Rockwell-automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM Uživatelský manuál stáhnout pdf (Strana 254)

100

101

Publication AG-UM008C-EN-P - February 2005

7-28 Configuring Logix Controllers

Messaging

Messaging can occur between:

• a master station and a slave station,

• a slave station and its master station (see Polled

Report-by-Exception),

• slave stations or between two controllers connected via a

point-to-point link.

Master Station to Slave Station

A Logix master station communicates with the slave stations that are

connected to it via modems in a point-to-multipoint configuration. A

master station sends a slave station message to receive status or issue

commands. For sample messaging ladder logic to use as a guide when

using Standard or Message-based Polling Modes, see page

E-19.

Polled Report-by-Exception

Slave stations can gather information from the I/O points they are

responsible for and can send any anomalous readings to the master

station. To do this, write ladder logic in the slave station to monitor

certain conditions and send the data in an MSG instruction to the

master station. For sample messaging ladder logic to use as a guide

when using a Logix as a slave, see page

E-21.

9. Enter in the path

to the remote

controller.

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