OPERATION MANUAL

Auxiliary Area Appendix B
Address Name Function Status Status at Write timing/
Words Bits
after
mode
change
startup Related flags,
settings
Cleared Cleared A40210
A406 All PLC Setup
Error Location
A407 A40700
to
A40712
726
A40713
to
A40715
Too Many
I/O Points,
Details
Too Many
I/O Points,
Cause
When there is a setting error in the PLC Setup, the
location of that error is written to A406 in 4-digit hexadecimal.
The location is given as the address displayed
on a Programming Console.
The CPU Unit will continue operating and the
ERR/ALM indicator on the front of the CPU Unit will
flash.
0000 to 01FF hexadecimal
(A406 will be cleared when the cause of the error is
eliminated.)
The 6 possible causes of the Too Many I/O Points
Error are listed below. The 3-digit binary value in
A40713 to A40715 indicates the cause of the error
(values 0 to 5 correspond to causes 1 to 6, below).
The 13-bit binary value in A40700 to A40712 indicates
the details: the excessive value or the duplicated unit
number.
CPU Unit operation will stop and the ERR/ALM indicator
on the front of the CPU Unit will light.
1) The number of I/O points will be written here when
the total number of I/O points set in the I/O Table
(excluding Slave Racks) exceed the maximum
allowed for the CPU Unit.
2) The number of interrupt inputs will be written here
when there are more than 32 interrupt inputs.
3) The unit number of the Slave Unit will be written
here when a unit number is duplicated or the number
of I/O points on a C500 Slave Unit exceeds 320.
4) The unit number of the I/O Terminal (excluding
Slave Racks) will be written here when a unit number
is duplicated.
5) The unit number of the Master Unit will be written
here when a unit number is duplicated or the unit
number is outside of the allowed setting range.
6) The number of Racks will be written here when the
number of Expansion I/O Racks exceeds the maximum.
(The relevant value will be written here (A40700 to
A40712) when the error occurs. These bits will be
cleared when the error is cleared.)
The 3-digit binary value of these bits indicates the
cause of the Too Many I/O Points Error and shows the
meaning of the value written to bits A40700 to
A40712.
Values of 000 to 101 (0 to 5) correspond to causes 1
through 6 described in “Too Many I/O Points, Cause 1,”
above.
000: Too many I/O total
001: Too many interrupt I/O
010: Duplicate Remote I/O Slave Unit unit numbers or
too many I/O on C500 Remote I/O Slave Units
(more than 320)
011: Duplicate I/O Terminal unit numbers
100: Duplicate Remote I/O Master Unit unit numbers
or undefined unit numbers (not 0 or 1)
101: Too many Racks
(These bits will be cleared when the error is cleared.)
Cleared Cleared A40111, A40713 to
A40715
Cleared Cleared ---