Appendix C
Memory Areas
572
Word(s)
Page
Read/
write
Function
Bit(s)
SR 255
00
0.1-second clock pulse (0.05 second ON; 0.05 second OFF)
Read-
l
---
01
0.2-second clock pulse (0.1 second ON; 0.1 second OFF)
only
---
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)
Function
Page
AR 00,
AR 01
00 to 15
Not used.
AR 02
00
Expansion Unit Error Flag for 1st Unit
These flags turn ON
h
h
i
i
---
01
Expansion Unit Error Flag for 2nd Unit
(Not used by CPM1 CPU Units without “-V1” suffix.)
g
when there is an error in
the corresponding Unit.
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
AR 07
00 to 15
Not used.
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
273
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.
---
Содержание SRM1 - PROGRAMING 02-2001
Страница 1: ...Programmable Controllers Cat No W353 E1 06 SYSMAC CPM1 CPM1A CPM2A CPM2C SRM1 V2 PROGRAMMING MANUAL ...
Страница 2: ...CPM1 CPM1A CPM2A CPM2C SRM1 V2 Programmable Controllers Programming Manual Revised February 2008 ...
Страница 3: ...iv ...
Страница 5: ...vi ...
Страница 9: ...x ...
Страница 15: ...xvi ...