Technical data

6.32 OB 250/251: Closed-Loop Control/ PID Algorithm
You can work with one or more PID controllers in the CPU 928B of
the S5-135U. Each controller must be initialized in the restart
organization block. A data block is used to transfer the parameters.
The actual control algorithm is integrated in the system program and
you can simply call it as an organization block. A data block is used
as the data interface between the control algorithm and the user
program.
6.32.1
Functional Description of
the PID Controller
KRTITD
S3
0
1
Y
dY UL
LL
Auto
1
0
S2
0
W
X
XZ
0
1
S1
XW
dYA (S3 set to 1)
YA (S3 set to 0)
Z
Input of YH when S3 set to 0
Input of dYH when S3 set to 1
S4
P I D
algorithm
Manual input:
Fig. 6-20 Block diagram of the PID controller
OB 250/251: Closed-Loop Control/ PID Algorithm
CPU 928B Programming Guide
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