Siemens SIMATIC ET 200S Operating Instructions Manual page 296

2PULSE
5.4 Application Examples
Sequence
1. Starting heating process: To start the heating process, use the software enable
2. Monitoring heating process: The error detection/diagnostic function allows you to check
Software enable
(SW_ENABLE)
24 V control signal
(DO digital output)
STS_ENABLE
Figure 5-20
296
(SW_ENABLE) in your control program.
via the program that the heating element is being controlled correctly.
Heating
process starts
Flow Diagram for Heating a Liquid
Technological Functions
Operating Instructions, 02/2007, A5E00124867-05