5-9
5 I/O Memory
CP2E CPU Unit Software User’s Manual(W614)
5-4 Holding Area (H)
5
5-4 Holding Area (H)
The Holding Area is part of the internal memory of the CPU Unit. It is used in programming. Unlike the
input bits and output bits in the CIO Area, I/O to and from external devices is not refreshed for this area.
These words retain their content when the PLC is turned ON or the operating mode is switched
between PROGRAM mode and RUN or MONITOR mode.
The Holding Area is automatically retained in the built-in non-volatile RAM even if the power supply is
interrupted.
The Holding area contains 128 words with addresses ranging from H0 to H127.
The Holding Area words from H512 to H1535 can be set for use with function blocks. These words can-
not be specified as instruction operands in the user program.
The Holding Area is used when you want to resume operation after a power interruption using the same
status as before the power interruption.
Overview
Notation
Range
Applications
H 20
.
02
Bit number: 02
Word number: 20
I/O memory area designator: H
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