Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 587

Memory Areas
Word(s) Bit(s)
SR 255 00 0.1-second clock pulse (0.05 second ON; 0.05 second OFF)
01 0.2-second clock pulse (0.1 second ON; 0.1 second OFF)
02 1.0-second clock pulse (0.5 second ON; 0.5 second OFF)
03 Instruction Execution Error (ER) Flag
Turns ON when an error occurs during execution of an instruction.
04 Carry (CY) Flag
Turns ON when there is a carry in the results of an instruction execution.
05 Greater Than (GR) Flag
Turns ON when the result of a comparison operation is "greater."
06 Equals (EQ) Flag
Turns ON when the result of a comparison operation is "equal," or when the
result of an instruction execution is 0.
07 Less Than (LE) Flag
Turns ON when the result of a comparison operation is "less."
08 to 15 Not used.
Note DM 6601 in the PC Setup can be set to maintain the previous status of the I/O Hold Bit (SR 25212) and the
I/O Hold Bit (SR 25212) when power is turned OFF. If power is left OFF for longer than the backup time,
however, status may be cleared. For details regarding the backup time, refer to the CPM1A or CPM1
Operation Manual. Refer to 1-1-2 CPM1/CPM1A PC Setup Settings for details on the PC Setup.
AR Area
These bits mainly serve as flags related to CPM1/CPM1A operation. These bits retain their status even after the
CPM1/CPM1A power supply has been turned off or when operation begins or stops.
Word(s) Bit(s)
AR 00, 00 to 15 Not used.
AR 01
AR 02
00 Expansion Unit Error Flag for 1st Unit
01 Expansion Unit Error Flag for 2nd Unit
(Not used by CPM1 CPU Units without "-V1" suffix.)
02 Expansion Unit Error Flag for 3rd Unit
(Not used by CPM1 CPU Units without "-V1" suffix.)
03 to 07 Not used.
08 to 11 Number of I/O Units Connected
12 to 15 Not used.
AR 03 to 00 to 15 Not used.
AR 07
AR 08
00 to 07 Not used.
08 to 11 Programming Device Error Code
0: Normal completion
1: Parity error
2: Frame error
3: Overrun error
12 Programming Device Error Flag
13 to 15 Not used.
AR 09 00 to 15 Not used.
AR 10 00 to 15 Power-off Counter (4 digits BCD)
This is the count of the number of times that the power has been turned off.
To clear the count, write "0000" from a Programming Device.
572
Function
Function
Appendix C
Read/
write
Read-
only l
These flags turn ON g
when there is an error in h h i i
the corresponding Unit.
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