Process Image; Overview - WAGO 750 Manual

WAGO-I/O-SYSTEM 750
750-471 4AI U/I Diff Galv
4

Process Image

The I/O module 750-471 provides 1 status byte (8 bits) and 1 data word (16 bits)
per channel.
The I/O module detects the following input current and voltage ranges with a
sixteen-bit processing value resolution:
• 0 ... 10 V
• − 10 ... + 10 V
• − 200 ... + 200 mV
• 0 ... 20 mA
• 4 ... 20 mA
• 3.6 ... 21 mA
• + 20 ... − 20 mA
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). The I/O module can be parameterized so additional error and
status information, which can be used to to identify an error, can be transmitted in
the three lowest (B0 ... B2) of the sixteen bits (see tables below). If the
measurement is above or below the measurement range, bits B0 ... B1 are set =
1; B2 is not used. The measured value is then mapped with a resolution of
thirteen bits on bits B3 ... B15.
The WAGO-I/O-CHECK commissioning tool can be used to parameterize the
required operating mode. Alternatively, the I/O module can also be
parameterized via PROFIBUS and PROFINET device description (GSD file). The
parameterization description can be found in the appendix in Section
"Configuration and Parameterization via GSD File with PROFIBUS DP and
PROFINET IO."
4.1

Overview

Presentation of control/status bytes a function of fieldbus
coupler/controller!
The I/O makes its complete process image, including the control/status bytes, to
the fieldbus coupler/controller. The WAGO-I/O-CHECK startup tool access this
complete startup process image. The fieldbus coupler/controller uses a different
process image for provision of cyclic process data via the fieldbus. Presentation
of the control/status byte may be suppressed in this other process image,
depending on the fieldbus coupler/controller being used.
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Process Image 31
Manual
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