188 • I/O modules
Analog Inputs 750-465, -466, (-486)
Modular I/O System
ETHERNET TCP/IP
Numerical format
The digitized measured value is stored in a data word (16 bit) as an input byte
0 (high) and as an input byte 1 (low). The value with a 12 bit resolution is il-
lustrated on bit B3 ... B14. The three low value bits (B0 ... B2) are only used in
the event of an error.
Some fieldbus systems process status information to the input channel using a
status byte.
750-465, 750-466
Input current
Value
Status
LED
0-20
mA
4-20
mA
Binary
Hex.
Dec.
Error
E (1,2)
>20.5
>20.5
0111 1111 1111 1111
0x7FFF
32767
0x42
on
20
20
0111 1111 1111 1XXX
0x7FFF
32767
0x00
off
10
12
0100 0000 0000 0XXX
0x4000
16384
0x00
off
5
8
0010 0000 0000 0XXX
0x2000
8192
0x00
off
2.5
6
0001 0000 0000 0XXX
0x1000
4096
0x00
off
0.156
4.125
0000 0001 0000 0XXX
0x0100
256
0x00
off
0.01
4.0078
0000 0000 0001 0XXX
0x0010
16
0x00
off
0.005
4.0039
0000 0000 0000 1XXX
0x0008
8
0x00
off
0
4
0000 0000 0000 0XXX
0x0000
0
0x00
off
-
3.5 - 4
0000 0000 0000 0000
0x0000
0
0x00
off
-
0 - 3.5
0000 0000 0000 0000
0x0000
0
0x41
on
Numerical format for Siemens function blocks
For fieldbus masters with the ability to evaluate the status information within
the data word, i.e. Siemens format.
The status information is contained in Bit B0 .. B2.
The digitized input is placed at the position Bit B3 .. B15.
Содержание I/O-SYSTEM 750
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