Memory Area Functions; Memory Area Structure - Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual

Memory Area Functions

5-1

Memory Area Functions

5-1-1 Memory Area Structure

CPM1/CPM1A
Data area
1
IR area Input area IR 000 to IR 009
(10 words)
Output area IR 010 to IR 019
(10 words)
Work area IR 200 to IR 231
(32 words)
SR area SR 232 to SR 255
(24 words)
TR area ---
2
HR area HR 00 to HR 19
(20 words)
2
AR area AR 00 to AR 15
(16 words)
1
LR area LR 00 to LR 15
(16 words)
2
Timer/Counter area TC 000 to TC 127 (timer/counter numbers)
2
DM area Read/write
DM 0000 to DM 0999
DM 1022 to DM 1023
(1,002 words)
Error log DM 1000 to DM 1021
(22 words)
4
Read-only DM 6144 to DM 6599
(456 words)
4
PC Setup DM 6600 to DM 6655
(56 words)
308
The following memory areas can be used with the CPM1/CPM1A.
Words
IR 00000 to IR 00915
(160 bits)
IR 01000 to IR 01915
(160 bits)
IR 20000 to IR 23115
(512 bits)
SR 23200 to SR 25515
(384 bits)
TR 0 to TR 7
(8 bits)
HR 0000 to HR 1915
(320 bits)
AR 0000 to AR 1515
(256 bits)
LR 0000 to LR 1515
(256 bits)
---
---
---
---
Note 1. IR and LR bits that are not used for their allocated functions can be used as
work bits.
2. The contents of the HR area, AR area, Counter area, and read/write DM
area are backed up by a capacitor. The backup time varies with the ambient
temperature, but at 25_C, the capacitor will back up memory for 20 days. If
the power supply is off longer than the backup time, memory contents will be
cleared and AR1314 will turn ON. (This flag turns ON when data can no
longer be retained by the built-in capacitor.) Refer to 2-1-2 Characteristics in
the CPM1 and CPM1A Operation Manual for a graph showing the backup
time vs. temperature.
3. When accessing a PV, TC numbers are used as word data; when accessing
Completion Flags, they are used as bit data.
4. Data in DM 6144 to DM 6655 cannot be overwritten from the program, but
they can be changed from a Programming Device.
Bits
These bits are allocated to the external I/O
terminals. e a s
Work bits can be freely used within the pro-
gram.
These bits serve specific functions such as
flags and control bits.
These bits are used to temporarily store
ON/OFF status at program branches.
These bits store data and retain their ON/
OFF status when power is turned off, or op-
eration starts or stops. They are used in the
same way as work bits.
These bits serve specific functions such as
flags and control bits.
Used for a 1:1 PC Link with another PC.
3
Timers and counters use the TIM,
TIMH(15), CNT and CNTR(12) instructions.
The same numbers are used for both timers
and counters.
DM area data can be accessed in word
units only. Word values are retained when
the power is turned off, or operation started
or stopped.
Read/write areas can be read and written
freely within the program.
Used to store the time of occurrence and
error code of errors that occur. These words
can be used as ordinary read/write DM
when the error log function is not being
used.
Cannot be overwritten from program.
Used to store various parameters that con-
trol PC operation.
Section 5-1
Function