Technical data

Structure of the transfer data
block
Addr.
in DB
Name I/O
1)
Nume-
rical
format
2)
PG
format
3)
Remarks
DW0 — — — — Reserve
DD 1 K I FLP KG Proportional cooefficient
K >0: Positive control direction, i.e.
change of actual value and
manipulated variable in same direction
K <0: Negative control direction, floating point
number range
DD 3 R I FLP KG R parameter, usually equals 1 for controllers with P
action
DD 5 TI I FLP KG TI = TA/TN
DD 7 TD I FLP KG TD = TV/TA
DD 9 W
k
I FLP KG Setpoint input here, when control bit 6 = 1,
otherwise in word no. 19 (-1
≤W
k
<1)
DW11 STEU I FLP KM Control word
DD 12 YH
k
I FLP KG Manual input here, when control bit 6 = 1; otherwise
in word no. 18 (-1
≤YH
k
<1)
For velocity algorithms, you must specifiy manipulated
variable increments here
DD14 ULV I FLP KG Upper limit value
4)
-1 ≤ ULV ≤ 1 (YA
k max
);
!! LLV < ULV !!
DD 16 LLV I FLP KG Lower limit value
4)
-1 ≤ LLV ≤ 1 (YA
k min
)
DW18 YH
k
I NF KF Manual input here, when control bit 6 = 0
(-1
≤ YH < 1). For velocity algorithms, you must
specify manipulated variable increments here
DW19 W
k
I NF KF Setpoint input here, when control bit 6 = 0
(-1
≤ W
k
< 1)
DW 20 MERK I BP KM Bit 0 = 1: positive limit exceeded;
Bit 1 = 1: below negative limit
DW 21 X
k
I NF KF Actual value input for control bit 7 = 0
(-1
≤X
k
<1)
DD 22 X
k
I FLP KG Actual value input for control bit 7 = 1
(-1
≤X
k
<1)
DW 24 Z
k
INF KF
Disturbance (-1
≤Z
k
<1)
DD 25 Z
k
I FLP KG Disturbance input here, if
control bit 7 = 1 (-1
≤Z
k
<1)
Table 6-10 Transferring the data block for PID control
OB 250/251: Closed-Loop Control/ PID Algorithm
CPU 928B Programming Guide
6 - 114 C79000-B8576-C898-01