Siemens 500 NIM User Manual
Page 75
NIM Primitives
4-22
SIMATIC TIWAY I Series 500 NIM User Manual
Data Element Types and Formats (continued)
TT = 36 = Ramp/Soak Step (13 bytes, IEEE format; TT 76 is IBM format)
000K
TT
SSSSSSSS
RRRRRRRR
K -
Step type (0 = ramp step, 1 = soak step)
TT -
Event status bit data element type (04 = Y, discrete output
EEEE - Event status bit address
SSSS SSSS
- Ramp step: contains the ramp destination setpoint
Soak step: contains the soak time
RRRR RRRR- Ramp step: contains the ramp rateĆofĆchange
Soak step: contains the soak deadband
05 = CR, control relay)
EEEE
Figure 4-13
Ramp/Soak Step Data Element Format
TT = 45 = Analog Alarm Variable Flag (1 word)*
MSB
ABCDEFGH IJKLMNOP
LSB
A - Enable alarm**
B - Disable alarm**
C - Analog variable in high high alarm
D- Analog variable in high alarm
E - Analog variable in low alarm
F - Analog variable in low low alarm
G - Analog variable in yellow deviation alarm
H - Analog variable in orange deviation alarm
I - Analog variable in rateĆofĆchange alarm
J - Analog variable in broken transmitter alarm
K - Analog alarm is overrunning
L - P - Unused and set to zero
* Read only data type
** These bits can accept write updates
If the bit is set to one, the action is enabled.
If the bit is set to zero, the action is disabled.
Figure 4-14
Analog Alarm Variable Flag Data Element Format