Schweitzer Engineering Laboratories SEL-311C - Figure 7.2 Example Operation of Optoisolated Inputs IN1201 through IN208-Extra I;O Board (Model 0311 C01 X); Input Debounce Timers; Input Functions

7.4
SEL-311C Relay Instruction Manual Date Code 20060320
Inputs, Outputs, Timers, and Other Control Logic
Optoisolated Inputs
Figure 7.2 Example Operation of Optoisolated Inputs
IN1201 Through IN208—Extra I/O Board (Model 0311C01x)
Input
Debounce Timers
See Figure 7.1.
Each input has settable pickup/dropout timers (IN101D–IN106D) for input
energization/de-energization 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–IN106D are settable from 0.00 to 2.00 cycles. The
relay takes the entered time setting and internally runs the timer at the nearest
1/8-cycle. For example, if setting IN105D = 0.80, internally the timer runs at
the nearest 1/8-cycle: 6/8-cycles (6/8 = 0.75).
For most applications, the input pickup/dropout debounce timers should be
set in 1/4-cycle increments.
The relay processing interval is 1/4-cycle, so Relay Word bits IN101 through
IN106 are updated every 1/4-cycle. The optoisolated input status may assert
input debounce timer settings less than 1/4-cycle, because these timers run
each 1/8-cycle. However, Relay Word bits IN101 through IN106 may not be
available until the next 1/4-cycle relay processing interval.
If more than 2 cycles of debounce are needed, run Relay Word bit INn (n =
101 through 106) through a SEL
OGIC control equation variable timer and use
the output of the timer for input functions (see Figure 7.24 and Figure 7.25).
Input Functions
There are no optoisolated input settings such as:
IN101 =
IN102 =
Open
IN201 IN201 Logical 0De-energized
Opto-
isolated
Inputs
Example
Switch
States
Built-in
Debounce
Timers
Relay
Word
Bits
Relay
Word Bit
States
Optoisolated
Input States
(+)
(—)
IN201D
IN201D
Closed
IN202 IN202 Logical 1
Energized
IN202D
IN202D
Closed
IN203 IN203 Logical 1
Energized
IN203D
IN203D
Open
IN204 IN204 Logical 0
De-energized
IN204D
IN204D
Open
IN205 IN205 Logical 0
De-energized
IN205D
IN205D
Open
IN206 IN206 Logical 0De-energized
IN206D
IN206D
Closed
IN207 IN207 Logical 1
Energized
IN207D
IN207D
Open
IN208 IN208 Logical 0
De-energized
IN208D
IN208D