Hitachi EH-150 Applications Manual page 167

Task code HA4
Function
Reads the monitor data by designating N random points (words) of I/O numbers.
* This task code can also be executed when the CPU is not occupied.
* The I/O data of EH-150 outside the range returns all off (0).
Execution condition
CPU status
STOP RUN
Format
Request
1st point (word)
HA4 (a) (b)
(a) Number of bits/number of words H01 to H3F (1 to 60)
(b) I/O code
Refer to the task code H40.
(c) I/O number
Response
Monitor data (1st point, 1st word)
(a) HA4 (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) Monitor data (refer to below for details)
(Bit data)
0 0 0
1 point
(Word data)
1 word
Monitoring with I/O number designation
(N random points)
HALT ERROR
(c)
Monitor data (Nth point, Nth word)
(b)
"0" or "1"
H0000 to HFFFF
Appendix B Task Codes Specifications
READ occupancy Occupancy
WRITE occupancy status
Not occupied
Nth point (word)
(b) (c)
B-42
Classification I/O control