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How to configure the IEC870 protocol for PowerLogic SCADA

Goals and Symptoms

Here is an example for configuring and writing values to DDO data type.

Causes and Fixes

This example is writing to an <IOA> address 200 in the IEC device. While defining the tag address in the project use 2200 (Check project). If you are writing to 100 then 2100 etc..
Steps:

1) Create a variable tag in the Citect project of type DDO.

Tag

2) Add this tag to the IECIOA.DBF with type DDO.
IECIOA.DBF with type DDO
3) Write to the tag. I am using Toggle(Tag1) - to toggle value of the tag.

Info:

- "Double Commands are only ever used for trip/close operations, so only 2 states are valid. Hence they will be treated as Single Digital Output points by CitectSCADA, and translated in the driver. 0 becomes (0,1) (trip), and 1 becomes (1,0) (close).
Regulating Step Commands are similar to Single Commands, except that writing a 0 means next step lower, and 1 means next step higher. "

- Iecioa.dbf file is in the project folder.

- "Note: Output points cannot be read from the Driver by CitectSCADA this reflects the IEC standard, as the protocol does not cater for reading of output points. "

Schneider Electric New Zealand

Attachment(s)
IEC_DDO.zip [120.33 KB]
variable.DBF.dbf [4.88 KB]
Iecioa.dbf [565 Bytes]
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