Modbus TCP WAGO binding

Add-ons Bindings
1

Hello
(I think I read many post but wasn’t able to solve yet)
I’m tryong to connect to my WAGO 750-842 via modbus. Via software like “Modbus Poll” I can access my coils and read and write to them (FC 1 and 5 rispectively)

My openhab.cfg is:

modbus:tcp.slave1.connection=192.168.0.10:502
modbus:tcp.slave1.id=1
modbus:tcp.slave1.type=coil
modbus:tcp.slave1.start=514
modbus:tcp.slave1.length=8

Here my demo.items:

Switch MySwitch0 “My Modbus Switch0” (ALL) {modbus=“slave1:0”}
Switch MySwitch1 “My Modbus Switch1” (ALL) {modbus=“slave1:1”}
Switch MySwitch2 “My Modbus Switch2” (ALL) {modbus=“slave1:2”}
Switch MySwitch3 “My Modbus Switch3” (ALL) {modbus=“slave1:3”}
Switch MySwitch4 “My Modbus Switch4” (ALL) {modbus=“slave1:4”}

The demo.sitemap:

Switch item=MySwitch0 label=“modbus=slave1:0”
Switch item=MySwitch1 label=“modbus=slave1:1”
Switch item=MySwitch2 label=“modbus=slave1:2”
Switch item=MySwitch3 label=“modbus=slave1:3”
Switch item=MySwitch4 label=“modbus=slave1:4”

And here my log:

22:48:12.844 [DEBUG] [modbus.internal.ModbusTcpSlave:68 ] - ModbusSlave: Error
connecting to master: Connection timed out: connect
22:48:12.844 [INFO ] [.b.modbus.internal.ModbusSlave:262 ] - ModbusSlave not co
nnected

Here the log when I turn on/off the switches on the GUI:

22:51:05.979 [INFO ] [runtime.busevents :22 ] - MySwitch0 received
command OFF
22:51:07.274 [INFO ] [runtime.busevents :22 ] - MySwitch1 received
command OFF

If someone has suggestions … thank you !

2

Here is an example of mine for different devices. you might want to make sure the port and ip address are correct.

modbus:poll=1000

modbus:tcp.slave1.connection=192.168.1.200:502:rtu
modbus:tcp.slave1.type=holding
modbus:tcp.slave1.start=39
modbus:tcp.slave1.length=1
#modbus:tcp.slave1.valuetype=uint16

#ADAM 6060 12-Channel Digital I/O Module
modbus:tcp.slave2.connection=192.168.1.106:502
modbus:tcp.slave2.type=coil
modbus:tcp.slave2.start=16
modbus:tcp.slave2.length=6
modbus:tcp.slave2.valuetype=bit
modbus:tcp.slave3.connection=192.168.1.106:502
modbus:tcp.slave3.type=discrete
modbus:tcp.slave3.start=0
modbus:tcp.slave3.length=5
modbus:tcp.slave3.valuetype=bit
modbus:tcp.slave5.connection=192.168.1.106:502
modbus:tcp.slave5.type=input
modbus:tcp.slave5.start=0
modbus:tcp.slave5.length=2
#modbus:tcp.slave5.valuetype=bit


#ADAM 6024 12-Channel Universal I/O Module
modbus:tcp.slave4.connection=192.168.1.105:502
modbus:tcp.slave4.type=input
modbus:tcp.slave4.start=0
modbus:tcp.slave4.length=6

#Watlow F4
modbus:tcp.slave6.connection=192.168.1.104:502
modbus:tcp.slave6.type=input
modbus:tcp.slave6.start=100
modbus:tcp.slave6.length=16
modbus:tcp.slave7.connection=192.168.1.104:502
modbus:tcp.slave7.type=input
modbus:tcp.slave7.start=200
modbus:tcp.slave7.length=64
modbus:tcp.slave8.connection=192.168.1.104:502
modbus:tcp.slave8.type=holding
modbus:tcp.slave8.start=300
modbus:tcp.slave8.length=64
3

Hello David,
thank you for your reply.

About the IP address, no doubt about it.

Can the port for modbus over tcp be different than 502 ? So far I’ve found that only 502 is used for modbus around (even if scanning the PLC I found only the port 80 open).

It would be helpful for me if you (or someone else)would have some suggestions for debugging …

Thanks and regards

Lorenzo

4

what happens when you point your web browser to the module ip address? it should give you a status page.

5

Hello !

seems I got the connection.

I’m using now the following .cfg:

modbus:tcp.slave1.connection=192.168.0.10:502:rtu
modbus:tcp.slave1.id=1
modbus:tcp.slave1.type=coil
modbus:tcp.slave1.start=512
modbus:tcp.slave1.length=8

The only difference is the :rtu at the end of .connection

Thank you David for your time.

6

Hi David,
do you have some modbus config for PoKeys57E device?

Thank you.
Frantisek