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
2x, 3x, and 4x = IBM 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.
##=AD7D4= 869
6?A741C2
-)-
>!-
:%
6%
:::::::>
Figure 4-4 Discrete Data Element Format