S7Comm node Output operation

[DSongra11_forum.com]

Hello,

I am taking data from Siemens PLC into node-red using the S7comm node.

Reading operation performs perfectly, but not able to write getting error as you can in the screenshot.

Yellow highlight - For Read Operation
Red Highlight - For Write Operation

Br,
Devendra Songra

[Cristiano]

Hello

Can u share more details? what are trying to write? boolean ? db ?

[DSongra11_forum.com]

Hello,

I am trying to write Boolean data for output.

Br,
Devendra

[DSongra11_forum.com]

Hello,

As below error, I am getting while trying to perform a write operation.

Please find node red flow

[{"id":"fc79ac05.92266","type":"inject","z":"9fae712c.a0866","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"true","payloadType":"bool","x":110,"y":94,"wires":[["ba050d00.316df"]]},{"id":"ba050d00.316df","type":"s7comm write","z":"9fae712c.a0866","connection":"22bb055a.e4e8fa","payload":"{\"S7_Type\":\"Q\",\"S7_DBnum\":\"0\",\"S7_Datatype\":\"X\",\"S7_Offset\":\"33\",\"S7_BitOffset\":\"1\",\"S7_Quantity\":\"1\",\"S7_Name\":\"Out\"}","s7Name":"Out","topic":"","name":"","signalSetted":false,"x":360,"y":94,"wires":[["dc07eade.836518"]]},{"id":"dc07eade.836518","type":"debug","z":"9fae712c.a0866","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload.value","targetType":"msg","statusVal":"","statusType":"auto","x":670,"y":94,"wires":[]},{"id":"22bb055a.e4e8fa","type":"s7comm","ip":"192.168.2.1","port":"102","rack":"0","slot":"2","payload":[{"S7_Type":"Q","S7_DBnum":"0","S7_Datatype":"X","S7_Offset":"33","S7_BitOffset":"1","S7_Quantity":"1","S7_Name":"Out"},{"S7_Type":"I","S7_DBnum":"0","S7_Datatype":"B","S7_Offset":"34","S7_BitOffset":"1","S7_Quantity":"1","S7_Name":"In"}]}]

Br,
Devendra Songra

Admin edit, use correct formatting for forum

[MountainKing91]

Can you copy the flow again? There is some error apparently.

Anyway, from the documentation it looks like the payload you want to write must be formatted in a precise way; take a look here:

Hilscher/node-red-contrib-s7comm/blob/master/USAGE.md

[DSongra11_forum.com]

Thanks, MountainKing91 for your support, issue is resolved.

For Writing, I have used the below formats in inject node and the issue is resolved.

for boolean value: {"value":[true]}
for single value: {"value":[1]}
for array value: {"value":[1,2,3]}
for Character value:{"value":["S"]}
for string value:{"value":["Simatic"]}

Br,
Devendra