SIMATIC S7-400H, SYNC SUBMODULE V4 FOR PATCH CABLES UP TO 10M

Siemens seems touse "module" and "submodule" interchangeably for this particular equipment.

it can beviewed in 2 ways:
- the equipment is a fiber-opticmodule used to synchronize 2 S7-400H CPUs in a redundant configuration.
-the equipment is a submodule that has to be inserted in the body of the CPU it is meant to synchronize.

And both descriptions are correct.

Hope this helps,
Daniel Chartier