Manual
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3.4.5 Diagnostic input DESINA
Pin 2 of the M12 slot can be configured as a diagnostic input on all digital modules. If a 0 volt signal is
present at a diagnosis input, it will be displayed inverted in the process map. At the same time, a
channel-specific diagnostic message will be issued via the channel-related diagnostic.
3.4.5.1 Examples for the application of the DESINA diagnostic function
Pin 2
Pin 2 basically behaves like an inverting input when it is parameterized as a diagnostic input.
A special feature is that the assigned LED lights up red when a voltage of 0 V
logical "1" is present.
It is therefore possible to indicate faults of external devices at . Several suggestions are given
in the following.
3.4.5.2 Connection of Sensors/Actuators with Diagnostic Output
Imagine you are using a sensor or an actuator with diagnostic output. You can also evaluate this diag-
nosis signal, and process and represent it in the controller or visualization unit using a conventional
I/O system.
However, you have no visual fault display in the proximity of the defects sensor, which is probably also
fitted in a concealed location. Visual indication at the M12 slot of the also facilitates accurate
on-site fault localization.
1 (+)
2 Diagnosis
3 (-)
4 (S)
M12
female connector
DESINA Sensor
Fig. 11: Connection of Sensors/Actuators with Diagnostic Output
Recognizing:
Front surface damage
defective electronics
wire-break
