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loop is considered to be in Armed status. The alarm loop can switch from the Fire Prealarm status to

the Fire Alarm status if a second detector included into this alarm loop has actuated, as well as the giv-

en Alarm Delay has expired. (If Alarm Delay is set with zero value, Fire Prealarm status will switch to

Fire Alarm status immediately.) The Alarm Delay value of 255 s (the maximum possible value) corre-

sponds to unlimited timeout, such as switching from the Fire Prealarm status to the Fire Alarm status is

implemented only after actuating of another detector included into the alarm loop.

The integration time for an alarm loop of the Type 1 is defined in accordance with the requirements

mentioned in the Alarm Integration Time section of this Manual on the page 29.

Table 2 shows the matching between current resistance values and corresponding statuses of alarm

loops of the Type 1.

The wiring diagram for including fire smoke (normally open) detectors into alarm loops of the Type 1 is

presented on the page 64.

Combined Fire Single Threshold Alarm Loop (Type 2)

A loop of the Type 2 (Combined Fire Single Threshold) is intended to involve fire smoke (normally

open) and heat (normally closed) detectors. This loop is considered to be in one of the following status-

es:

Armed The alarm loop is monitored, its resistance being normal

Disarmed The alarm loop is not monitored

Arming Delay The programmed Arming Delay has not been expired

Fire Prealarm Either activation of a heat detector or repeated activation of a smoke

detector is recognized within the loop

Fire Alarm The Alarm Delay has expired after single detector actuation

Short Circuit Failure

The resistance of the loop is less than 100 Ω

Open Circuit Failure

The resistance of the loop is more than 16 KΩ

Arming Failed An attempt to arm the loop has failed because the loop is broken

A heat detector having actuated, the loop switches to the Fire Prealarm status.

When a smoke detector has actuated, the Signal-10 generates a FIRE SIGNAL message and repeat-

edly queries condition of the loop (see above, for a loop 1). If detector actuation is confirmed, the loop

switches to the Fire Prealarm status.

The loop can switch from the Fire Prealarm status to the Fire Alarm status after expiring of the given

Alarm Delay. If the value of the given Alarm Delay equals to zero, then the loop will switch from the Fire

Prealarm status to the Fire Alarm status immediately. The Alarm Delay value of 255 s (maximum possi-

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