Error state on device

[abedi]

Hello Mikhail,

I want to read modbus values from a plc using kpmodbus through LAN port.
I can ping the plc ip from computer.
In rapidscada:
a)communication channel type is TCP client, tcp port:502.
b)device call number is set to the computer ip.
c)channel is created.
d) line state is running.

but: device state is: error.

How can I solve this issue?
Thanks a lot for help.

[Mikhail]

Hello,

Please provide a part of communication line log.

[abedi]

2020-07-15 09:16:09 Establish a TCP connection with 172.27.1.210:502
Error establishing TCP connection: No connection could be made because the target machine actively refused it 172.27.1.210:502

2020-07-15 09:16:10 Unable to communicate with Device 1 “wp” because connection is not established

2020-07-15 09:16:11 Attempt to establish TCP connection can not be earlier than 5 seconds after the previous.

2020-07-15 09:16:11 Unable to communicate with Device 1 “wp” because connection is not established

2020-07-15 09:16:11 Attempt to establish TCP connection can not be earlier than 5 seconds after the previous.

2020-07-15 09:16:11 Unable to communicate with Device 1 “wp” because connection is not established

2020-07-15 09:16:11 Attempt to establish TCP connection can not be earlier than 5 seconds after the previous.
…

explanation: server ip: 172.27.1.210
cpu LAN port ip: 172.27.1.211
Thanks

[Mikhail]

Error establishing TCP connection: No connection could be made because the target machine actively refused it 172.27.1.210:502

This message means that the PLC is not available by the IP 172.27.1.210 and port 502.
You should check the PLC.

[abedi]

Thanks for the reply. Do you have any idea that how I can check the PLC? there is no special setting in it. Or shall I change the port? or sth else?

Thanks again.

[abedi]

I tried to check the settings.
The new communication line log:

2020-07-16 14:07:56 Establish a TCP connection with 172.27.1.211:502

2020-07-16 14:07:56 Communication session with the Device 1 “wp”, type: KpModbus, address: 2, call number: 172.27.1.211
Request element group “g1”
Send (12): 00 55 00 00 00 06 02 03 00 00 00 01
2020-07-16 14:07:56 Error communicating with Device 1 “wp”: Error reading data: Timeout can be only be set to ‘System.Threading.Timeout.Infinite’ or a value > 0.
Parameter name: value

2020-07-16 14:07:56 Disconnect from 172.27.1.211

[hicode]

hi,
are you sur that your device adress is good ? i see “2” for you, have you try with 1 ?

[Mikhail]

Timeout can be only be set to ‘System.Threading.Timeout.Infinite’ or a value > 0.

Please make a screenshot of the device properties in Communicator.

[abedi]

Thanks:
The screen shot image link:
https://1drv.ms/u/s!ArUszYM3qWAukCmmsWVLtkTl311D

[Mikhail]

Sorry, I mean:
Open Line 2 Parameters – Request Sequence, select the device 1 and then make a screenshot.

[abedi]

Here is the needed screenshot
https://1drv.ms/u/s!ArUszYM3qWAukCqydeOvfE7HE-lm?e=GyvQrr

[Author]

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