Threshold Value Trigger - Siemens SIMATIC S7-1200 CP 1243-8 IRC Operating Instructions Manual

Configuration
4.18 Data points
Transmission mode
You determine whether ST7 values are sent immediately or following a delay with the
transmission mode of a data point:
● Spontaneous (unsolicited - direct transfer)
The value is transferred immediately.
● Conditional spontaneous (buffered transfer)
The value is transferred only when one of the following conditions is fulfilled:
– The communications partner queries the station.
– The value of another event with the transmission mode "Spontaneous" is transferred.
– The fill level of the send buffer has reached 80 % (TeleControl Basic) or 90 % (ST7) of
4.18.10

Threshold value trigger

Note
Threshold value trigger: Calculation only after "Analog value preprocessing"
Note that the analog value preprocessing is performed before the check for a configured
threshold value and before calculating the threshold value.
This affects the value that is configured for the threshold value trigger.
Note
No Threshold value trigger if Mean value generation is configured
If mean value generation is configured, no threshold value trigger can be configured for the
analog value event involved.
For the time sequence of the analog value preprocessing refer to the section Analog value
preprocessing (Page 152).
Threshold value trigger
Function
If the process value deviates by the amount of the threshold value, the process value is
saved.
Two methods are used to calculate the threshold value deviation:
150
its maximum capacity.
Operating Instructions, 02/2018, C79000-G8976-C385-03
CP 1243-8 IRC