Programming with TAPPS2 / M-Bus
40
Unit
If the measured variable is set to "
Automatic
", the unit of measurement specified by the M-Bus device
will be applied in the bus converter.
If you select "
User def.
", you can select a
unit
of your own, a
sensor correction
and, if the
sensor
check
is set to active, a monitoring function.
Every M-Bus input is assigned a
unit
, which can differ from the unit used by the M-Bus device. A wide
range of units is available to choose from.
Sensor correction
The value of the M-Bus input can be corrected by applying a fixed differential value.
Value at timeout
This setting is only displayed if the measured variable is set to "
User def.
". This application is
not
yet
available.
Sensor check
If you set the sensor check to "
Yes
", the
sensor error
of the M-Bus value is available as a digital input
variable for a function.
This application is only useful if user defined threshold and output values are specified for the sensor
error.
Sensor error
This setting is only displayed if the measured variable is set to "
User def.
" and the
sensor check is
active
.
Sensor error
: Status "
No
" for a correct value
within
the threshold values and "
Yes
" for a value
outside
the thresholds. This allows the controller to react to the failure of an M-Bus device, for example.
In order to make good use of the sensor check, the short circuit and lead break thresholds should be
changed from "Standard" to "
User defined
" and the required threshold values defined. The required
short circuit and lead break values will subsequently also be defined by the user.
If the measurement read is
below
the defined
short circuit threshold
or
exceeds
the
lead break
threshold
, the relevant
output values
will be applied instead of the measurement.
