Appendix B Task Codes Specifications
Task code
H16
CPU occupancy/cancel
Classification
CPU control
Function
Declares that the user memory will be accessed. The user memory cannot be accessed by the host unless the CPU is occupied
using this task code. Also, depending on the function selection, it performs the same processing as the parameter
modification completion processing (task code H27).
Execution condition
CPU status
STOP RUN HALT
ERROR
Function
H01
{
{
{
{
READ occupancy
Occupancy
selection
×
×
×
×
WRITE occupancy
status
sub-
H02
×
×
×
×
READ occupancy
command
{
{
{
{
WRITE occupancy
H05
{
{
{
{
READ occupancy
{
{
{
{
WRITE occupancy
H06
{
*1
{
*1
{
*1
{
*1
READ occupancy
{
{
{
{
WRITE occupancy
H00
{
{
{
{
READ occupancy
{
{
{
{
WRITE occupancy
*1: It cannot be executed while the CPU is READ-occupied by another station.
Format
Request
H16
(a)
(a) Function selection (subcommand)
1] H01:
READ
occupancy
2] H02:
WRITE
occupancy
3]
H05: Modifies the local station occupancy mode from WRITE
occupancy to READ occupancy.
4]
H06: Modifies the local station occupancy mode from READ
occupancy to WRITE occupancy.
5]
H00: Cancels the local station occupancy.
Response
(a)
H16
(b)
(a) Response task code (H00 when executed normally)
For task codes other than the normal task codes, refer to the “response
list by task code” at the end of this chapter.
(b) User program version (H00 to HFF)
B-12
