Installation Instruction VARIODYN
®
 D1 System 
 
10  FB 798663.GB0 / 05.19 
  Redundancy of the VARIODYN
®
 D1 System 
Alternatively, the VARIODYN
®
 D1 System can also have a redundant structure. The devices listed in the diagram 
are required for this purpose. 
 
 
 
Fig. 2: Redundancy of the VARIODYN
®
 D1 System 
 
 
ESSER fire alarm control panel (FACP) 
Serial essernet
®
 Interface 
 
TWI-RS232 adapter (Part No. 583386.21)  
 
 
 
•  The technical performance characteristics may be limited by standards, directives and local 
requirements. 
•  For more information on the devices and accessories, see documentation  
(Part No. 798683.GB0 / 798678.GB0).