configured the different PLC locations as Modbus PLC object with the default values in the setup, except the slave addresses of course.
I use COM 1 for the TSX Premium PLC, and COM 3 for the radio modem connection.
The connection seems to work very well, but suddenly the connection to the Koyo PLCs (goes via radio modem) get unstable. When I check the Log Viewer in SMC, it says "Message: failed to verify Modbus RTU frame". The error just comes and goes. For many hours the connection works all fine, then suddenly it breaks down for a while.
The connection to the TSX Premium is doing fine all the time, so it must be something wrong with my setup of the connection who use Radio modem to access the Koyo PLCs.
Can it have something to do with the timeout and polling values? Or maybe the swap register check boxes?
If anyone has an idea how to solve my problem, I will be very happy.
Thanks in advance
Bjorn
I am working on a project where I use Wonderware InTouch 9.5 and SMC DASMBSerial DA server to display and log data from several PLCs over MODBUS protocol.
I have one Telemecanique TSX Premium PLC and four Koyo DL-205 PLCs.
The TSX Premium is directly connected to the computer with a serial cable (RS-232),
and the connections with the Koyo PLCs are made via Radio Modems (Satel 3AS) and serial cables (RS-232).
In the SMC configuration I have configured the different PLC locations as Modbus PLC object with the default values in the setup, except the slave addresses of course.
I use COM 1 for the TSX Premium PLC, and COM 3 for the radio modem connection.
The connection seems to work very well, but suddenly the connection to the Koyo PLCs (goes via radio modem) get unstable. When I check the Log Viewer in SMC, it says "Message: failed to verify Modbus RTU frame". The error just comes and goes. For many hours the connection works all fine, then suddenly it breaks down for a while.
The connection to the TSX Premium is doing fine all the time, so it must be something wrong with my setup of the connection who use Radio modem to access the Koyo PLCs.
Can it have something to do with the timeout and polling values? Or maybe the swap register check boxes?
If anyone has an idea how to solve my problem, I will be very happy.
Thanks in advance
Bjorn