Omron C500-LDP01-V1, Operation Manual

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3-3 SR (Special Relay) Area
The following 16 bits are available for use in programming. Most of these are
flags that can be read to determine program execution status or results. Bit
1304, the Carry Flag, is also manipulated by the user with STC(40) and
CLC(41). Refer to descriptions of similar bits in the C500 Operation Manual for
details.
Bit address Description
1208 Always OFF
1209 Turns ON for scans over 100 ms
1210
1211 Always OFF
1212
1213 Always ON
1214 Always OFF
1215 Turns ON for one scan time at the beginning of operation.
1300 0.1 sec clock pulse
1301 0.2 sec clock pulse
1302 1.0 sec clock pulse
1303 Turns ON when the operational data is not BCD (ER flag).
1304 Turns ON if the operational result produces a carry (CY flag).
1305 Turns ON if the operational result is greater (GR flag).
1306 Turns ON if the operational result is equal to zero (EQ flag).
1307 Turns On if the operational result is less (LE flag).
3-4 TR (Temporary Relay) Bits
TR 0 through TR 7 can be used to store execution conditions at branches in lad-
der-diagram programs.
3-5 TC (Timer/Counter) Area
TC 00 through TC 15 can be used to define timers and counters in the program.
Each TC number can be used only once to define a timer or counter.
3-6 DM (Data Memory) Area
The DM area contains 128 words between DM 000 and DM 127 and is used for
storage of data by word. Although each word contains 16 bits, the DM area is
accessible in word units only.
Clock data is assigned to DM 60 to 63; these words cannot be used for standard
data. The clock can be set by writing data to these addresses in PROGRAM or
MONITOR mode from a Programming Device or from the program. The clock is
factory set to Sunday, January 1, year 00, 00:00:00. When power is applied, the
clock starts at this time, and will continue timing for up to 10 days even if the pow-
er is cut off.
DM 064 through DM 127 are used for data transfer when pin 2 of the back panel
DIP switch is turned ON (i.e., data transfer by the WRIT(87) and READ(88) in-
structions is enabled), and this region of the DM area cannot be used as normal
DM words.
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Section 3-6