106 Diagnostics
WAGO I/O SYSTEM 750 XTR
750-333/040-000 FC PROFIBUS G2 12MBd XTR
Manual
Version 1.4.0
9.1.4
Evaluating Power Supply Status
The power supply unit of the device has two green LEDs that indicate the status
of the power supplies.
LED 'A' indicates the 24 V supply of the coupler.
LED 'C' reports the power available on the power jumper contacts for field side
power.
Table 55: Power supply status diagnostics
– solution in event of error
LED Status
Meaning
Solution
A
Green
Operating voltage for the system is
available.
-
Off
No power is available for the system
Check the power supply for the system
(24 V and 0 V).
C
Green
The operating voltage for power jumper
contacts is available.
-
Off
No operating voltage is available for the
power jumper contacts.
Check the power supply for the power
jumper contacts (24 V and 0 V).
9.2
Error response
9.2.1
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 56: Diagnosis of Fieldbus Failure
Substitute value strategy
value (bit-oriented)
Digital Output Modules
value (byte-oriented)
Analog Output Modules
Minimum value
0
0 or 4 mA, 0 V
Maximum value
1
20 mA, 10 V
Substitute value
0 or 1
0/4 ... 20 mA, -10 ... +10 V
Stop the local 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.