Table of Contents
Advertisement
Integral Blocks
IB0
+
Channel 0
Channel 1
Setpoint adjuster
Analog input module
(e.g. 6ES5 460)
Actual value
=
=
Transducer
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
Control byte (DR11)
W
PID control
algorithm
X
OB251 with controller DB
(call in OB13)
Temperature sensor
Annealing furnace
Figure 11-5. Process Schematic
Manipulated variable
Y
Channel 0
Analog output
module
(e.g. 6ES5 470)
Fuel gas flow
EWA 4NEB 811 6130-02b
S5-115U Manual
S5-115U PLC
Controlled
system
Final control
element
Advertisement
Table of Contents
