Omron CPM2B ユーザーズマニュアル

Most data areas in the CPM2B can be accessed as bits or words. (The TR area
can be accessed by bit address only and the DM area can be accessed by word
address only.)

The following diagram shows the structure of the IR area and the relationship
between bit and word addresses.

Bit number

IR 000

IR 001

IR 010

IR 011

IR 00011

Word

Bit number

IR 01107

Word Bit number

W

ord addresses

Bit addresses

15 14 13 12 11 10

9

8

7

6

5

4

3

2

1

0

Input area

160 bits
(10 words)

IR 000 to IR 009 IR 00000 to IR 00915

(See note 1.)

These bits can be allocated to the external
I/O terminals.

Output area

160 bits
(10 words)

IR 010 to IR 019 IR 01000 to IR 01915

Work area

928 bits
(58 words)

IR 020 to IR 049
IR 200 to IR 227

IR 02000 to IR 04915
IR 20000 to IR 22715

Work bits can be freely used within the
program.

SR area

448 bits
(28 words)

SR 228 to
SR 255

SR 22800 to SR 25515 These bits serve specific functions such as

flags and control bits.

TR area

8 bits

TR 0 to TR 7

These bits are used to temporarily store
ON/OFF status at program branches.

HR area

320 bits
(20 words)

HR 00 to HR 19

HR 0000 to HR 1915

These bits store data and retain their
ON/OFF status when power is turned off.

AR area

384 bits
(24 words)

AR 00 to AR 23

AR 0000 to AR 2315

These bits serve specific functions such as
flags and control bits.

LR area

256 bits
(16 words)

LR 00 to LR 15

LR 0000 to LR 1515

Used for a 1:1 data link with another PC.

Timer/Counter
area

256 bits

TIM/CNT 000 to TIM/CNT 255

The same numbers are used for both
timers and counters.

DM
area

Read/write

2,026
words

DM 0000 to DM 1999
DM 2022 to DM 2047

DM area data can be accessed in word
units only. Word values are retained when

Error log

22 words

DM 2000 to DM 2021

the power is turned off.

Read-only

456 words

DM 6144 to DM 6599

The read-only area and PC Setup cannot

PC Setup

56 words

DM 6600 to DM 6655

be overwritten from program. Change
these settings with a Programming Device.

1. Input bits IR 00108 to IR 00111 reflect the status of the DIP switch on the

CPU Board.

2. The contents of the HR area, AR area, Counter area, and read/write DM

area are backed up by the CPU Board’s backup battery or capacitor. If the
battery or capacitor discharges completely, memory contents will be re-
turned to their default settings.

3. The program and data in DM 6144 to DM 6655 are stored in flash memory.

The functions of the IR area are explained below.

IR area bits in the input and output areas are allocated to terminals on the CPU
Board and Expansion I/O Boards. They reflect the ON/OFF status of input and
output signals. Input bits begin at IR 00000, and output bits begin at IR 01000.