Siemens SIMATIC ET 200AL, System Manual

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Alarms
6.1 Creating alarms with the "Program_Alarm" instruction
Diagnostics
Function Manual, 11/2019, A5E03735838-AF
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6.1 Creating alarms with the "Program_Alarm" instruction
"Program_Alarm" instruction
You create a program alarm in STEP 7 with the "Program_Alarm" instruction.
The figure below shows the "Program_Alarm" instruction with the most important input tags.
①
The "Program_Alarm" instruction monitors the signal at the SIG block input and generates a
program alarm in case of a signal change at the SIG parameter. The instruction generates an
incoming alarm when the signal changes from 0 to 1 and an outgoing program alarm if the
signal changes from 1 to 0. The program alarm is triggered synchronously to program execu-
tion.
②
The time stamp is automatically created when the alarm event occurs in the automation system
and is passed along with the alarm.
③
You can append up to ten associated values to the program alarm at the parameters SD_i (1 ≤
i ≤ 10). The associated values are acquired at the time of the signal change at the SIG parame-
ter and assigned to the program alarm.
Associated values are used to display dynamic contents in alarms.
Example: The temperature in the tank <associated value 1> is <associated value 2> °C.
You can find more information on associated values in the STEP 7 online help.
Figure 6-1 "Program_Alarm" instruction