Rockwell-automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM Uživatelský manuál stáhnout pdf (Strana 329)

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Publication AG-UM008C-EN-P - February 2005

Using Dial-up Telephone Communication 10-9

Report-by-Exception and/or

Master Station-Initiated

Communication

Report-by-exception communication refers to the remote stations

initiating a dial-up connection to the master station upon change of

input status or process data in order to update the master station’s

data table.

Master station-initiated communication refers to the master station

initiating the dial-up connections to each of the remote stations on a

round robin or time-scheduled basis in order to update the master

station’s data table.

A combination of report-by-exception and master station-initiated

communication is possible but requires two communication ports and

modems (one for dial-in and one for dial-out) at the master station in

order to be effective. This can be accomplished using a 1785-KE

module with a PLC-5 processor, a 1747-KE module with an SLC 5/03,

or a dual-port processor such as a MicroLogix 1500 LRP or a

CompactLogix L31.

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