Data Element Types And Formats - Siemens SIMATIC TIWAY 1 User Manual

4.6

Data Element Types and Formats

4-14 NIM Primitives
The data element types (TTs) and their length (in bytes) are defined in
Table 4-4. Figure 4-4 through Figure 4-15 show the format of the data
elements.
Table 4-4 Data Element Types and Formats
TT
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
10
11
12
17
** 20 or 60
** 21 or 61
** 22 or 62
** 23 or 63
** 24 or 64
** 25 or 65
* 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
Instruction Memory (L)
Variable Memory (V)
Constant Memory (K)
Discrete Input (X)
Discrete Output (Y)
Control Register (CR)
Discrete Input Packed (X)
Discrete Output Packed (Y)
Control Register Packed (CR)
Word Input (WX)
Word Output (WY)
XY Force
CR Force
Word Force
Timer-Counter Preset (TCP)
Timer-Counter Current (TCC)
Drum Step Preset (DSP)
Drum Step Current (DSC)
Drum Count Preset (DCP)
Secondary System Status*
Loop Gain
Loop Reset
Loop Rate
Loop High Alarm
Loop Low Alarm
Loop Process Variable
SIMATIC TIWAY I Series 500 NIM User Manual
Length
(in bytes)
2
2
2
1
1
1
1
1
1
2
2
1
1
3
2
2
1
1
2
4
4
4
4
4
4
4