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SIMATIC TIWAY I Series 500 NIM User Manual
Table 4-4 Basic Data Unit Format (continued)
TT
** 26 or 66
** 27 or 77
** 28 or 78
** 29 or 79
** 2A or 6A
** 2B or 6B
** 2C or 6C
2D
2E
2F
**30 or 70
**31 or 71
** 32 or 72
Loop Process Variable High High Alarm
** 33 or 73
Loop Process Variable Low Low Alarm
** 34 or 74
# 35
** 36 or 76
** 37 or 77
**38 or 78
** 39 or 79
**3A or 7A
3B
**3C or 7C
** 3D or 7D
** 3E or 7E
** 3F or 7F
** 40 or 80
** 41 or 81
Analog Alarm Orange Deviation Alarm
** 42 or 82
Analog Alarm Yellow Deviation Alarm
* 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
Data Element Type
Loop Process Variable High Limit
Loop Process Variable Low Limit
Loop Orange Deviation Alarm
Loop Yellow Deviation Alarm
Loop Sample Rate
Loop Remote Setpoint
Loop Output
Loop Status*
Loop Control Flags
Ramp/Soak Status*
Loop Error*
Loop Bias
Loop Rate of Change Alarm
Loop Mode
Ramp/Soak Step
Ramp Destination Setpoint
Ramp Rate
Soak Time
Soak Deadband
Ramp/Soak Event Status Bit
Analog Alarm P.V. High Alarm
Analog Alarm P.V. Low Alarm
Analog Alarm Process Variable
Analog Alarm P.V. High Limit
Analog Alarm P.V. Low Limit
Length
(in bytes)
4
4
4
4
4
4
4
2
4
2
4
4
4
4
4
2
13
4
4
4
4
3
4
4
4
4
4
4
4
NIM Primitives
4-15
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