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Citect String Array Tags

Lou

Trying to make a variable String Array tag to link to an OPC Server.

Setup a STRING Variable to look at a specific index (the addressing scheme for the Opto22 OPC allows this type of selection) without the !A[x] suffix used make it a string array tag. Was able to read/write the contents of this index. Note this was a long text string which worked fine. Addressing schemes for other string arrays do not allow individual index selection.

 If I use the !A[X] suffix on the address string (which works on Integer and Float Arrays) not only doesn’t it work but the IOServer crashes if I try to read a specific index.

Any insight to creating String Array tags that work would be greatly appreciated. FYI using CitectScada 7.50 (2015)

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  • I was able to read/write to an OPC String Array via a simple OPC Test Client, so it should work via any OPC client (ie. CitectScada).

    As I noted I was able to setup a String Tag to read/write an individual index of the OPC String Array because the Address Scheme allowed selection of individual indexes.

    The problem is trying to bring in a String Array / Table (using the !A[x] suffix in the address) when the addressing scheme doesn't allow individual indexes to be called out. Monitoring my OPC Server it does appear that Citect does setup (in the OPC Server) that we are monitoring the String Array. Unfortunately reading or writing to the index either gives me BAD status or crashes the IOServer.

    Any other insight or experience in setting up string arrays would be appreciated.
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  • I was able to read/write to an OPC String Array via a simple OPC Test Client, so it should work via any OPC client (ie. CitectScada).

    As I noted I was able to setup a String Tag to read/write an individual index of the OPC String Array because the Address Scheme allowed selection of individual indexes.

    The problem is trying to bring in a String Array / Table (using the !A[x] suffix in the address) when the addressing scheme doesn't allow individual indexes to be called out. Monitoring my OPC Server it does appear that Citect does setup (in the OPC Server) that we are monitoring the String Array. Unfortunately reading or writing to the index either gives me BAD status or crashes the IOServer.

    Any other insight or experience in setting up string arrays would be appreciated.
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