Communication Possibilities Section 3 Configuration
154 3BSE036351-510 A
The network can utilize different and mixed link implementations such as Fast
Ethernet and PPP. It provides for full redundancy, in order to achieve high network
availability.
The AC 800M controller is always connected to the Control Network via an STP
(Shielded Twisted Pair) cable. Should the local environment be of an industrial
nature, the AC 800M / Control Network connection must be converted over to a
Fiber Optic (FO) cable. This is achieved by installing an Ethernet Switch having
both optical and electrical ports. See Figure 53 on page 153.
For more information on Control Network, see Control Network documentation.
Communication Possibilities
The processor unit (PM8XX/TP830 or PM891) contains the following
communication ports, offering the following functions:
• CN1 and CN2 are used for connection to the Control Network. Both are RJ45
ports for Ethernet (IEEE802.3) and connection is normally achieved using
category 5 shielded twisted pair cable (STP class 5). However, as mentioned
previously, within industrial environments it is recommended that all STP
cables are converted to optical fiber.
– For single or redundant CPUs and single networks: All CN1 ports are
connected to the network (CN2 can be used, but requires reconfiguration
of the communication set-up for the concerned CPU).
– For single or redundant CPUs and redundant networks: All CN1 ports are
connected to the primary network and all CN2 ports to the secondary
network.
Details on cable selection, switches and so forth, are provided in Appendix C,
Recommended Components.
PM851/PM851A is restricted to one Ethernet (CN1) port, thus redundant
Ethernet is not available.
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