Siemens CP 1242-7 GPRS V2 - Trigger Tab

Configuration and operation
4.9 STEP 7 configuration
CP 1242-7 GPRS V2
Operating Instructions, 10/2016, C79000-G8976-C311-02
73
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Event trigger
The value of the data point is transferred when a configurable trigger signal is fired. As
the trigger signal, the edge change (0 → 1) of a trigger bit is evaluated that is set by the
user program. When necessary, a separate trigger bit can be configured for each data
point.
Resetting the trigger tag in the bit memory area / DB:
If the memory area of the trigger tag is in the bit memory or in a data block, the trigger tag
is reset to zero when the data point value is transferred.
Transmission time of the frame (Transmission mode)
Whether the value of a data point is transferred to the communications partner immediately
after the trigger fires or after a delay depends on the setting of the parameter "Transmission
mode" in the "Trigger" tab of the data point:
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Spontaneous
The value is transferred immediately.
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Conditional spontaneous
The value is transferred only when one of the two following conditions is fulfilled:
– The telecontrol server queries the station.
– The value of another event with the transmission mode "Unsolicited" is transferred.
4.9.7.7
"Trigger“ tab
Trigger
Data points are configured as a static value or as an event using the "Type of transmission"
parameter:
Saving the value of a data point configured as an event
Saving the value of a data point configured as an event in the send buffer (message
memory) can be triggered by various trigger types:
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Threshold value trigger
The value of the data point is saved when this reaches a certain threshold. The threshold
is calculated as the difference compared with the last stored value, refer to the section
Threshold value trigger (Page 74).
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Time trigger
The value of the data point is saved at configurable intervals or at a specific time of day.
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Event trigger (Trigger tag)
The value of the data point is saved when a configurable trigger signal is fired. For the
trigger signal, the edge change (0 → 1) of a trigger tag is evaluated that is set by the user
program. When necessary, a separate trigger tag can be configured for each data point.