Specify the scan list -9, Specify the scan list – Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers User Manual

Page 81

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Publication 1785-UM012D-EN-P - July 2005

Communicating with Remote I/O 6-9

Specify the Scan List

A scan list is a map of the I/O devices being scanned by the scanner channel.
For the channel to communicate with the I/O devices connected to it, you
must create a scan list.

A scan list includes the following:

To

Do the Following

Create a scan list

Make sure the controller is in Remote Program or Program mode.
1.Make sure that you defined an I/O status file on the controller configuration
screen (see page 6-7).
2.Accept any edits made to the channel configuration.
3.Use the autoconfiguration function
If you have errors when you accept edits, clear the scan list and accept edits
again.
If you encounter the error message “Resource not Available,” you have not
defined an I/O status file. Define the I/O status file and try automatic
configuration again.

Insert an entry into the
scan list

Make sure the controller is in Remote Program, Program, or Remote Run mode.
1.Position the cursor at the place on the scan list where you want to insert an
entry.
2.Insert an entry into the list and enter the appropriate values for the list.
Important: If incorrect information is entered for an entry, the controller will
not display the new configuration when you save edits.

Delete an entry for the
scan list

Make sure the controller is in Remote Program, Program, or Remote Run mode.
1.Position the cursor at the place on the scan list where you want to delete an
entry.
2.Delete the entry from the list.
Important: If incorrect information is entered for an entry, the controller will
not display the new configuration when you save edits.

For this Field:

A Scan List Contains

Rack address

1-3 octal (PLC-5/11, -5/20, -5/20E controllers)
1-7 octal (PLC-5/30 controllers)
1-17 octal (PLC-5/40, -5/40L, -5/40E controllers)
1-27 octal (PLC-5/60, -5/60L, -5/80, -5/80E controllers)
If complementary I/O is enabled, a C appears before the complemented rack
address.

Starting group

0, 2, 4, or 6

Rack size

1/2, 1/4, 3/4, or FULL

Range

Automatically calculated based on rack address, starting module group and chassis
size.
An asterisk (*) after a range indicates the last valid rack entry.

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