Schweitzer Engineering Laboratories SEL-311L, Instruction Manual, Page: 268 / 734

7-16 Inputs, Outputs, Timers, and Other Control Logic Date Code 20010625
SEL-311L Instruction Manual
Figure 7.14: Latch Control Switch Operation Time Line
Use a Remote Bit Instead to Enable/Disable the Reclosing Relay
Use a remote bit to enable/disable the reclosing relay, instead of an optoisolated input. For
example, substitute remote bit RB1 for optoisolated input IN104 in the settings accompanying
Figure 7.13:
SET1 = /RB1 * !LT1 [= (rising edge of remote bit RB1) AND NOT(LT1)]
RST1 = /RB1 * LT1 [= (rising edge of remote bit RB1) AND LT1]
79DTL = !LT1 [= NOT(LT1); drive-to-lockout setting]
Pulse remote bit RB1 to enable reclosing, pulse remote bit RB1 to disable reclosing, etc.—much
like the operation of optoisolated input IN104 in the previous example. Remote bits (Relay
Word bits RB1 through RB16) are operated through the serial port. See Figure 7.9 and
Section 10: Line Current Differential Communications and Serial Port Communications and
Commands
for more information on remote bits.
These are just a few control logic examples—many variations are possible.