Here is the RSLINX driver help from Citect:
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Attached some articles from the Citect knowledgebase that might be useful.
But agreed, you could be a bit more specific...
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Fixes from V5.50 on regarding RSLinx:
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* NCR 20109 - CitectSCADA fails to initialize a PLC
If a PLC was turned off, or not on the network at the time the Citect IO servers started, and then became available, when Citect registers its variable tags with RSLinx, RSLinx creates an optimised packet for every tag, instead of a true optimised packet with multiple variables. This caused the CPU utilisation to go to 100% for approximately five minutes, flushed the packets and stopped attempts to read from the PLC. The problem is now resolved.
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* NCR 20599 - OPC driver does not deactivate tags on standby
Unless tags are removed from RSLinx OPC server, they will continue to scan. Driver now implements a new feature which will optionally deactivate all tags.
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NCR 20650 - ABRS Linx devices going offline
A project ran for 49.71 days and then all tasks froze and all PLC devices went offline.. It appeared to have effected the ABRSLinx devices only. The problem is that just before KerRawTime() rolls over, 'pre-empt' will be set to a low value. Then when the conditional statement is executed KerRawTime() will be greater than pre-empt although the Timeout has not elapsed. This causes the Cicode to be prempted and a hardware alarm is raised.