Rockwell Automation 57C423 Common Memory Module - Manual (Page 23)

5Ć3
program. Verify that any IOREAD functions and IOWRITE
statements are using valid addresses.
If IOREAD functions and IOWRITE statements are using
valid addresses or if the error message in question was
51" through 58", use the I/O MONITOR function to
display the registers on the memory module. Remember
to specify the correct logical slot.
If you can monitor the inputs, the problem lies in the
application software (proceed to step 3). If you cannot
monitor the inputs, the problem lies in the hardware
(proceed to step 4).
Step 3. Verify that the variable names are consistent with what is
used in the application task.
If you are using the AutoMax Programming Executive
Version 2.1 or earlier, verify that the variables defined by
IODEF and MEMDEF statements in the configuration task
match the variable names used in the application task.
In AutoMax Version 3.0 or later, verify the information on
the Variable Configurator form" (screen)is consistent with
the variable names used in the application task.
Step 4. Verify that the hardware is working correctly.
Systematically swap out the Common Memory module,
the Processor module(s)and the backplane. Make certain
power is off before removing any module from the rack.
After each swap, if the problem has not been corrected,
replace the original item before swapping out the next
item.