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PROFIBUS DP, FOUNDATION Fieldbus H1, FOUNDATION Fieldbus High Speed

Ethernet and dual RS-232C ports are some examples of unit types available for

connection to the CEX-Bus. It is possible to use redundant communication

interfaces, for example PROFIBUS DP.

Figure 6 on page 42 provides examples of various ways to connect the S800 I/O

units. It can be seen, at the top right-hand area of Figure 6 on page 42, that one

cluster (or group) of units (maximum number of units per cluster is 12) is connected

to the electrical ModuleBus of an AC 800M Controller. However, a further seven

clusters (each comprising up to 12 units) can be added to the optical ModuleBus,

thus achieving a total count of 96 units per AC 800M Controller when using only

the ModuleBus.

To the left on Figure 6 on page 42, there is a PROFIBUS DP segment. This allows

for a large increase in the numbers of units connected to each AC 800M Controller.

Here the segment is shown as having an FCI unit (type CI801), connected to the

PROFIBUS DP network. The use of FCI units allows the selection of units from

several I/O families.

Figure 7 on page 43 shows another example for I/O units based on a

FOUNDATION Fieldbus High Speed Ethernet (FF HSE).

For further examples refer to the relevant documentation for the I/O system in

question.

Connecting S800 I/O units (using the ModuleBus) to an AC 800M Controller

mounted with a PM851/PM851A processor unit is restricted to, one electrical

ModuleBus cluster and one optical ModuleBus cluster.