53
CPU Unit Operation
Section 2-4
2-4-3
I/O Refresh Methods
I/O for CPU Unit built-in I/O and I/O on CP-series Expansion Units and Expan-
sion I/O Units is performed at the following times.
1,2,3...
1.
Cyclic refresh period
2.
When instructions with an immediate refresh variation are executed
3.
When IORF(097) is executed
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-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 executed.
• Output or destination (results) operands are written just after the in-
struction is executed.
END(001)
END(001)
END(001)
Task
Task
Task
I/O refresh period
Cycle
I/O terminal
status
15
0
!LD
0.00
0
15
!OUT
100.00
0
15
!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
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
Page 4: ...iv...
Page 10: ...x...
Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
Page 855: ......