WAGO-I/O-SYSTEM 750 XTR
Process Image
31
750-468/040-000 4AI 0-10V DC S.E. /XTR
Manual
Version 1.3.0
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4
Process Image
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The I/O module provides 1 status byte (8 bits) and 1 data word (16 bits) per
channel.
The digitalized measured value is transmitted to the process image of the
fieldbus coupler/controller in a data word (16 bits) as an input byte 0 (low) and
input byte 1 (high). This value is mapped with a resolution of 12 bits on bit B3 ...
B14. Status information, which can be evaluated for fault detection, is contained
in the 3 least significant bits (B0 ... B2).
In the event of an overrange, bit B0 = 1 is set.
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Evaluation of Status Byte
Some fieldbus systems can process status information of process value by
means of a status byte.
This status byte can be displayed via the commissioning tool
WAGO-I/O-
CHECK
.
However, processing via the fieldbus coupler/controller is optional, which means
that accessing or parsing the status information depends on the fieldbus system.
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Mapping of process data in the process image of fieldbus systems
The representation of the I/O modules’ process data in the process image
depends on the fieldbus coupler/controller used. Please take this information as
well as the particular design of the respective control/status bytes from the
section “Fieldbus Specific Design of the Process Data” included in the description
concerning the process image of the fieldbus coupler/controller used.
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