DL bus
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Designation
Every DL input can be given its own designation. The designation can be selected from various desig
-
nation groups or can be user defined, as for the other controller inputs.
Example:
DL bus timeout
As long as the information continues to be read from the DL bus, the
network error
for the DL input
will be
"No".
If the controller scans the DL sensor value three times and no value is transmitted, the
network error
changes from
"No"
to
"Yes".
You can then define whether the controller should issue the last value
transmitted or a definable substitute value (only when the measured variable is set to
User
).
The
network error
can also be selected as the source of a function input variable, which allows the
controller to react appropriately to a failure of the DL bus or DL sensor.
In System values / General, a network error for
all
DL inputs is available.
Sensor check
If you set "Sensor check" to "Yes", the sensor error of the sensor supplying
the DL input is available as an input variable for a function.
Measured variable
If "Measured variable" is set to "Automatic", the unit of measurement
specified by the DL sensor will be applied in the controller
If you select "User", you can select a unit of your own, a sensor correction and, if sensor check is ac
-
tive, a monitoring function.
Every DL input is assigned a unit, which can differ from the unit used by the DL sensor. A wide range
of units is available to choose from.
This setting is only displayed if "Measured variable" is set to "User".
Value at timeout
This setting is only displayed if "Measured variable" is set to "User".
If a timeout is set, you can define here whether the controller should issue the last value transmitted
("Unchanged") or a definable substitute value.
