Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 73)

Programming
Chapter 3
3Ć30
Figure 3.8
Expanded Control Word, Loop 1 W30 and Loop 2 W50
1
0
Loop 1
1
0
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
1
0
1
0
W30
Loop 2
W50
FFI1
FFI2
Note: If you change a loop 1 or loop 2
parameter, you must initiate a load/enter sequence
SCALE
PV1
SCALE
PV2
SCALE
SP1
SCALE
SP2
SCALE
ERROR1
SCALE
ERROR2
DECOUPLE
0
TIEBACK
FFI1
PC
TIEBACK
FFI2
PC
NEG.
FFI1
POS.
NEG.
FFI2
POS.
[FFI+FF0]
[FFI+FF0]
MULTIPLIER
FOR
MULTIPLIER
FOR
LEAD/LAG
LEAD/LAG
(-)
SMIN1
(+)
(-)
SMIN2
(+)
(-)
(+)
(-)
SMAX2
(+)
SMAX1
PC
PID
BIAS1
PC
PID
BIAS2
NEG.
POS.
BIAS1
NEG.
POS.
BIAS2
CASCADE
LP1 TO
SP LP2
0
W30(W50) B07,06 Multiplier for K
F
34(W54)
0 0 K
F
x1
0 1 K
F
/10
1 0 K
F
x10
1 1 K
F
x100
W30(W50) B05 1=Enabel lead/lag W35,36 (W55,W56)
0=No lead/lag
W30(W50) B04 1=Negative value for SMIN W31(W51)
0=Positive value for SMIN
W30(W50) B03 1=Negative value for SMAX W32(W52)
0=Positive value for SMAX
W30(W50) B02 1=Set BIAS from PC Processor W08(W15)
0=PID Algorithm BIAS(FFV)
W30(W50) B01 1=Change sign of BIAS(FFV)
0=Maintain sign
W30 B00 1=Cascade Loop 1 into Loop 2 (in W30 only)
0=No cascade (Set W50 B00=0)
W30(W50) B17 1=Use scaling for PV W65
0=No scaling, nonĆscaled value returned
W30(W50) B16 1=Use scaling for SP W06(W13)
0=No scaling, nonĆscaled value returned
W30(W50) B15 1=Use scaling for ERROR W62
0=No scaling, nonĆscaled value returned
W30(W50) B14 1=Decouple Loop 1 to Loop 2 in W30, only
0=No decoupling (Set W50 B14=0)
W30(W50) B13 1=FFI from hardware Tieback input
0=FFI from PC Processor W10(W17)
W30(W50) B12 1=Change FFI to a negative value
0=Maintain FFI as a positive value
W30(W50) B11 1=Perform square root FFI
0=No square root
W30(W50) B10 1=Multiply FF term by K
F
0=No multiplication
11111
K
F
I X
K
F
2 X
K F I
K
F
I