In a signaling line circuit with 24 devices, the integrity monitoring indicates a single ______ condition within 200 seconds.

In a signaling line circuit with 24 devices, the integrity monitoring indicates a single ______ condition within 200 seconds.

• A. Short
• B. Open
• C. Close
• D. Supervisory

Answer: (B)

Signaling line circuits are continuously monitored for faults that interrupt communication along the loop. When a break occurs in the loop—like a wiring fault or a device disconnect—the circuit goes open. The integrity monitoring is designed to detect that single open condition on the loop within a set time, here about 200 seconds. That’s why the correct result is an Open condition. A short would show up as a short fault (low impedance path) rather than an open, and a supervisory condition refers to monitoring a device’s state rather than the integrity of the signaling line itself.

Signaling line circuits are continuously monitored for faults that interrupt communication along the loop. When a break occurs in the loop—like a wiring fault or a device disconnect—the circuit goes open. The integrity monitoring is designed to detect that single open condition on the loop within a set time, here about 200 seconds. That’s why the correct result is an Open condition. A short would show up as a short fault (low impedance path) rather than an open, and a supervisory condition refers to monitoring a device’s state rather than the integrity of the signaling line itself.