Arrangement for controlling an alarm display lamps of a central alarm display field for monitoring systems, in particular remote monitoring installations in according to direct transmission systems

摘要

An alarm system with a large number of alarm contacts has a corresponding display signalling a number of alarm conditions. Each alarm cell has a contact and associated indicator. The central station has a single indicator and a reset key operating together with an alarm start memory and an alarm end memory. When an alarm contact is closed the main indicator flickers until the reset key is operated to produce permanent indication. A second alarm contact closure produces a similar effect.