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WAGO-I/O-SYSTEM 750
Process Image
27
750-555 4AO 4-20mA
Manual
Version 1.2.1
4
Process Image
Mapping of process data in the process image of fieldbus systems
The representation of the process data of some I/O modules or their variants in
the process image depends on the fieldbus coupler/controller used. Please take
this information from the section “I/O Modules” included in the description
concerning the process image of the corresponding coupler/controller.
The analog output module 750-555 transmits 16-bit measured values and
8 optional status bits per channel.
The digitalized output value is transmitted in a data word (16 bits) as output
byte 0 (low) and output byte 1 (high) via the process image of the fieldbus
coupler/controller.
This output value is represented with a 12 bit resolution on bit B3 ... B14.
The 3 least significant bits (B0 ... B2) are not parsed.
For the standard module 750-555, the numerical values ranging from
0x0000 … 0x7FFF are scaled on the output current ranging from 4 mA … 20 mA.
Table 15: Process Image
Output current
4 mA ... 20 mA
Numerical value
Status-
byte
hex.
Error
LED
Binary
output value
Hex.
Dec.
4
’0000.0000.0000.0000’
0x0000
0
0x00
Off
8
’0001.1111.1111.1111’
0x1FFF
8191
0x00
Off
12
’0011.1111.1111.1111’
0x3FFF 16383
0x00
Off
16
’0101.1111.1111.1111’
0x5FFF 24575
0x00
Off
20
’0111.1111.1111.1111’
0x7FFF 32767
0x00
Off
Broken wire
or
inadmissible
load
combination
XXXX.XXXX.XXXX.XXX’ 0xXXXX
X
0x40
On