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