Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 85)

Programming
Chapter 3
3Ć42
Figure 3.12
Loop Status Word, Loop 1 W61 and Loop 2 W68
Loop 1
1
0
17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00
1
0
W61
Loop 2
W68
NEG.
ERROR1
POS.
NEG.
ERROR2
POS.
NEG.
SCALED PV
POS.
NEG.
POS.
E
E
E>EMP1
E>EMP2
NEG.
FFV1
POS.
NEG.
FFV2
POS.
LOAD/
ENTER
COMPLETE
0
V > V
MAX
I I
V > V
MAX
I I
LOSS OF
ANALOG
INPUT 1
LOSS OF
ANALOG
INPUT 2
LOSS OF
TIEBACK
INPUT 1
LOSS OF
TIEBACK
INPUT 2
MANUAL
MODE
MANUAL
MODE
POWER-UP
COMPLETE
0
V >4095
P
V >4095
P
V > V
MAX
D D
V > V
MAX
D D
V
V
V>VMAX
V>VMAX
W61(W68) B07 1=Loss of analog input
W61(W68) B06 1=Loss of tieback input
W61(W68) B05 1=Auto/manual station in the manual
mode
0=Loop is in the automatic mode under
PID module control
W61(W68) B04 1=PowerĆup sequence is complete, in
W61 only
0=In powerĆup mode; module is
unprogrammed
W61(W68) B03 1=Proportional term > 4095
W61(W68) B02 1=Derivative term > V
D
MAX W27(W47)
W61(W68) B01 1=Algorithm output < VMIN W28(W48)
W61(W68) B00 1=Algorithm output > VMAX W29(W49)
W61(W68) B17 1=ERROR W62(W68) has negative value
0=ERROR has positive value
W61(W68) B16 1=Scaled PV W65(W72) has negative value
0= positive value
W61(W68) B15 1=Error < EMN W21(W41)
W61(W68) B14 1=Error > EMP W22(W42)
W61(W68) B13 1=FFV has a negative value
0=FFV has a positive value
W61 B12 1=Load/enter sequence is complete, in W61
only.
W61(W68) B11 1=Error is within the dead band (W23)
0=Error is outside the dead band
W61(W68) B10 1=Integral term > V
I
MAX W26(W46)
11115
SCALED PV
WITHIN
EROR
DEAD BAND
OUTSIDE
IN PROCESS
AUTOMATIC
AUTOMATIC
WITHIN
EROR
DEAD BAND
OUTSIDE