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CPU Unit Operation Section 2-4
Cyclic Refreshing I/O is refreshed after all the instructions in executable tasks have been exe-
cuted.
Immediate Refreshing When the immediate refreshing variation of an instruction is specified and the
instruction’s operand is an input bit or word in the Built-in I/O Area, the word
containing the bit or the word itself will be refreshed.
Note (1) Immediate refreshing is possible only for the Built-in I/O Area. Use
IORF(097) for I/O on CP/CPM1A-series Expansion Units and Expansion
I/O Units.
(2) Refreshing Range
• Bit Operands
The ON/OFF status of the 16 I/O points allocated to the word contain-
ing the specified bit will be refreshed.
• Word Operands
The ON/OFF status of the 16 I/O points allocated to the specified word
will be refreshed.
(3) Refresh Timing
• Input or source operands are read just before the instruction is execut-
ed.
• Output or destination (results) operands are written just after the in-
struction is executed.
(4) Using instructions with the immediate refresh option, instruction execu-
tion time will be increased, increasing the overall cycle time. Be sure to
confirm that this will not adversely affect system operation.
IORF(097) Refreshing When IORF(097) (I/O REFRESH) is executed, the I/O bits in the specified
range of words are refreshed. IORF(097) can be used for CP/CPM1A-series
Expansion Units and CP/CPM1A-series Expansion I/O Units.
END(001)
END(001)
END(001)
Task
Task
Task
I/O refresh period
Cycle
I/O terminal
status
15
0
!LD 0.00
015
!OUT 100.00
015
!MOV 1 101
11
7
11
7
Immediate refresh
I/O terminal status (built-in I/O)
CIO 0
CIO 101
CIO 1
CIO 100
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