Siemens 500 NIM User Manual
Page 73
NIM Primitives
4-20
SIMATIC TIWAY I Series 500 NIM User Manual
Data Element Types and Formats (continued)
TT = 2E = Loop Control Flags (two words)
MSB
ABCDEFGH IJKLMNOP QRSTUVWX YZabcdef
LSB
A
B
C
D
E
F
G
H
I
J
K
L
M
N
P
R
S
T
U
V
Y - f
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
PV scale 20% offset
Take square root of PV
Monitor HIGH/LOW alarm
Monitor HIGH/HIGH/LOW-LOW alarm
Monitor deviation alarms
Monitor rate-of-change alarm
Monitor broken transmitter alarm
Use PID position algorithm
Use PID velocity algorithm
Direct acting
Reverse acting
Error squared control
Error deadband control
Lock auto/manual mode
Lock cascade mode
Lock setpoint
Execute Special Function program on the P.V.
Execute Special Function program on the setpoint
Freeze error sum on output out-of-range
Ramp/soak on the setpoint
Output is bipolar
Number of the SF program that will be executed
O
If the bit is set to 1, the option is enabled. If the bit is set to 0, the
option is disabled.
W - Process variable is bipolar
X - Enable derivative gain limiting
Figure 4-10
Loop Control Flag Data Element Format