Siemens 500 NIM Manual Do Utilizador
NIM Primitives
4-16
SIMATIC TIWAY I Series 500 NIM User Manual
Data Element Types and Formats (continued)
Table 4-4
Basic Data Unit Format (continued)
TT
Data Element Type
Length
(in bytes)
** 43 or 83
Analog Alarm Sample Rate
4
** 44 or 84
Analog Alarm Setpoint
4
45
Analog Alarm Variable Flag*
2
46
Analog Alarm Control Flag
4
** 47 or 87
Analog Alarm Error*
4
** 48 or 88
Analog Alarm P.V. High High Alarm
4
** 49 or 89
Analog Alarm P.V. Low Low Alarm
4
** 4A or 8A
Analog Alarm Rate of Change Alarm
4
* These TT types are read-only data elements.
# This TT type is a write-only data element.
** Format
# This TT type is a write-only data element.
** Format
2x, 3x, and 4x = IBM format
6x, 7x, and 8x = IEEE format
6x, 7x, and 8x = IEEE format
NOTE: See Appendix B for a definition of TT 2x, 3x, 4x, 6x, 7x, and 8x
floating point representation.
floating point representation.
##=AD7D4= 869
6?A741C2
-)-
>!-
:%
6%
:
:
:
:
:
:
:
>
Figure 4-4
Discrete Data Element Format