User manual

Transferring Data with the I/O Scanner
200
33002479 06 07/2008
I/O Scanner Concepts
Introduction The I/O Scanner is a feature that resides in an Ethernet (NOE 771 00, -01, -11, and
CPU 651 x0 modules). The I/O Scanner allows, through a controller, repeated
reading from and/or writing to scanned devices.
Use the I/O scanner to transfer data between network devices.
Configure the I/O Scanner with Schneider Electric’s programming package Unity
Pro. (I/O Scanner configuration information (see Configuring the Modicon Quantum
I/O Scanner with Unity, p. 205) appears elsewhere in this guide.)
Health Block Bits Each bit corresponds to an entry in the I/O Scanner table. Each entry in the table
represents one logical device.
The bits contain the health status for the Modicon Quantum I/O Scanner.
Device Control
Block
With the Device Control Block, disable an individual entry/device in the I/O Scanner
table by checking the box and setting the associated bit in Device Control Block to 1.
I/O Scan List The I/O scan list is a configuration table that identifies the targets to which repetitive
communications are authorized. While the controller is running, the Ethernet module
transfers data to and from the controller’s registers as indicated by the I/O scan list.