Behavior Of The Fieldbus Coupler During Interruption Of Operations; Loss Of Power; Loss Of Fieldbus; Local Bus Error - WAGO I/O-SYSTEM 750 Manual

WAGO-I/O-SYSTEM 750
750-354/000-001 EtherCAT® Fieldbus Coupler, ID Switch
9.3 Behavior of the Fieldbus Coupler during
Interruption of Operations
An interruption of operation occurs when the fieldbus coupler can no longer
exchange process data with the master and/or the I/O modules.
9.3.1

Loss of Power

In the case loss of power outage or falling below the minimum level of the power
supply to the fieldbus coupler, the communication with the master and the I/O
modules will be interrupted. The I/O modules connected to the fieldbus coupler
will switch their output data to a value of "0".
9.3.2

Loss of Fieldbus

The fieldbus coupler determines that a loss of the fieldbus has occurred when the
communication to the master is interrupted. A loss of fieldbus can be caused by
losing the master itself or by an interruption in the communication connection.
A loss of fieldbus additionally means that the fieldbus coupler cannot receive any
output process data from the master nor can it send any input process data to
the master.
During a loss of fieldbus, the fieldbus coupler switches the output signal of the I/O
modules to a value of "0".
9.3.3

Local Bus Error

The fieldbus coupler determines that a local bus error has occurred when the
communication with the I/O modules is disrupted or interrupted. A local bus error
can occur due to the removal e.g. of an I/O module from the fieldbus node.
In addition, a local bus error means that the fieldbus coupler cannot exchange
any more process data with the I/O modules.
The I/O modules switch their output signals to a value of "0" in the case of an
error.
The fieldbus coupler reports a local bus error by sending a blink code. To send
the blink code, the fieldbus coupler uses the I/O LED.
More information about the LED Signaling
Read the detailed description for the evaluation of the displayed LED-Signals in
the chapter "Diagnostics", "Evaluating Node Status - I/O LED (Blink Code
Table)".
Diagnostics 133
Manual
Version 1.2.1