Dual Safety Installation
asafeinstall_dgb, AutroSafe Interactive Fire Detection System, Release 4,
116-P-ASAFE-INSTALL/DGB, Doc-1004796-2, 2021-08-23, Autronica Fire and Security AS
Page 54
12. Dual Safety Installation
12.1 Dual Safety System Overview
An AutroSafe system using the Dual Safety concept consists of a
Primary System and a Secondary System. The purpose of the concept
is to ensure that the Secondary System takes over the control of the
detection loops if the Primary System or parts of it is lost for any reason.
To achieve this, the redundant loop control interface AutroKeeper BN-
180 is required.
An AutroMaster can communicate with both the Primary and Secondary
System via AutroCom.
The connections that are to be used between the Primary/Secondary
System and the detection loops depend on distances and the number of
Loop Driver Modules/detection loops used.
12.2 Rules of Thumb
Note that these rules of thumb goes for both systems in a Dual Safety
configuration:
• Up to 6 Loop Driver Modules can be connected to one I/O stack
• Up to 12 Loop Driver Modules can be connected to one panel
• Up to 6 Loop Driver Modules can be connected to one panel
directly (one I/O stack) if the cable length between the panel’s
main board AL_Com+ port and the I/O stack is less than 3
meters.
• Up to 12 Loop Driver Modules can be connected to one panel
through AutroFieldBus (up to 12 I/O stacks). This solution has
to be used if the cable length between the panel’s main board
and the I/O stack exceeds 3 meters, but can also be used for
cable lengths less than 3 meters.
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