WAGO-I/O-SYSTEM 750
I/O Modules 173
750-806 Fieldbus Controller DeviceNet
TM
Manual
Version 2.0.0
12.2.5
Specialty Modules
In addition to the data bytes, the control/status byte is also displayed for select I/O
modules. This byte is used for the bi-directional data exchange of the I/O module
with the higher-level control system.
The control byte (Control “C”) is transmitted from the controller to the I/O
module. The status byte (Status “S”) is transmitted from the I/O module to the
controller. As a result, it is possible to set the counter with the control byte or
indicate a range overflow/underflow with the status byte.
Additional Information
The special configuration of the respective control/status byte can be found in the
corresponding description of the I/O module. A manual with the detailed
description of each I/O module can be found on the Internet at:
The specialty modules represent analog I/O modules. Therefore, their process
input values also occupy one instance per channel in the “Analog Input Point
Object” (Class 0x67) and their process output values one instance per channel in
the “Analog Output Point Object” (Class 0x68).
Up/down counters
750-404, (and all versions except /000-005),
753-404, (and versions /000-003)
In the input and output process image, counter modules occupy 5 bytes of user
data: 4 data bytes and 1 additional control/status byte. The I/O module provides
32-bit counter values. 6 bytes are occupied in the process image.
Table 126: Input Process Image Counter Modules
Input Process Image
Instance
Byte designation
Remark
n
S
Status byte
-
not used
D0
Counter value
D1
D2
D3
These specialty modules represent 1 x 6 bytes and occupy 1 instance in class
(0x67).
