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216EA62 1MRB150083R1/F 1MRB178066R1/F Excitation module

The CI820 Fieldbus Communications Interface (FCI), see Figure 2-10, is an intelligent communication interface between an Advant Controller connected to Advant Fieldbus 100 and the S800 I/O modules connected to the module bus. It is connected to a pair of redundant Twisted Pair cables (physically one to each CI820). The TB815 Connection Unit is used to connect the redundant FCI (CI820) together to a “unit” and to connect them by a Modulebus cable (TC801) or an Opto Link (optional) to the S800 I/O. The TB815 Connection Unit distribute the signal between the CI820 units, so both FCI’s got electrical inter-connection to both the redundant twisted pair buses. See Figure 2-11 for a logical picture of the Redundant FCI Inter-Connection Principle.The Advant Controller 70 station consists of a PM8101and S800 I/O modules mounted to a DIN-rail. It can communicate to an Advant Controller 400/110 station through a single or redundant media twisted pair Advant Fieldbus 100 (refer to Figure 2-12).

Termination Unit for Twisted Pair Cable

 The termination unit is used to terminate the two ends of a twisted pair segment. The termination unit is 150 ohm, and the middle of the active part of the termination unit is connected to a blue cable, which has to be grounded in one end of the segment. The ends of the termination unit are connected to gray cables, which always shall be connected to the twisted pair cables wires (one to each wire). Figure 2-14 refers.

Process Data Transfer is managed through Cyclic Data Packets (CDPs). Each CDP is configured on the communication interface for a certain signal identity, cycle time, size and direction. The process data represented by a CDP is always transferred cyclically on the Advant Fieldbus 100. The signal identity is the common identifier for corresponding send and receive CDPs on the bus. Among the sending CDPs, each CDP has a unique signal identity. Several receiving CDPs though can have the same signal identity provided they are situated in different communication interface. The cycle time determines how often the data of the CDP is transferred on the bus. When a CDP is transferred on the Advant Fieldbus 100, the interval between consecutive transfers is always the same, the cycle time. Thus, process data transfer is deterministic, regardless of which other tasks the communication interfaces perform. The number of data-bytes is the size, transferred on the bus. Possible sizes are 2, 4, 8, 16 and 32 bytes. The size of the CDP must be equal in the sending and receiving ends. Unless both the size and the signal address of corresponding CDPs are correct no transmission is performed. Direction determines whether it is a sending or receiving CDP.