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Bus Extension to S100 I/O
You can use the following basic information when you install an electrical bus extension.
How to install an optical bus extension is described in S100 I/O Hardware Reference Manual.
Assembly
The different parts of the bus extension are mainly factory assembled. These include:
• Bus master module which is included in PM511 in controller subrack
• Slave boards DSBC 174 or DSBC 176, located in each I/O subrack (two per I/O subrack in
case of S100 I/O bus extension redundancy, only valid for DSBC 174)
• Ribbon cables connecting subracks within a cabinet.
You are supposed to make the interconnection of the bus extension between cabinets.
Cabinets should be arranged side by side in a designated order. Ribbon cables with adapted lengths are enclosed at delivery. The cables are marked with item designation at the connectors.

Use these cables!
It is important not to exceed the maximum bus length 12 m, that is, the total length of the cables used may not exceed 12 m.
Check that a plug-in termination unit DSTC 176 is located only on the last bus extender slave board in the chain. See Figure 2-20.
Electric Installation
Make use of the enclosed ribbon cables to interconnect the bus between the cabinets. Such a cable is connected at one end and temporarily wound up and hung up on the wall side.
Figure 2-20 shows an example of a non-redundant installation. The actual ribbon cables are illustrated with a thick line.