Siemens SIMATIC ET 200AL, System Manual

Page: 1079 / 2255

Alarms
6.5 Example program for program alarms
Diagnostics
Function Manual, 11/2019, A5E03735838-AF
83
6.5 Example program for program alarms
6.5.1 Task
Introduction
This section describes the basic configuration of program alarms with the "Program_Alarm"
instruction based on two examples. The two examples solve the same problem but use a
different approach. Example 1 does not use associated values. In example 2, an associated
value is assigned to the program alarm to reference a text list.
Example - Minimum/maximum fill level of a tank
A tank is filled with a liquid. The fill level is monitored by two sensors.
If the liquid in the tank drops below a minimum fill level, an alarm is output for low fill level.
If the liquid in the tank exceeds a maximum fill level, an alarm is output for high fill level.
Figure 6-5 Example for fill level alarms