Threshold Value Trigger - Siemens CP 1243-1 Operating Instructions Manual

Resetting the trigger tag in the bit memory area / DB:
If the memory area of a trigger tag is in the bit memory or in a data block, the CP resets
the trigger variable itself to 0 (zero) as soon as the value of the data point has been
transferred. This can take up to 500 milliseconds.
Note
Fast setting of triggers
Triggers must not be set faster than a minimum interval of 500 milliseconds. This also
applies to hardware triggers (input area).
Note
Hardware trigger
You need to reset hardware triggers via the user program
Transferring the value of a data point configured as an event
You specify whether the value of a data point is transferred to the communications partner
immediately after the trigger fires or after a delay in the "Transmission mode" parameter.
Transmission mode
The transmission mode of a frame is set in the "Trigger" tab of the data point. With the
option, you specify whether messages of events are sent immediately or following a delay:
● Immediate transfer - Spontaneous
The value is transferred immediately.
● Buffered transfer - Conditionally spontaneous
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.
4.10.9

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.
CP 1243-1
Operating Instructions, 04/2017, C79000-G8976-C365-03
Configuration
4.10 Data points
101