Process Image; Overview - WAGO 750 Series Manual

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Process Image

4 Process Image
The I/O module (750-1491) provides one control/status byte (8 bits) and one data
word (16 bits) per input.
The I/O module records the input voltage ranges with a 16-bit process value
resolution.
The digitalized measured value is transmitted to the head station´s process
image in a data word (16 bits) as input byte "0" (low) and input byte "1" (high).
With the setting "Process Image: Standard," the head station hides the control/
status bytes of all inputs.
With the setting "Process Image: Extended," the control/status bytes are shown
in the fieldbus process image.
With the setting "1-channel mode" the number of resistor bridges can be reduced
from 2 to 1. In this setting, only 2 instead of 4 inputs are available.
The required settings can be made through parameterization with the
WAGO-I/O-CHECK commissioning tool. 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

Control/status byte with setting "Process Image: Standard":
Representation depends on the head station!
The I/O module provides the head station with a complete process image,
including control/status bytes. The WAGO-I/O-CHECK commissioning tool
accesses the complete commissioning process image. The head station uses a
different process image for provision of cyclic process data via the fieldbus.
Presentation of control/status bytes may be suppressed in this other process
image, depending on the head station used (see table "Process Image
('Standard')" or table "Process Image ('Standard') in 1-Channel Mode")
Manual
Version 1.0.0
750-1491 2AI Resistor Bridge (Strain Gauge)
WAGO I/O System 750