| Citect used to fully support redundant
IODevices having different names to the primary IODevices. eg
IODev1_P may be configured as Primary and IODev1_S may be
configured as Standby_Write. As long as the two devices had the
same IODevice Number this was accepted. In Citect V5.20 this
is still supported. However, if you then reference the
standby device, eg in a variable tag form, you will get a compile
error "Unknown IO Device".
To overcome this change in V5.20, modify your variable tags
database to reference primary IO Devices only. This makes no
difference to IO communications as Citect will always communicate
to the Primary device anyway, unless a coms failure occurs on that
device.
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