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2-2 Program Memory
Program Memory is contained in the CPU and is divided into two areas, the PC
Setup and the Program Area. There are 32K words of Program Memory avail-
able in the CV500, CVM1-CPU01-EV2, or CVM1-CPU11-EV2, and 64K words
available in the CV1000, CV2000, or CVM1-CPU21-EV2. The first 2K words in
both groups of PCs is taken up by the PC Setup, leaving 30K words in the
CV500, CVM1-CPU01-EV2, or CVM1-CPU11-EV2 Program Area, and 62K
words in the CV1000, CV2000, or CVM1-CPU21-EV2 Program Area. (One word
contains two bytes.)
Program Memory is backed up by the CPU battery, so data will not be lost during
a power interruption.
Note The program memory chip is built into CV-series PCs and does not need to be
installed by the user.
This area of Program Memory contains the settings described in
Section 7 PC
Setup
. Basic options in PC operation (such as the method of I/O refreshing and
the PC mode at start-up) are specified in these settings.
The PC Setup is stored in EEPROM, so this data will not be lost even if the back-
up battery power is interrupted.
This area of Program Memory contains the SFC and/or ladder program.
The following table shows the maximum program size (combined total of the
SFC and ladder programs) when SFC programming is used and the maximum
number of steps, transitions, and actions in the SFC program.
PC Program capacity SFC steps SFC transitions SFC actions
CV500 30K words 512 512 1,024
CV1000 62K words 1,024 1,024 2,048
CV2000 62K words 1,024 1,024 2,048
CVM1-CPU01/11-EV2 30K words
None (SFC programming is not supported.)
CVM1-CPU21-EV2 62K words
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