Omron CPM1 Programming Manual

137
CQM1 Memory Area Functions Section 3-1
Note 1. IR and LR bits that are not used for their allocated functions can be used
as work bits.
2. At least 2,720 bits can be used as work bits. The total number of bits that
can be used depends on the configuration of the PC system.
3. When accessing a PV, TC numbers are used as word data; when access-
ing Completion Flags, they are used as bit data.
4. 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.
5. Data in DM 6144 to DM 6655 cannot be overwritten from the program.
3-1-2 IR Area
The functions of the IR area are explained below.
Input and Output Area IR area bits are allocated to terminals on Input Units and Output Units. They
reflect the ON/OFF status of input and output signals. Input bits begin at IR
00000, and output bits begin at IR 10000. With the CQM1, only IR 00000
through IR 01515 can be used as input bits and only IR 10000 through IR
11515 can be used as output bits.
For information on allocating input and output bits, refer to page 142.
Note Input bits cannot be used in output instructions. Do not use the same output
bit in more than one OUT and/or OUT NOT instruction, or the program will not
execute properly.
Work Areas With the CQM1-CPU11/21-E and CQM1-CPU41-EV1 CPU Units, any of the
bits between IR 001 and IR 243 not used for specific functions can be used as
work bits. There are a few exceptions with the CQM1-CPU42/43/44-EV1 CPU
Units, as shown in the following table.
The work bits can be used freely within the program. They can only be used
within the program, however, and not for direct external I/O. Work bits are
reset (i.e., turned OFF) when the CQM1 power supply is turned off or when
operation begins or stops.
DM area Read/write 1,024
words
DM 0000 to
DM 1023
--- DM area data can be accessed in word
units only. Word values are retained when
the power is turned off.
5,120
words
DM 1024 to
DM 6143
--- Available in CQM1-CPU4@-EV1 CPU Units
only.
4
Read-only
5
425
words
DM 6144 to
DM 6568
--- Cannot be overwritten from program.
Error history
area
5
31
words
DM 6569 to
DM 6599
--- Used to store the time of occurrence and
error code of errors that occur.
PC Setup
5
56
words
DM 6600 to
DM 6655
--- Used to store various parameters that con-
trol PC operation.
User program area (UM
area)
3,200
or
7,200
words
--- Used to store the program. Retained when
the power is turned off.
CQM1-CPU11/21-E: 3,200 words
CQM1-CPU4@-EV1: 7,200 words
Data area Size Words Bits Function
CPU Unit Bits Unavailable as Work Bits
CQM1-CPU42-EV1 IR 22000 to IR 22315
CQM1-CPU43/44-EV1 IR 23200 to IR 23915

Omron CPM1 Specifications

General

Model	CPM1
Manufacturer	Omron
Instruction Set	Basic and advanced instructions
Power Supply	100 to 240 VAC or 24 VDC
Communication	RS-232C
I/O Points	10, 20, 30, or 40 points depending on the model
Timers	Yes, multiple timers available
Counters	Yes, multiple counters available
Input Voltage	24V DC
Output Type	Relay or transistor
Number of I/O Points	10, 20, 30, 40
Communication Ports	RS-232C (optional)
Operating Temperature	0°C to 55°C
Storage Temperature	-20°C
Humidity	10% to 90% (non-condensing)
Dimensions	Varies depending on the model
Weight	Varies depending on the model
Program Memory	2048 steps (2K steps)