Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 103)

Publication 1785-UM012D-EN-P - July 2005
Communicating with a PLC-5 Adapter Channel 7-5
Specify the Discrete Transfer Configuration Files
The discrete transfer configuration files (output source file and the input
destination file) are the main vehicles for discrete data and block-transfer
status bits exchange between a PLC-5 adapter channel and a scanner channel
or a supervisory controller (see ).
The discrete transfer configuration files can be integer, BCD, or binary data
file types. Be sure to create the files specified for the input source and output
source prior to specifying them. If they do not exist at the time of
configuration, you will receive an error when trying to accept edits.
Last rack Notifies the supervisory controller that
this is the last chassis
This information is important when the
supervisory controller is a PLC-2
controller.
Select the check box if this is the last rack.
Starting group The starting group number of the rack Cursor to the field and enter the number
Valid entries are: 0, 2, 4 or 6.
Rack size The number of I/O words to exchange
with the supervisory controller Cursor to the field and select the rack size, which depends on the
starting group you selected above:
If you want to communicate using:
2 words - select 1/4 (starting group 6)
4 words - select 1/2 (starting group 4)
6 words - select 3/4 (starting group 2)
8 words - select FULL (starting group 0)
For example, if you choose starting group 6, you can only transfer
2 words. If you choose starting group 4, you can transfer 4 or 2
words.
In this Field Define By Doing the Following