CI/CM PROFIBUS modules Section 3 Modules
34 M&I – AC 900F Controller
CI 930F PROFIBUS-DP Master Interface
The CI 930F provides two on-board PROFIBUS interfaces A/B for increased
availability regarding PROFIBUS communication.
CI 930F_us.png
Data arriving at CI 930F via the coupler bus are routed in parallel to both A and B
connections.
Data arriving to CI 930F via the controller coupler bus are routed in parallel to the
two PROFIBUS terminals A and B.
The first data coming in over line A or line B with a correct telegram start are
routed to the coupler bus. With simultaneity, either line A or line B is selected at
random. Testing and selection is always based on the first character. In the case of a
telegram start with error on A, the control logic in CI 930F switches to the
redundant line B. The same procedure applies vice-versa for line B.
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