86
Overview
Section 6-1
6-1
Overview
6-1-1
I/O Memory Areas
Data area
Word addresses
Bit addresses
Size
Function
Input Area
IR 000
IR 00000 to IR 00011
12 bits
Bits in the Input Area are allocated to input
terminals. These allocations are fixed and
cannot be changed.
IR 00000 to IR 00003 can be used either
as normal inputs or as interrupt inputs.
Interrupt inputs are used in Input Interrupt
Mode or Counter Mode.
Output Area
IR 001
IR 00100 to IR 00107
8 bits
Bits in the Output Area are allocated to
output terminals. These allocations are
fixed and cannot be changed.
IR 00108 to IR 00115 can also be used as
work bits in programming.
Work Area
IR 002 to IR 049
IR 00200 to IR 04915
1,088 bits Work bits do not have any specific func-
tion, and they can be freely used within the
program.
IR 200 to IR 219
IR 20000 to IR 21915
SR Area
SR 220 to SR 255
SR 22000 to SR 25507
568 bits
These bits serve specific functions such
as flags and control bits.
SR 230 to SR 239 are used to exchange
general-purpose data with the memory in
the CPU Unit’s CIO Area allocated to the
Customizable Counter Unit.
AR Area
AR 00 to AR 27
AR 0000 to AR 2715
448 bits
These bits serve specific functions such
as flags and control bits.
TR Area
---
TR 0 to TR 7
8 bits
These bits are used to temporarily store
ON/OFF status at program branches.
LR Area
LR 00 to LR 31
LR 0000 to LR 3115
256 bits
These bits are used to exchange general-
purpose data with the CPU Unit. Cyclic
data transfers can be set up with user-set
words in the CPU Unit.
Up to 32 I/O words of data can be
exchanged. The LR Area allocations are
set in DM 6601 to DM 6604 of the Unit
Setup Area in the Customizable Counter
Unit.
Timer/Counter
Area
TIM/CNT 000 to TIM/CNT 255
(timer/counter numbers)
256 bits
The timer numbers in the Timer/Counter
Area are allocated to create timers and
counters. The same numbers are used for
both timers and counters.
Read/Write
portion of DM
Area
DM 0000 to DM 6143 (Designation not possi-
ble in bit units.)
6,144
words
DM Area data can be read and written
using instructions or the Programming
Device in word units only. Word values are
retained when power is turned OFF or
when the operating mode is switched.
The contents of the DM Area can be
backed up in flash memory by turning ON
a control bit (SR 25200). Data can be read
from flash memory using XFER(70).
EM Area
EM 0000 to EM 2047
(Designation not possi-
ble in bit units.)
2,048
words
EM area data can be read and written
using instructions or the Programming
Device in word units only.
It is possible to set whether or not word
values are retained when power is turned
OFF or when the operating mode is
switched.
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