Creating I/O Tables - Omron SYSMAC CS Series Operation Manual

I/O Allocations
8-1-2

Creating I/O Tables

Creating I/O Tables Based on Mounted Units
382
There are two ways to allocate I/O memory to CS-series Units.
• Create the I/O tables online based on the Units actually mounted to the
PLC. This can be done from either the CX-Programmer or a Programming
Console. The Programming Device is connected online and then the I/O
tables are created based on the Units that are mounted.
• Create the I/O tables offline without basing them directly on the mounted
Units and then transfer the I/O tables to the PLC. This is done offline on
the CX-Programmer.
The word addresses, number of words, and mounting slot for each Unit are
registered in the CPU Unit as I/O tables. Data is exchanged between the Units
and the CPU Unit, e.g., to help prevent mistakes in mounting when replacing
Units.
Connect a Programming Console or the CX-Programmer to a CPU Unit in a
PLC with all the Units mounted and create the I/O tables. In the I/O table cre-
ation operation, information on the Unit models and mounting locations are
registered in the parameter area of the CPU Unit as the registered I/O tables
for all Units mounted to the basic PLC system and SYSMAC BUS Remote I/O
Racks.
CX-Programmer or Programming Console
I/O table creation operation
Information on models and
Online
positions of mounted Units:
Registered I/O table
I/O Memory Allocations
When I/O memory is allocated automatically, words are automatically allo-
cated to Units in the order they are mounted to the Racks. Words are allo-
cated to Units from left to right starting on Rack 0 and then left to right on each
Rack through Rack 7.
Rack 0
In order from Rack 0
Rack 1
through Rack 7
CPU Unit
Registered I/O tables written to
parameter area in CPU Unit.
In order from left to right starting with slot 00
In order from left to right starting with slot 00
Section 8-1