I am listing the configurations, hope those who are familiar can verify it for me thanks. This measured time is usually insignificant compared with the actual response time from the PLC. Hi All, I am new to Citect 7. It can automatically scan and find devices if you want it to, and that takes a lot of the configuration out of the way. Sign in Already have an account? Question What is OPC?
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This seems to indicate that the tag address has an incorrect item id, but the correct value has been entered.
It can automatically scan and find devices if you want it to, and that takes a lot of the configuration out of the way. This measured time is usually insignificant cjtect with the actual response time from the PLC.
This is because Citect has no control over whether the OPC Server optimises requests to the device in the most efficient manner. Answer When Citect reads tags from a PLC, it is sometimes quicker to request a block of tags which includes several of those needed by Citect.
That the OPC Server can connect to the end devices. Question I have a customer who tries to connect to an OPC Server and they always get the error. Is there any possibility to use the Access path in Citect? Register a new account.
Citect OPC Client Connecting – HMI & SCADA –
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How to connect an OPC client to your multi-cluster SCADA project
This is because each request has a specific overhead in time independent of how many tags are being requested, so by making one larger request instead of many smaller requests reduces the average overhead per tag. It’s available as a free 30 day demo here: See KB Article Q You could use it to connect to the OPC Server and verify: As I said earlier these settings worked for OUR project in version 6.
That your tag syntax is correct Note: As Citect cannot block individual requests when using tag names to access the tags values, each Citect Client citsct request each tag individually across the network. Hi All, I am new to Citect 7.
OPC Explorer is not a replacement for Citect, it’s just used for testing.
Citect OPC Client Connecting
It may be that an OPC Server allows items to be specified in a format similar to the native addressing format of the device, though this is not necessarily the case.
This will signifcantly load the network and have a corresponding affect on the performance of the Citect system as a whole. I am not sure if i got all the configurations right for my citect portion. While the exception reporting nature between the Citect OPC Client and the Server reduces or negates this concern at this point, performance may still be degraded at two places: Some frequently asked questions are listed below.
We have a large project in version 6. Sign In Sign Up. Question What is OPC? Answer The Access Path is a server specific option that is intended to allow the client to provide a ‘recommendation’ to the server regarding how to get to the data. The OPC specification isn’t exactly clear as to whether it is legal for the OPC Server calls to fail if an access path is not specified, but it does go as far as saying that by “convention” a server should select an access path if one is not provided.
Question The OPC specification uses tag names rather than physical addressing to request the value of a tag. With this in mind, Ci Technologies suggest that an OPC Server should handle the case where an access path is not specified. They may not even be available or may not be required in version 7.