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WAGO-I/O-System 750
Diagnostics 125
750-370 PROFINET IO Fieldbus Coupler
Manual
Version 2.0.0
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10.2 Error response
10.2.1 Fieldbus Failure
A fieldbus failure is indicated, for example, if the master is switched off or if the
bus cable is interrupted. An error at the master can also result in a fieldbus failure.
A fieldbus failure is indicated by the red “BF” LED.
When the fieldbus fails, the fieldbus coupler can release the configurable
substitute values of the I/O modules. A substitute value can be determined for
each channel when configuring the inputs and outputs.
Table 63: Diagnosis of Fieldbus Failure
Substitute value strategy
value (bit-oriented)
Digital Output Modules
value (byte-oriented)
Analog Output Modules
Minimum value
0
0 mA or 4 mA, 0 V
Maximum value
1
20 mA, 10 V
Substitute value
0 or 1
0/4 mA … 20 mA,
-10 V … +10 V
Stop the internal bus
Response determine by the I/O module.
The fieldbus coupler enters the values in the output process image. With I/O
modules that have a byte- or word-oriented data width (e. g., pulse width module),
the substitute value is determined using the value range.
As soon as the fieldbus is reactivated, the process data is transmitted again and the
outputs of the node are set accordingly.
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