Siemens SIMATIC ET 200S Operating Instructions Manual page 329

2. Monitoring heating process: The error detection/diagnostic function allows you to check
Parameters
The following parameters are required for channel 0 of the 2PULSE to heat a liquid in pulse-
width modulation mode.
Table 5- 2 Parameter List for Heating a Liquid
Parameter
Group diagnostics
Diagnostics DO 0
Response to CPU/master STOP
Mode
Output format
Time base
Function DI 0
On-delay
Minimum pulse duration
Period
The parameters for channel 1 are not relevant in this application example.
Technological Functions
Operating Instructions, 06/2010, A5E00124867-07
via the program that the heating element is being controlled correctly.
Software enable
(SW_ENABLE)
24 V control signal
(DO digital output)
STS_ENABLE
Figure 5-24 Flow Diagram for Heating a Liquid
Set Value
Enable
On
Turn off DO 0
Pulse-width modulation
Per mill
1 ms
Input
0
500
30000
Heating
process starts
Meaning
The following errors trigger a diagnostic message:
Short circuit digital output

Short circuit of the encoder supply

The 2PULSE detects the short circuit error on the digital
output DO 0.
The output value is specified in Per mill (0 to 1000)
All the preset times are specified at a resolution of 1 ms.
The digital input is not required for this application
The 24 V control signal is immediately output with
SW_ENABLE=1
Minimum pulse duration:
This is 500 ms in the selected time base; this also applies
to the minimum interpulse period
This is 30 s in the selected time base
2PULSE
5.7 Application Examples
329