schmersal bp408, Руководство по установке

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Installation manual of system “bp408” - Electrical connection 79
7.15 Connection of the emergency call system
Emergency call devices ususally require a telephone connection. If a separate
connection is available for the emergency call system, the wiring is as specified in
the description of the emergency call system. Mostly, however, the emergency call
system has to share the telephone line with the modem of the control system. In
this case, it must be ensured that the emergency call system has priority. Some
emergency call systems provide a switched-through connection for a remote
diagnosis system as long as there is no emergency call. If such a connection to
the emergency call system is not available, a so-called emergency call manager
must be appointed. He immediately interrupts an existing remote diagnosis
connection when an emergency call occurs and makes the telephone connection
available to the emergency call system. There is no general scheme for connecting
an emergency call system. Therefore, refer to this information from the enclosed
circuit diagrams and the documentation of the emergency call system.