Sel SEL-351S - Optoisolated Inputs

7.2
SEL-351S Relay Instruction Manual Date Code 20080103
Inputs, Outputs, Timers, and Other Control Logic
Optoisolated Inputs
Optoisolated Inputs
Figure 7.1 and Figure 7.2 show the resultant Relay Word bits (e.g., Relay
Word bits IN101–IN106 in Figure 7.1) that follow corresponding optoisolated
inputs (e.g., optoisolated inputs IN101–IN106 in Figure 7.1) for the different
SEL-351S Relay models. The figures show examples of energized and de-
energized optoisolated inputs and corresponding Relay Word bit states. To
assert an input, apply rated control voltage to the appropriate terminal pair
(see Figure 1.2–Figure 1.4 and Figure 2.2–Figure 2.6).
Figure 7.1 is used for following discussion/examples. The optoisolated inputs
in Figure 7.2 operate similarly.
Figure 7.1 Example Operation of Optoisolated Inputs IN101–IN106
Open
IN101 IN101 Logical 0De-energized
Opto-
isolated
Inputs
Example
Switch
States
Built-in
Debounce
Timers
Relay
Word
Bits
Relay
Word Bit
States
Optoisolated
Input States
(+)
(—)
IN101D
IN101D
Closed
IN102 IN102 Logical 1
Energized
IN102D
IN102D
Closed
IN103 IN103 Logical 1
Energized
IN103D
IN103D
Open
IN104 IN104 Logical 0
De-energized
IN104D
IN104D
Open
IN105 IN105 Logical 0
De-energized
IN105D
IN105D
Open
IN106 IN106 Logical 0De-energized
IN106D
IN106D