ABB AC 800M

I/O Systems Section 3 Configuration
98 3BSE 027 941 R301
In redundant CPU configuration, connection of S800 I/O is carried out through the
optical ModuleBus. Each CPU is connected to one TB840 on each cluster
(see Figure 29 on page 98).
Figure 29. Optical ModuleBus connection in redundant CPU configuration
Maximum of 7
clusters (groups)
Maximum of 12 x I/O units
2 x TB840
2 x TB840
2 x TB840
Optical
Local
ModuleBuses
Central/Remote
Redundant CPUs
Electrical ModuleBus can not be used
Termination is not necessary