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Auxiliary Area (A)
Section 4-11
2.
If a Holding Area bit is used but not programmed as a self-maintaining bit
as in the following diagram, the bit will be turned OFF by execution condi-
tion A when the power is reset.
3.
H512 to H1535 are used as a Function Block Holding Area. These words
can be used only for function block instances (internally allocated variable
area). These words cannot be specified as instruction operands in the user
program.
Precautions
When a Holding Area bit is used in a KEEP(011) instruction, never use a nor-
mally closed condition for the reset input if the input device uses an AC power
supply. When the power supply goes OFF or is temporarily interrupted, the
input will go OFF before the PLC’s internal power supply and the Holding Area
bit will be reset.
Instead, use a configuration like the one shown below.
There are no restrictions in the order of using bit address or in the number of
N.C. or N.O. conditions that can be programmed.
4-11 Auxiliary Area (A)
The Auxiliary Area contains 960 words with addresses ranging from A0 to
A959). These words are preassigned as flags and control bits to monitor and
control operation.
A0 through A447 are read-only, but A448 through A959 can be read or written
from the program or the CX-Programmer.
Refer to Appendix C Auxiliary Area Allocations by Function and Appendix D
Auxiliary Area Allocations by Address for Auxiliary Area functions.
Forcing Bit Status
Read/write bits in the Auxiliary Area cannot be force-set and force-reset con-
tinuously.
H0.00
H0.00
A
H0.00
Input
Unit
Set input
Reset input
H1.00
Input
Unit
Set input
Reset input
H1.00
Содержание CP1H-CPU - 05-2006
Страница 1: ...OPERATION MANUAL CP1H CPU Unit SYSMAC CP Series CP1H X40D CP1H XA40D CP1H Y20DT D Cat No W450 E1 02...
Страница 2: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised May 2006...
Страница 3: ...iv...
Страница 11: ...xii TABLE OF CONTENTS...
Страница 15: ...xvi...
Страница 19: ...xx...
Страница 31: ...xxxii Conformance to EC Directives 6...
Страница 71: ...40 Function Blocks Section 1 5...
Страница 133: ...102 Computing the Cycle Time Section 2 7...
Страница 169: ...138 CPM1A Expansion I O Unit Wiring Section 3 6...
Страница 411: ...380 Clock Section 6 8...
Страница 519: ...488 Replacing User serviceable Parts Section 10 2...
Страница 527: ...496 Standard Models Appendix A...
Страница 535: ...504 Dimensions Diagrams Appendix B...
Страница 628: ...597 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 629: ...598 Connections to Serial Communications Option Boards Appendix F...
Страница 659: ...628 PLC Setup Appendix G...
Страница 665: ...634 Index work words 159 write protection 370...
Страница 667: ...636 Revision History...