Integral Blocks
S5-115U Manual
Temperature sensor
Manipulated variable
Transducer
Actual value
Setpoint
adjuster
Analog input module
(e.g. 6ES5 460)
OB251 with controller DB
(call in OB13)
Y
Analog output
module
(e.g. 6ES5 470)
=
=
W
X
+
Annealing furnace
Channel
1
Channel
0
Control byte (DR11)
IB0
PID control
algorithm
Channel 0
Final control
element
Fuel gas flow
Controlled
system
S5-115U PLC
Figure 11-5. Process Schematic
The analog signals of the setpoint and actual values are converted into corresponding digital
values in each sampling interval (set in OB13). OB251 uses these values to compute the new digital
manipulated variable, from which, in turn, the analog output module generates a corresponding
analog signal. This signal is then forwarded to the controlled system.
11-40
EWA 4NEB 811 6130-02b
Summary of Contents for SIMATIC S5-115U
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