Seal-In memory in PLCs uses what to maintain a latched output state?

Seal-In memory in PLCs uses what to maintain a latched output state?

• A. To Address The Memory Bit For The Latching Output
• B. To Address A Motor Driver
• C. Addressing Input Sensors
• D. Addressing A Timer

Answer: (A)

Seal-in memory works by using a memory bit dedicated to storing the output’s latched state. When the input energizes, that memory bit is set; the output coil is driven by that bit, and a parallel contact of the same memory bit keeps it energized, which holds the output on even after the input drops. The key is addressing the specific memory bit that represents the latched output. This is why using the memory bit for the latching output is the correct mechanism. Options referring to motor drivers, input sensors, or timers don’t provide the sustained remembered state needed for a seal-in latch.

Seal-in memory works by using a memory bit dedicated to storing the output’s latched state. When the input energizes, that memory bit is set; the output coil is driven by that bit, and a parallel contact of the same memory bit keeps it energized, which holds the output on even after the input drops. The key is addressing the specific memory bit that represents the latched output. This is why using the memory bit for the latching output is the correct mechanism. Options referring to motor drivers, input sensors, or timers don’t provide the sustained remembered state needed for a seal-in latch.