Rockwell Automation 1771-PD PID MODULE (+DU) - Manual (Page 105)

Programming
Chapter 3
3Ć62
Figure 3.20
Status Monitor Byte Preconditioning
SB
/ /
B07 B06 B05
SB B04 Alarm
SB B03
Power-up
SB B02 Loss of Input
SB B01 Loss of
SB B00 Soft Fault Mode
+ 15V DC
SB = Storage Bit
The condition of bits B07, B06, B05 must be examined to determine if the other
five bits are valid. B07 and B06 must be 0. B05 must be 1.
The rungs below show one technique for preconditioning:
11125
Table 3.K
Loop Block Alarm Conditions
Condition Alarm Bit
E<EMN
E>EMP
V
I
>V
I
MAX
In Manual Mode
VP>4095
V
D
>V
D
MAX
V<VMIN
V>VMAX
Dynamic block error
Loop block error
W61(W58)B15
W61(W68)B14
W62(W58)B10
W61(W68)B05
W61(W68)B03
W61(W68)B02
W61(W68)B01
W61(W68)B00
W58 B15
W58 B14