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USAGE.md

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Overview

Function of the S7comm node

The S7comm-Read node sends a reading request to a PLC. The responde from the PLC is at the output of the node available as soon as its arrived.The nodes reads a value from the PLC triggered internally or by an inject node.

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The S7comm-Write node writes a value to the memory of an PLC. The Value is provides either from the inject Node or from a S7comm-Read node.

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Node Status

  • green: connected

    The node is connected with a PLC.

  • red: disconnected

    The node is disconnected.

  • red: error

    Some Error occured.

    Note: The node status connected and disconnected corresponds to the internal state of nodes7 (isoConnectionState). The node status error corresponds to the return value of a read request.

Configuration node

To parametrise the configuration node you have to insert either a S7comm-Read or a S7comm-Write node into the Node-RED editor by dragging it from the list on the left hand side and drop it onto the editor window.

Open Edit Dialog

After double clicking the node you are in the edit dialog of the S7comm node (both nodes are looking nearly the same). The following edit dialog will pop up. Here you can open the Configuration Node.

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Open Configuration Node

The Configuration Node consists of two parts. In the first part you can edit the S7comm-Connection parameter (IP,Port,Rack,Slot). The second part is the signal box. The signal box represents a global list of your PLC. This global list is available for all reading and writing nodes. After creating a global signal list push "Add" to apply the connection parameter and create the list for all S7comm nodes.

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How to define an signal

I0.1:

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IB0 - IB3:

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DB10,DBB0:

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T0:

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Read node

  1. Select an item of the global list you want to read

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  1. Select the repeating mechanism (similar to inject node) In case of choosing the intervall functionallity decide for a repeating time

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  1. Choose a name and a topic for your Node and confirm the node with OK.

Write node

  1. Select an item of the global list you want to write

  2. Choose a name for your node and confirm the node with OK

JSON structures

General structure: The node outputs a msg.payload in the following format to show the read/write command. The value field for the read node shows the reading value. The value Field for the write node shows the writing value!

payload.signal : Symbolic name of the signal as configured,
payload.path  : Signal path of the signal,
payload.error : Error value: 0 = no error, -1 = any error,
payload.value : Read/Written Value as an array

Special definition for payload.value : Read/Written Value within an Array

     null: in case of an error;

     single value: if the quantity equals to one;

     array of values: if the quantity is larger than one;

The message at the output of the node has a defined JSON structures:

Example: { topic: "myTopic", payload: { signal: "myVar", path: "MB0", error:0, value: [42] }, _msgid: "ee4d0428.11b2f8" }

Example payloads for read commands

Reading Q0.1, return value is true and valid:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"Q0.1",error:0, value:[true] }, _msgid: "92e3f0cc.6d1c1" }

Reading QB1, return value is 100 and valid:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"QB1",error:0, value:[100] }, _msgid: "92e3f0cc.6d1c1" }

Reading QB0-QB3, return value is [1,2,3,4] and valid:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"QB0..3",error:0, value:[1,2,3,4] }, _msgid: "92e3f0cc.6d1c1" }

Reading DB11.DBB0 - DB11.DBB3, return value is [null,null,null,null] and invalid because DB11 does not exist:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"DB10,BYTE0..3",error:-1, value:[null,null,null,null] }, _msgid: "92e3f0cc.6d1c1" }

In any case of Error:

error=-1, value=[null]

Example payloads for write commands

Writing true to I0.3, writing succeeded, Error equals to 0:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"I0.3",error:0, value:[true] }, "_msgid": "92e3f0cc.6d1c1" }

Writing 8 to IB1, writing succeeded, Error equals to 0:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"IB1",error:0, value:[8] }, "_msgid": "92e3f0cc.6d1c1" }

Writing [1,2,3] to IB1-IB3, writing succeeded, Error equals to 0:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"IB1..3",error:0, value:[1,2,3]}, _msgid: "92e3f0cc.6d1c1" }

Writing 8 to IB1, Writing failed, Error equals to -1:

{topic:"Input_hall#1", payload:{signal: "machine#1", path:"IB1",error:-1, value:[8]}, _msgid: "92e3f0cc.6d1c2" }

Further information

Hint for usage with S7-1500/1200 type of PLCs:

By default, communications from remote systems such as HMIs, PLCs, OPCs or S7Comm nodes are disabled in the PLC and will be rejected. So make sure you enabled the option "Permit access with PUT/GET communication from remote partner" in Siemens engineering software TIA under the PLC menu item "General/Protection/Connection Mechanism" before using S7Comm node.

Important Note: When using an inject node use following "JSON" formats:

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"]}

Example Flow which connects to an PLC with:

IP-address:192.168.254.234, Port:102, Rack:0, Slot:2


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