7-2
Inputs, Outputs, Timers, and Other Control Logic
Date Code 20010625
SEL-311L Instruction Manual
Figure 7.1: Example Operation of Optoisolated Inputs IN101 Through IN106
Input Debounce Timers
Each input has settable pickup/dropout timers (IN101D through IN106D) for input
energization/deenergization debounce. Note that a given time setting (e.g., IN101D = 0.50) is
applied to both the pickup and dropout time for the corresponding input.
Time settings IN101D through IN106D are settable from 0.00 to 1.00 cycles. The relay takes the
entered time setting and internally runs the timer at the nearest 1/16-cycle. For example, if
setting IN105D = 0.80, internally the timer runs at the nearest 1/16-cycle: 13/16-cycles
(13/16 = 0.8125).
For most applications, the input pickup/dropout debounce timers should be set in 1/4-cycle
increments.
The relay updates Relay Word bits IN101 through IN106 every 1/4-cycle.
If more than 1 cycle of debounce is needed, use a SEL
OGIC
control equation variable timer (see
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