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Detailed Information on I/O Table Creation Errors Section 8-5
Precautions in Setting Rack First Words
• Be sure to make first word settings so that allocated words do not overlap.
The first word setting for a rack can be any address from CIO 0000 to
CIO 0900. If the same word is allocated to two Racks, the I/O tables can-
not be created and the Duplication Error Flag (A26103) in the I/O Table
Error Information will turn ON.
• Always register the I/O table after installing an I/O Unit, after setting a rack
number, or after setting the first word allocation for a Rack. The I/O Table
Registration operation registers the I/O words allocated to the Racks.
• I/O words will not be allocated to empty slots. If an I/O Unit will be
installed later, reserve words for the empty slot by changing the I/O table
with a Programming Device’s I/O Table Change Operation.
• If the actual system configuration is changed after registering the I/O table
so that the number of words or I/O type does not match the I/O table, an
I/O verification error (A40209) or I/O setting error (A40110) will occur. A
CS-series CPU Bus Unit Setting Error (A40203) or Special I/O Unit Set-
ting Error (A40202) may occur as well.
• When a Unit is removed, words can be reserved for the missing Unit using
the I/O Table Change Operation. If a Unit is changed or added, all of the
words in the program following that Unit’s allocated words will be changed
and the I/O Table Registration Operation will have to be performed again.
8-5 Detailed Information on I/O Table Creation Errors
With a CJ1-H CPU Unit, the contents of A261 provides information on the Unit
causing the error whenever one occurs when creating the I/O tables from the
Programming Console or CX-Programmer. This information will make it easier
to find the Unit causing the problem with troubleshooting I/O tables. Refer to
SECTION 11 Troubleshooting for actual procedures.
Note This function does not exist in CJ1-CPU@@ CPU Units.
Name Address Contents When
changing
to RUN
mode
At
startup
Setting
timing
Word Bit
CPU Bus Unit Setup
Area Initialization
Error Flag
A261 00 ON: Error in CPU Bus Unit Setup
Turns OFF when I/O tables are generated normally.
Held Cleared When I/O
tables are
created
I/O Overflow Flag 02 ON: Overflow in maximum number of I/O points.
Turns OFF when I/O tables are generated normally.
Duplication Error Flag 03 ON: The same unit number was used more than
once.
Turns OFF when I/O tables are generated normally.
I/O Bus Error Flag 04 ON: I/O bus error
Turns OFF when I/O tables are generated normally.
Special I/O Unit Error
Flag
07 ON: Error in a Special I/O Unit
Turns OFF when I/O tables are generated normally.
I/O Unconfirmed Error
Flag
09 ON: I/O detection has not been completed.
Turns OFF when I/O tables are generated normally.
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