67
Value at timeout
This setting is only displayed if "Measured variable" is set to "User".
If the timeout time is exceeded, you can define here whether the controller should issue the last value
transmitted ("Unchanged") or a definable substitute value.
Sensor correction
This setting is only displayed if "Measured variable" is set to "User".
The value of the CAN input can be corrected by applying a fixed value.
Sensor error
This setting is only displayed if
sensor check is active and
"Measured variable" is set to "
User
".
When "
Sensor check
" is active, the
sensor error
of a CAN input is available as an input variable for
functions: status "
No
" for a sensor that is working correctly and "
Yes
" for a defect (short circuit or
lead break). This allows the controller to react to the failure of a sensor, for example.
If the
Standard
thresholds are selected, a short circuit will be indicated if the value falls below the
measurement limit
and a lead break will be indicated if the value exceeds the
measurement limit.
The
Standard
values for temperature sensors are -9999.9 °C for a short circuit and 9999.9 °C for a
lead break. Those values are utilised in the internal calculations in the event of an error.
By selecting the thresholds and values for short circuit and lead break appropriately, a fixed value can
be specified for the controller in the event of sensor failure at the transmission node, in order to allow
a function to continue operating in emergency mode (fixed hysteresis: 1.0 °C).
The short circuit threshold must be defined below the lead break threshold.
In
System values
/ General, a sensor error for
all
inputs, CAN inputs and DL inputs is available.
Summary of Contents for CAN-EZ3
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