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S800 I/O Configuration - Basic Rules and Examples Section 3 Configuration

38 3BSE056248

Direct redundant I/O to redundant AC 800M Controllers

In total max 42 pairs of modules but limited by:

• TB840A Power supply capability.

• Required scan cycle time.

• Required CPU load.

Supported redundant modules:

DI840, DO840, AI843, AO845, DP840, AI845. AI880A, DI880, DI880 are supported if

PM865. The optical ModuleBus can be configured for long distances and in star

configurations using TB825 see Long distance distribution in star as Direct I/O to AC 800M

on page 42. It is possible to mix clusters with and without redundant I/O, but not on the same

cluster. See non-redundant I/O for information.

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Siemens EF 837 Series Specifiche Pagina 38