User Manual

Logical I/O blocks
General functions
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Limit monitoring
Blocks: AI, AO, AVAL
In the case of the analog I/O blocks, the present value [PrVal] can be monitored for a high/low limit. If the
alarm monitoring feature is enabled, a deviation alarm is generated after a configurable time period, and
the block status changes to
In Alarm . When the present value is within the limits again and the configured
time period has expired, the alarm and status are reset. There is otherwise no automatic block reaction,
that is, if a switch response in the plant is required as a reaction to this alarm, this response must be
programmed in Xworks Plus (XWP) via the disturbance output [Dstb].
Override via client
The input, output and value blocks can be overridden via BACnet clients or in XWP (CFC) in online test
mode.
User override of an input value