Rockwell Automation 57C570 AutoMax PC3000 User Manual - Manual (Page 152)

13Ć2
13.2 Configuring the Remote I/O Racks
Once you have your I/O modules laid out in chassis with adapters
and have developed your I/O system addressing, you must enter
this I/O rack information into the PC3000 remote I/O scanner
interface. Assign variable names to the applicable module registers
and/or bits using the Variable Configurator form and load data into
these locations.
Each I/O rack has an input image table and an output image table.
You use these tables to store input data and to extract output data
for the rack. You must assign variable names to each input and
output word and/or bit you use in a rack. You will then be able to
use these names in your control programs.
Also, each I/O rack has status information associated with it. The
status information can be a whole register or a bit within a register
that you can monitor to detect rack communication and errors,
among other information. You must assign a variable name to each
status item so you can incorporate the variable into your control
program.
13.2.1 Assigning Variable Names to the Inputs and
Outputs in the Remote Racks
Each I/O group in an I/O rack has two corresponding registers in the
scanner PC3000, one register for inputs and one for outputs. These
registers are 16Ćbit words.
Before the scanner can communicate with an I/O rack you must
assign a variable name to the input and output image register for
each I/O group used in the I/O rack.
See Appendix D, Register Assignment Map" for a complete listing
of the registers and bits associated with the I/O image table.
To assign variable names to the input and output image table
registers, use the Scanner's Variable Configurator form. When you
choose the Input/Output Image Table view, you see a form similar to
the one shown in figure 13.2.