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Debugging an Application
172
SR2MAN01 11/2007
Smart Relay Reaction to a Power Failure
Description A power failure may cause the smart relay to restart and lose any data not saved.
Smart relays have the ability to save the current time for at least 10 years.
In addition, it is also possible to back up the variables configured with the Latching
option defined in the parameters window.
Latching The Latching function is used to save the state of the counter’s current values in the
event of a power failure.
The blocks that have this function are the following:
z In LD mode:
z Auxiliary relays,
z Discrete outputs,
z Timers
z Counters
z Fast counter,
z In FBD mode:
z AC, BH, Li timer,
z Cam programmer function CAM BLOCK,
z PRESET COUNT, UP DOWN COUNT counter,
z PRESET H-METER hour counter,
z Data archiving function ARCHIVE,
z Fast counters.