Справочник Пользователя для Siemens 500 NIM

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.

0

Instruction Memory (L)

2

1

Variable Memory (V)

2

2

Constant Memory (K)

2

3

Discrete Input (X)

1

4

Discrete Output (Y)

1

5

Control Register (CR)

1

6

Discrete Input Packed (X)

1

7

Discrete Output Packed (Y)

1

8

Control Register Packed (CR)

1

9

Word Input (WX)

2

A

Word Output (WY)

2

B

XY Force

1

C

CR Force

1

D

Word Force

3

E

Timer-Counter Preset (TCP)

2

F

Timer-Counter Current (TCC)

2

10

Drum Step Preset (DSP)

1

11

Drum Step Current (DSC)

1

12

Drum Count Preset (DCP)

2

17

Secondary System Status*

4

** 20 or 60

Loop Gain

4

** 21 or 61

Loop Reset

4

** 22 or 62

Loop Rate

4

** 23 or 63

Loop High Alarm

4

** 24 or 64

Loop Low Alarm

4

** 25 or 65

Loop Process Variable

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