How to bit-pack 16 bits into a SCADAPack x70 analog object associated with a Modbus holding register
When using SCADAPack x70 devices, it may be desirable to pack 16 bits into a Modbus holding register. This is typically wanted when the SCADAPack is acting as a Modbus Server. When using RemoteConnect, all protocol facing values need to be in “objects” in the SCADAPack database.
Logic:
If you need to pack 16 bits into a Modbus holding register, a user will create an object associated with a Modbus address. The Logic Variable Type will be “T_SPx70_UINT”.
In the logic editor, the user will use a combination of “BIT_TO_WORD” and “WORD_TO_UINT” function blocks. The inputs to the “BIT_TO_WORD” block can be a combination of Elementary variables and Derived variables that are part of the x70 object database.
Below are visual examples of the objects and logic needed to bit-pack an object with up to 16 bits. The 16 bits will be available in Modbus register 40001 (object ModbusBitPack). Any SCADA/RTU/PLC client can poll for Modbus register 40001 and get the bit-packed value.
Gepubliceerd voor: Schneider Electric Belgium
Hulp nodig?
Selecteer zelf het juiste product
Vind snel en eenvoudig de juiste producten en toebehoren voor uw toepassingen.
Offerte aanvragen
Dien uw aanvraag online in en een expert zal contact met u opnemen.
Verkooppunten
Vind eenvoudig de dichtstbijzijnde distributeur van Schneider Electric op uw locatie.
Help Center
Vind de antwoorden die u nodig heeft via bladeren door veelgestelde vragen over onderwerpen.