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Failsafe
P808 Fail-safe Mode
By default, if a fail-safe condition occurs, then the display and the output are
held at their last known values until a valid reading is obtained.
If required, then you can change this so that the unit goes to high (100% of
span), or low (empty) as follows:
Remain at the last known value
Will fail to the high value (100% of Span).
Will fail to the low value (empty)
See Also P218 (RL1), P228 (RL2) - Relay Fail-safe and P840 Output Fail-safe
Important Information
In the event of a fail-safe condition occurring, when the PC
Handheld Communicator or the optional Handheld Communicator,
are connected to the unit, or the optional on board display is fitted
the Display and Output can be configured to fail to a condition
which is independent of each other. To set independent Output
Failsafe see P840.
P809 Fail-safe Time
In the event of a fail-safe condition the failsafe timer determines the time
before fail-safe mode is activated. Default = 1min.
If the timer activates, the unit goes into fail-safe, as determined by P808
(Display), P218, 228 (Relays) and P840 (Output). When this happens, if the
PC Handheld Communicator or the optional Handheld Communicator, are
connected to the unit, or the optional on board display is fitted, you will see
the message “Failed Safe!” on the display, along with a message explaining
why (lost echo or transducer fault, for example)
When a valid measurement is obtained then the display and output will be
restored and the timer is reset.
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