Omron CJ2 - 02-2010 User Manual page 288

8 I/O Allocations and Unit Settings
Detailed Information on I/O Table Creation Errors
The contents of A261 (I/O Table Creation Error Details) provides information on the Unit causing the
error whenever one occurs when creating the I/O tables from the CX-Programmer. This information
will make it easier to find the Unit causing the problem with troubleshooting I/O tables.
Detailed CPU Bus Unit Setup Area
Informa- Initialization Error Flag
tion on I/O
I/O Overflow Flag
Table Cre-
ation
Errors
Duplication Error Flag
I/O Bus Error Flag
Special I/O Unit Error Flag
I/O Unconfirmed Error Flag
Precautions in Setting I/O Tables
After setting I/O tables, check for any duplications in word allocations if Units are to be changed. It is
conceivable, however, that duplications in word allocations could occur after the I/O tables have been
registered, e.g., as the result of replacing a 1-word Unit with a 2-word Unit. In this case, the extra word
needed by the new Unit would still also be allocated to the next Unit.
When the PLC is turned ON after Units have been changed, the CPU Unit checks the registered I/O
tables against the actual Units connected in the PLC. If there are any duplications, an error will occur
and it will be no longer possible to edit the I/O tables. If this happens, it will be necessary to edit the I/O
tables and transfer them again.
When I/O tables are edited, the CX-Programmer checks for any duplication in first word settings and
setting range errors to help eliminate problems.
8-18
Address
Name
Word
A261
Bit
00 ON: Error in CPU Bus Unit Setup
Turns OFF when I/O tables are generated normally.
02 ON: Overflow in maximum number of I/O points.
Turns OFF when I/O tables are generated normally.
03 ON: The same unit number was used more than once.
Turns OFF when I/O tables are generated normally.
04 ON: I/O bus error
Turns OFF when I/O tables are generated normally.
07 ON: Error in a Special I/O Unit
Turns OFF when I/O tables are generated normally.
09 ON: I/O detection has not been completed.
Turns OFF when I/O tables are generated normally.
CJ2 CPU Unit Software User's Manual
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