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Programming IDEC SmartRelay
Caution
!
At a power failure, the logical input level may drop to zero before
IDEC SmartRelay can save the functions to the retentive memory.
In this case, the IDEC SmartRelay saves the function values
determined by the zero state at its inputs of the inputs.
Example: On-delay
With an input (I1) connected to a Trg connector of an On-delay FB
as shown in Fig.1, if I1 is ON and the IDEC SmartRelay power is
turned off and on, the timer current value of the On-delay FB is
sometimes reset as shown in Fig.2.
Other FBs are shown below.
•
Function blocks whose timer current value is sometimes reset.
Off-delay, On-delay, On-/Off-delay, Retentive on-delay,
Interval time-delay relay/Pulse output, Edge-triggered interval
time-delay relay, Operating hours counter, Asynchronous
pulse generator, Stairwell Light Switch, Dual-function switch
•
Function blocks whose output is sometimes set or reset when
input (I*) is connected to a S(R) connector with NOT.
Latching relay, Current impulse relay
104
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Fig. 1
Fig. 2
IDEC SmartRelay Manual
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