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CQM1 Memory Area Functions Section 3-1
one for the timer instruction, but rather is reset only when the reset input
goes ON.
3-1-9 DM Area
Data is accessed in word units. As shown below, the DM area contains both
an area that can be freely used and areas with specific functions.
Note 1. The CQM1-CPU11-E and CQM1-CPU21-E do not support DM 1024
through DM 6143.
2. Turning ON pin 1 of the DIP switch on the CPU Unit will prevent writing
even by means of peripheral devices.
Fixed DM contents, the PC Setup, the user program, and the instructions
table can all be saved to and loaded from a Memory Cassette as a single unit.
Refer to page 149 for details.
!Caution Although the CQM1-CPU11-E and CQM1-CPU21-E do not support DM 1024
through DM 6143, an error will not occur if they are addressed. Any attempt to
write to these words will have no effect and any reads will produce all zeros.
3-1-10 UM Area
The UM area stores the user’s program. UM area contents can be read and
written only as program data, and not as words. The following table shows the
size of the UM area in the CQM1 CPU Units.
DM0000
DM1024
DM6144
DM6569
DM6600
DM6655
(see note 1)
Fixed DM
Error Log
PC Setup
This area has no specific functions and can be used
freely. Both reading and writing are possible from the
program.
This area cannot be written from the program. It is used
for storing information that is not to be changed. Writing
can be executed by means of peripheral devices only.
This area stores the error log. The user can only read this
area, and cannot write into it.
This area stores information related to CQM1 operation.
The settings are made by means of peripheral devices.
(see note 2)
(see note 2)
CPU Unit Model UM area size
CQM1-CPU11/21-E 3.2 KW
CQM1-CPU4@-EV1 7.2 KW
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