184
Interrupt Functions
Section 5-1
b.
The following example shows duplicate processing by an interrupt
task, which interrupts processing while BSET is writing to a block of
words and yields an incorrect comparison result.
Since the interrupt occurs during BSET(071) processing and before #1234 is
set in D10, the content of D0 and D10 do not match when the comparison is
made in the interrupt task (*1) and output A remains OFF.
In the end (*2), the D0 and D10 both contain #1234 and match, but the correct
comparison result is not reflected in comparison result output A.
Prevention of Duplicate Processing
5-1-2
Input Interrupts (Direct Mode)
This function executes an interrupt task when the corresponding input signal
(up or down differentiated) is received.
Input Interrupt Bit and
Terminal Allocations
The following diagrams show the input bits and terminals that are used for the
input interrupt function in each CPU Unit.
X/XA CPU Units
The 8 input bits CIO 0.00 to CIO 0.03 and CIO 1.00 to CIO 1.03 can be used
for input interrupts.
BSET
#1234
D0
D10
CMP
D0
D10
A
1234
1234
1234
1234
1234
1234
0502
ABCD
ABCD
ABCD
1234
OFF
OFF*
1
003E 0502
D0
D1
D2
D10
A
1234*
2
OFF
Cyclic task
Interrupt task
Equals Flag
#1234 set in D0.
#1234 set in D1.
#1234 set in D2.
#1234 set in D10.
BSET(071)
processing
CMP(020)
processing
Read D0.
Read D1.
Output result.
Compare D0 and D10.
Interrupted.
Continued.
Interrupt occurs.
Interrupt completed.
Flow of Processing
BSET
#1234
D0
D10
DI
EI
Cyclic task
Disables execution of
interrupt programs.
Enables execution of
interrupt programs.
Summary of Contents for CP1H-CPU - 05-2006
Page 2: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised May 2006...
Page 3: ...iv...
Page 11: ...xii TABLE OF CONTENTS...
Page 15: ...xvi...
Page 19: ...xx...
Page 31: ...xxxii Conformance to EC Directives 6...
Page 71: ...40 Function Blocks Section 1 5...
Page 133: ...102 Computing the Cycle Time Section 2 7...
Page 169: ...138 CPM1A Expansion I O Unit Wiring Section 3 6...
Page 411: ...380 Clock Section 6 8...
Page 519: ...488 Replacing User serviceable Parts Section 10 2...
Page 527: ...496 Standard Models Appendix A...
Page 535: ...504 Dimensions Diagrams Appendix B...
Page 628: ...597 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 629: ...598 Connections to Serial Communications Option Boards Appendix F...
Page 659: ...628 PLC Setup Appendix G...
Page 665: ...634 Index work words 159 write protection 370...
Page 667: ...636 Revision History...