Omron SYSMAC mini SP10, Operation Manual, Page: 36 / 176

28
Area Function Bit
addresses
Word
addresses
No. of
bits
PC
Work bits SP10 36 00 0008 to 0015 These bits are used within the program to aid
programming.
01 0104 to 0115
02 0200 to 0215
SP16 208 00 0010 to 0015
01 0106 to 0115
02 0200 to 0215
10 to 20 1000 to 2015
SP20 204 00 0012 to 0015
01 0108 to 0115
02 0200 to 0215
10 to 20 1000 to 2015
Dedicated bits SP10 20 03 0300 to 0315 These bits are assigned specific functions.
04 0408 to 0411 For details, refer to the table in 3-2-4 Dedicated Bits.
SP16, 69 03 0300 to 0315
SP20 04 0408 to 0411
05 0515
07 0700 to 0715
08 0800 to 0815
09 0900 to 0915
Data Retention
(DR) All 256
max. DR 00 to
DR 15 DR 0000 to
DR 1515 These bits retain their ON/OFF state even during power
interruptions. The number of DR bits decreases if more
link bits are designated.
Link Relay
(LR) All 128
max. LR 00 to
LR 07 LR 0000 to
LR 0715 Used to exchange data with other SP-series PCs
through a Link Adapter. To access the LR area, the LR
area must be defined via the Programming Console.
Timer/Counter
(TC) All 16 TIM/CNT 00 to 15 Used to define timers and counters and to access
Completion Flags, PV, and SV for them. TC 14 is used
by the HIGH-SPEED TIMER instruction (TIMH), and TC
15 is used by the ANALOG TIMER instruction.
3-2-1 Data Area Structure
When designating a data area, the acronym for the area is always required
for the DR, TC, and LR areas.
An actual data within any data area but the TC area is designated by its ad-
dress. The address designates the bit or word within the area where the de-
sired data is located. The TC area consists of TC numbers, each of which is
used for a specific timer or counter defined in the program. Refer to 3-2-7 TC
(Timer/Counter) Area for more details on TC numbers.
The rest of the data area consists of words, each of which consists of 16 bits
numbered 00 through 15 from right to left. words 000 and 001 are shown be-
low with bit numbers. Here, the content of each word is shown as all zeros.
Bit 00 is called the rightmost bit; bit 15, the leftmost bit.
The term least significant bit is often used for rightmost bit; the term most
significant bit, for leftmost bit. These terms are not used in this manual be-
cause a single data word is often split into two or more parts, with each part
used for different parameters or operands. When this is done, the rightmost
bits of a word may actually become the most significant bits, i.e., the leftmost
bits in another word, when combined with other bits to form a new word.
Memory Areas
Section 3-2