Fieldbus Failure - WAGO -I/O-SYSTEM 750 Technical Description, Installation And Configuration

106 • PROFINET IO 750-340
Error Response
3.1.10 Error Response
3.1.10.1

Fieldbus Failure

A fieldbus failure is indicated if the I/O controller switches off or if the
Ethernet cable is interrupted. An error in the I/O controller can also lead to a
fieldbus failure
The red BF LED lights up.
When the fieldbus fails, the coupler can release the configurable substitute
values of the I/O modules. A substitute value can be determined for each
channel when configuring the outputs.
Substitute value
strategy
Minimum value
Maximum value
Substitute value
Stop internal bus
The values are entered into the output process image by the coupler. With I/O
modules that have a byte orientated 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.
3.1.10.2 Internal Bus Failure
An internal bus failure occurs, for example, if an I/O module is removed. If
this error occurs during operation, the output modules react like during an
internal bus stop. The input process image is set according to the configuration
strategy.
The "I/O" LED flashes red. The buscoupler (I/O device) generates a detailed
diagnostic message.
When the I/O module fault is repaired, the buscoupler restarts according to the
configured restart behavior. The process data is transmitted again and the
outputs of the node are set accordingly.
Value (bit orientated)
Digital Output Modules
0
1
0 or 1
Response determined by the I/O module
Value (byte orientated)
Analog Output Modules
0 or. 4 mA, -10 or. 0 V
20 mA, 10 V
0/4 ... 20 mA, -10/0 ... +10 V
WAGO-I/O-SYSTEM 750
PROFINET IO