
Section 3 Configuration S800 I/O Configuration - Basic Rules and Examples
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HI redundant or hot replacement I/O to redundant PM865
In total max 42 pairs of modules but limited by:
• TB840A Power supply capability.
• Required scan cycle time.
• Required CPU load.
Supported modules:
DI840, DO840, AI843, AO845, DP840, DI880, DO880, AI845, AI880A. 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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