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137
Holding Area (H)
Section 4-6
4.
When PLC operation is stopped when a fatal error other than an
FALS(007) error occurs. (The contents of the Work Area will be retained
when FALS(007) is executed.)
4-6
Holding Area (H)
The Holding Area contains 512 words with addresses ranging from H0 to
H511 (bits H0.00 to H511.15). These words can be used in programming.
Holding Area Initialization
Data in the Holding Area is not cleared when the power is cycled or the PLC’s
operating mode is changed from PROGRAM mode to RUN or MONITOR
mode or vice-versa.
A Holding Area bit will be cleared if it is programmed between IL(002) and
ILC(003) and the execution condition for IL(002) is OFF. To keep a bit ON
even when the execution condition for IL(002) is OFF, turn ON the bit with the
SET instruction just before IL(002).
Self-maintaining Bits
When a self-maintaining bit is programmed with a Holding Area bit, the self-
maintaining bit won’t be cleared even when the power is reset.
Note
1.
If a Holding Area bit is not used for the self-maintaining bit, the bit will be
turned OFF and the self-maintaining bit will be cleared when the power is
reset.
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.
H0.00
H0.00
A
H0.00
Input
Unit
Set input
Reset input
H1.00
Содержание CP1L-L14D Series
Страница 2: ...CP1L L14D CP1L L20D CP1L M30D CP1L M40D CP1L CPU Unit Operation Manual Revised June 2007...
Страница 3: ...iv...
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Страница 13: ...xiv TABLE OF CONTENTS...
Страница 21: ...xxii...
Страница 33: ...xxxiv Conformance to EC Directives 6...
Страница 65: ...32 Function Blocks Section 1 5...
Страница 153: ...120 CP CPM1A series Expansion I O Unit Wiring Section 3 6...
Страница 523: ...490 Troubleshooting Unit Errors Section 9 4...
Страница 531: ...498 Replacing User serviceable Parts Section 10 2...
Страница 563: ...530 Auxiliary Area Allocations by Function Appendix C...
Страница 611: ...578 Auxiliary Area Allocations by Address Appendix D...
Страница 638: ...605 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Страница 639: ...606 Connections to Serial Communications Option Boards Appendix F...
Страница 669: ...636 Index...
Страница 671: ...638 Revision History...