TXP CLC Course
Signal TTD
Time-tagged data result as a signal TTD (i.e. exception report) following a
change in status of the input signal (whether binary signal of Process Image
Input Table or simulation value from the Simulation Data Block) if the parameter
TTD is set to “1”.
The following signal TTDs are generated:
•
Change in input signal
•
Channel
is
simulated
•
Channel
is
valid/invalid
A signal connection to the Operating and Monitoring System (OM) must have a
destination ID code defined as YP01 and a destination defined as YP01. The
signal will then be connected to the Archive, Alarm Summary and can be
connected to individual operator graphics.
In addition to selecting a signal to be a TTD, the class of alarm to be generated
can also be selected using the AWT parameter. The following event classes are
available:
E
Event (will not show up in ASD, only in archive)
A
Alarm or trip (notifies operator that something has already tripped)
W
Warning (notifies operator that immediate action needs to be taken)
T
Tolerance (a tolerance limit has been exceeded)
L
Local fault (indicates that a non-critical fault has occurred; i.e. “tank level
high” in the case of automatic tank overflow)
M
Maintenance and service (indicates that a maintenance or service activity
is necessary)
C
Change (indicates a change in status of a pre-defined switching; i.e.
“changeover to spare pump”)
The direction of the TTD to be generated can also be configured using the REV
parameter. With REV set to “0” the TTD will be direct acting, i.e. logic “1” will
generate a TTD. With REV set to “1” the TTD action will be inverted, i.e. a TTD
will be generated on a logic “0”.
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