Blocks and Their Functions S5-95F
Table 9-5. Format of the Controller DB (Continued)
Data Word Name Comments
22
24
29
48
X
Z
XZ
YA
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a
Actual value (- 2047 to +2047)
Disturbance variable (- 2047 to +2047)
Derivative time (- 2047 to +2047)
Output variable (- 2047 to +2047)
11
12
STEU
YH
Control word (bit pattern)
Value for manual operation (- 2047 to +2047)
14
16
BGOG
BGUG
Upper limit value (- 2047 to +2047)
Lower limit value (- 2047 to +2047)
All parameters (with the exception of the control word STEU) must be specified as 16-bit fixed point
numbers.
!
Caution
The PID algorithm uses the data words that are not listed in Table 9-5 as auxiliary flags.
Initialization and Call Up of the PID Controller in a STEP 5 Program
Several different PID controllers can be implemented by calling up OB251 repeatedly. A data block
must be initialized prior to each OB251 call up.
Note
Important controller data are stored in the high-order byte of control word DW11 (DL11).
Therefore make sure that only T DR 11/SU D11.0 to D11.7 or RU D 11.0 to D11.7
operations are used to modify user-specific bits in the control word.
9-8
EWA 4NEB 812 6210-02
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