Appendix B Task Codes Specifications
Task
Subcommand
Response task code
Return code
Error cause
code
Code
Code
Code
Not-executable
H03
Not-occupied
H07
Local station is not occupying CPU.
Operation
error
H0C
R7C7 is off
CPU severe error
Scan time is more than 3 seconds
No
program
H0D
No program
H28
Change set value of
timer counter
H02
(Fixed)
Inconsistent
program
H0F
0.01 second, 0.1 second or 1.0 second
was set as the time base for a counter.
A counter is designated as the time base
for a timer.
Modification of second set value was
specified as the modification code when
other than WDT.
Timer is not programmed in the
designated user address.
H31
Read address
H00
Normal execution
H00
designation
program (Fixed)
Abnormal
task code
H01
Abnormal address
H04
Designated address exceeds the capacity
of installed memory.
Abnormal
number
of
steps
H05
Number of read steps is outside the range
of 1 to 60.
Not occupied
H03
Not occupied
H07
Local station is not occupying CPU.
Undefined
H01
to
HFF
Abnormal task code
H01
Undefined
subcommand
H02
Undefined subcommand is set.
H33 None
Normal
execution
H00
Not-executable
H03
Not-occupied
H07
Local station is not occupying CPU.
H35
Read memory
H00
Normal execution
H00
assignment
Not-executable
H03
Not-occupied
H07
Local station is not occupying CPU.
Reserved
subcommand
H02
H04
Do not use.
Undefined
H01,
H03, H05
to HFF
Abnormal task code
H01
Undefined
subcommand
H02
Undefined subcommand is set.
H40 None
Normal
execution
H00
Abnormal task code
H01
Abnormal number of
steps/words
H05
The requested number of points is outside
the designated range.
Abnormal
I/O
code
H06
The
requested I/O type code is undefined
or is an I/O that cannot be forced to be
set.
Abnormal I/O No.
H07
The requested I/O type code is undefined
or is an I/O that cannot be monitored.
Warning
H02
Local station is not occupying CPU.
H42 None
Normal
execution
H00
Abnormal task code
H01
Abnormal number of
steps/words
H05
The requested number of points is outside
the designated range.
Abnormal
I/O
code
H06
The
requested I/O type code is undefined.
Abnormal I/O No.
H07
The requested I/O No. is outside the
designated range.
Not-executable
H03
Not occupied
H07
Local station is not occupying CPU.
H44 None
Normal
execution
H00
Abnormal task code
H01
Abnormal number of
steps/words
H05
The requested number of points is outside
the designated range.
Abnormal
I/O
code
H06
The
requested I/O type code is undefined
or is an I/O that cannot be forced to be
set.
Abnormal I/O No.
H07
The requested I/O type code is undefined.
Warning
H02
Local station is not occupying CPU.
H45 None
Normal
execution
H00
Abnormal task code
H01
Abnormal number of
steps/words
H05
The requested number of points is outside
the designated range.
Abnormal
I/O
code
H06
The
requested I/O type code is undefined
or is an I/O that cannot be forced to be
set.
Abnormal I/O No.
H07
The requested I/O No. is outside the
designated range.
Not-executable
H03
Not occupied
H07
Local station is not occupying CPU.
B-48