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[Imported] Problem with read/write variable in Workbench and modbus

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[Imported] Problem with read/write variable in Workbench and modbus

>>Message imported from previous forum - Category:SCADAPack RTU<<
User: mchartrand, originally posted: 2018-10-18 19:37:10 Id:133
This is a re-posting from the obsoleted (October 2018) "Schneider Electric Telemetry & SCADA" forum.

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**_Josdn:
I'm trying to read and write a variable via modbus to a point in the ScadaPack. In E-configurator I'm configuring a 32bit analog point which is mapped to a Modbus address. This same point is also used in my Workbench application, configured as an IO Device as RTU_RAW_WRITE. The problem I'm having is that the workbench seems to have only read access or write access, not read/write. If I configure a variable to be VarInput then it can't be writen in the program, and if I configure a variable as a VarOutput then the devices that access this point via Modbus can't write on it. How can I configure the point to be read/write?_**

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bevanweiss:
In ISaGRAF/SCADAPack Workbench essentially you can't.

For what you want to do, I would recommend the following:
a) Configure the IO Device (In SCADAPack Workbench) as an Input (or as an output status)
b) Use the OPERATE instruction anytime you want to force change the value

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**_Josdn:
Thanks, I'm going to try this solution._**