Siemens 500 NIM User Manual
Page 72
NIM Primitives
4-19
SIMATIC TIWAY I Series 500 NIM User Manual
Format: TT = 2D = Loop Status (one word)
MSB
A B C D E F G H I J K L M N O P
LSB
A - Loop Mode: If set to one, the loop is in auto mode. If set to zero,
the loop is in manual.
B - Loop Cascade: If set to one, the loop is in closed cascade. If set to
zero, the loop is in open cascade.
C - Error Deviation: If set to one, the loop is in positive error deviation.
If set to zero, the loop is in negative error deviation.
D - PV High High Alarm: If set to one, the process variable is in high
high alarm. If set to zero, the process variable is not in high high
alarm.
E - PV High Alarm: If set to one, the process variable is in high alarm.
If set to zero, the process variable is not in high alarm.
F - PV Low Alarm: If set to one, the process variable is in low alarm.
If set to zero, the process variable is not in low alarm.
G - PV Low Low Alarm: If set to one, the process variable is in low low
alarm. If set to zero, the process variable is not in low low alarm.
H
I
J
K
L
M to P - Spare: Set to zero.
-
-
-
-
-
Yellow Band: If set to one, the loop deviation is in the yellow band.
If set to zero, the loop deviation is not in the yellow band.
Orange Band: If set to one, the loop deviation is in the orange band.
If set to zero, the loop deviation is not in the orange band.
PV Rate of Change Alarm: If set to one, the loop PV is in rate of
change alarm. If set to zero, the loop PV rate of change is not in
alarm (for 560/565 controllers).
PV Broken Transmitter Alarm: If set to one, the loop PV has a
broken transmitter. If set to zero, the loop PV does not have a
broken transmitter (for 560/565 controllers).
Loop Overrun: If set to one, the loop is overrunning its time alloca-
tion. If set to zero, the loop is not overrunning its time allocation (for
560/565 controllers).
Figure 4-9
Loop Status Data Element Format