Appendix B Task Codes Specifications
Task Subcommand Response task code Return code Error cause
code Code Code Code
H23 Write to HI-LADDER H02 Not-executable H03 ROM memory H01 Program memory is ROM
area Occupancy code
mismatch
H03 Local station is READ-occupying CPU
Not occupied H07 Local station is not occupying CPU
CPU is running H0B CPU is running and “modify during
RUN” mode is not set
Write to parameter H03 Normal execution H00
area (B) Abnormal task code H01 Abnormal address H04 Transfer address is outside the designated
range of parameter area (B)
Abnormal number of
steps/words
H05 Number of transfer steps are outside the
designated range
Memory over H09 “Address + number of steps” exceeds the
parameter area
Not-executable H03 Occupancy code
mismatch
H03 Local station is READ-occupying CPU
Not occupied H07 Local station is not occupying CPU
CPU is running H0B CPU is running and “modify during
RUN” mode is not set
Undefined H04 to
HFF
Abnormal task code H01 Undefined
subcommand
H02 Undefined subcommand is set.
None Abnormal task code H01 Abnormal number of
steps/words
H05 Only the task code is input.
H26 Memory assignment H00 Normal execution H00
(Fixed) Abnormal task code H01 Memory size over H0A Memory assignment total has exceeded
the physical memory capacity.
Not-executable H03 Occupancy code
mismatch
H03 READ-occupied by local station.
Not occupied H07 Local station is not occupying CPU.
CPU is running H0B CPU is running and “modify during
RUN” mode is not set.
Undefined H01 to
HFF
Abnormal task code H01 Undefined
subcommand
H02 Undefined subcommand is set.
None Abnormal task code H01 Abnormal number of
steps/words
H05 Task code input-parameter length is too
short.
H27 End of parameter Normal execution H00
change Not-executable H03 Occupancy code
mismatch
H03 READ-occupying by local station.
Not occupied H07 Local station is not occupying CPU.
CPU is running H0B CPU is running and “modify during
RUN” mode is not set.
H28 Change set value of H02 Normal execution H00
timer counter (Fixed) Abnormal task code H01 Undefined
subcommand
H02
Subcommand is other than 02H.
Modification code is 08H or above.
Abnormal address H04
Address is abnormal.
Abnormal number of
steps/words
H05
Task code input-parameter length is too
short.
Abnormal I/O code H06
I/O code is abnormal.
Time base is H04 or above.
Abnormal I/O number H07
I/O number is abnormal.
Timer counter number is 512 or above.
The 1st set value of watchdog (constant)
is greater than or equal to the 2nd set
value (constant).
0.01 second, 0.1 second or 1.0 second
was set as the time base when timer
counter number was 256 or above.
0.01 second was set as the time base
when timer counter number was 64 or
above.
Not-executable H03 Inconsistent parameter H02 The timer of the timer-counter number is
used by HI-FLOW.
Occupancy code
mismatch
H03 READ-occupying by local station
Not occupied H07 Not occupied by local station.
B-47
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