Schweitzer Engineering Laboratories SEL-311L, Instruction Manual, Page: 264 / 734

7-12 Inputs, Outputs, Timers, and Other Control Logic Date Code 20010625
SEL-311L Instruction Manual
Figure 7.10: Traditional Latching Relay
The sixteen (16) latch control switches in the SEL-311L Relay provide latching relay type
functions.
Figure 7.11: Latch Control Switches Drive Latch Bits LT1 Through LT16
The output of the latch control switch in Figure 7.11 is a Relay Word bit LT n ( n = 1 through 16),
called a latch bit. The latch control switch logic in Figure 7.11 repeats for each latch bit LT1
through LT16. Use these latch bits in SEL
OGIC
control equations.
These latch control switches each have the following SEL
OGIC
control equation settings:
SET n (set latch bit LT n to logical 1)
RST n (reset latch bit LT n to logical 0)
If setting SET n asserts to logical 1, latch bit LT n asserts to logical 1. If setting RST n asserts to
logical 1, latch bit LT n deasserts to logical 0. If both settings SET n and RST n assert to logical 1,
setting RST n has priority and latch bit LT n deasserts to logical 0.