<8. Detailed Description>
PV1
PV2
AI1
AI2
Regulatory control
of analog signals
Calculations and
conditional decisions
NPAS_PVI_2
NPAS_PVI_1
PV1
PV2
Signal B
difference = | PV1 - PV2 |
If mode = “a”
If difference ≥ preset value, turn on signal A
If mode = “b”
If difference ≥ preset value, turn on signal B
Signal A
Create a user function block containing the
calculations and conditional decisions coded in ST,
and combine it with FBD or LD.
User function block
In this way, calculation and conditional decision application parts, for which FBD and
LD are not suited, are created in ST and then registered as user function blocks so
that ST can be combined with FBD or LD to create an easily comprehensible
application.
SEE ALSO
For details on user function blocks, see Section 4.7, “Application Encapsulation.”
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