28 •
INTERBUS
Fieldbus Dependent I/O Module
INTERBUS
The diagnostic status bit is set to '0' when the status of an output does not co-
incide with the status read back internally.
Valid reasons for the activation of a diagnostic message:
•
Missing voltage supply to the output drivers
•
Short circuit of an output conductor
•
Overload at the output
•
Internal fault of an output driver
A diagnostic status bit is set to '0' if a transmitted value of '1' by the master
controller does not produce a threshold voltage at a corresponding output.
When such a fault is detected, the electronic module transmits a periphery
fault signal to the fieldbus controller board, and illuminates the
“OVERLOAD” LED. The I/O module switches the LED off again once the
fault has been corrected, and after a 1 second delay, cancels the periphery fault
message.
7.4 Fieldbus Controller Boards
Master control systems such as PLC’s communicate to fieldbus devices on a
network via fieldbus controller boWAGO offers the WAGO-I/O-SYSTEM
758 PC Interface PCB fieldbus controller board for INTERBUS.
Fieldbus controller boards for programmable logical controls are available
from other manufacturers.
7.5 Configuration Software
Before a PLC can communicate I/O data with a fieldbus device, the fieldbus
controller board has to be configured for each field bus device on the network.
To accomplish this, the WAGO-I/O-SYSTEM 758 fieldbus controller board is
delivered with WAGO
NETCON
software for configuring and diagnosing
fieldbus networks.
Further configuration software, e.g. CMD (Configuration Monitoring Diag-
nostic), is available from other manufacturers.
