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[craigwilson]

Data transfer between the PLCs and the HMI can be accomplished using many different communication technologies. Currently available technologies include:

• Hard-wired: this connection type utilises the RS-232 and RS-485 communication standards and takes advantage of wiring networks found in most industrial plant installations. Each of our PLCs are equipped with a number of RS-232 and RS-485 communication ports.
• Dial-up: this connection type uses the existing telephone line infrastructure to transfer data. In addition to a PLC RS-232 port, an external dial-up modem is required at both the HMI and the PLC ends. The 5901 Dial-Up modem is ideal for this type of communication.
• Wireless (radio): this communication type utilises a number of radio technologies, including UHF and Spread-Spectrum. In all cases, a radio is required at both the HMI and the PLC ends.

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