CM3 High-Speed Counter Module Buffer Memory

To write to buffer memory, use the TO instruction.

To read from buffer memory, use the FROM instruction.

Please refer to the table below for writing to and reading from buffer memory.

CM3-SP02HSC & CM3-SP02HSD Buffer Memory

CM3-SP02HSC & CM3-SP02HSD Buffer Memory
Memory Address				Details	Low Active	High Active	Initial Value	Read Write
Ch. 1		Ch. 2
Hex.	Dec.	Hex.	Dec.
00H	0	20H	32	Currently Counted Value	✓	-	0	R
01H	1	21H	33		-	✓
02H	2	22H	34	Overflow Detected Flag	-	-	0	R
03H	3	23H	35	Sampling-Counted or Periodic Pulse-Counted Flag	-	-	0	R
04H	4	24H	36	Latch-Counted Value	✓	-	0	R
05H	5	25H	37		-	✓
06H	6	26H	38	Sampling-Counted Value	✓	-	0	R
07H	7	27H	39		-	✓
08H	8	28H	40	Previous Periodic Pulse-Counted Values	✓	-	0	R
09H	9	29H	41		-	✓
0AH	10	2AH	42	Current Periodic Pulse-Counted Values	✓	-	0	R
0BH	11	2BH	43		-	✓
0CH	12	2CH	44	Reserved	-	-	-	-
0DH	13	2DH	45		-	-	-	-
0EH	14	2EH	46		-	-	-	-
0FH	15	2FH	47		-	-	-	-
10H	16	30H	48	Preset Value	✓	-	0	R/W
11H	17	31H	49		-	✓
12H	18	32H	50	Set Coincidence Comparison value 1	✓	-	0	R/W
13H	19	33H	51		-	✓
14H	20	34H	52	Set Coincidence Comparison Value 2	✓	-	0	R/W
15H	21	35H	53		-	✓
16H	22	36H	54	Set Lowest Limit Value of Ring Counting	✓	-	0	R/W
17H	23	37H	55		-	✓
18H	24	38H	56	Set Upper Limit Value of Ring Counting	✓	-	0	R/W
19H	25	39H	57		-	✓
1AH	26	3AH	58	Counting Function Setup	-	-	0	R/W
1BH	27	3BH	59	Sampling/Periodic Time	-	-	0	R/W
1CH	28	3CH	60	Counting Mode	-	-	0	R/W
1DH	29	3DH	61	Pulse Input Method	-	-	7	R/W
1EH	30	3EH	62	Counting Down by Software	-	-	0	R/W

Currently Counted Value

• This is used to store the currently counted values.
• The counting range is -2,147,483,648 ~ 2,147,483,647 (2³²).

Overflow Detected Flag

• Overflow may occur when using linear counting:

Status	Buffer Memory Value
No overflow	0
Overflow occurs	1

Sampling-Counted or Periodic Pulse-Counted Flag

• This is used to store the counting status when sampling counting or periodic pulse counting is selected.

Sampling-Counted or Periodic Pulse-Counted Flag
Buffer Memory Data	Status
0	Stop counting
1	Counting

Latch-Counted Value

• The latch-counted value is used when the CM3-SP02HSC and CM3-SP02HSD modules latch count.
  • This will store the latch-counted value.
• The range for latch counting is -2,147,483,648 ~ 2,147,483,647 (2³²).

Sampling-Counted Value

• The sampling-counted value is used when the CM3-SP02HSC and CM3-SP02HSD modules sampling count.
  • This will store the sampling-counted value.
• The range for sampling counting is -2,147,483,648 ~ 2,147,483,647 (2³²).

Previous & Current Periodic Pulse-Counted Values

• When the CM3-SP02HSC and CM3-SP02HSD modules periodic pulse count, this is used to store the previous and current periodic pulse-counted values.
• The range for sampling counting is -2,147,483,648 ~ 2,147,483,647 (2³²).

Preset Value

• The preset value is used to store the preset value for counting.
• The range for sampling counting is -2,147,483,648 ~ 2,147,483,647 (2³²).
• To make the set value available, Request DPRAM (Yn.3/Yn.B), is ON or OFF.
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.

Set Coincidence Comparison Values 1 & 2

• The set coincidence comparison values 1 and 2 are used to store a set value which is compared with the current value for coincidence output.
• 2 coincidence output values can be set up by the channels.
• The range for sampling counting is -2,147,483,648 ~ 2,147,483,647 (2³²).
• To make the set value available, Request DPRAM (Yn.3/Yn.B), is ON or OFF.
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.

Set Lowest and Upper Limit Value of Ring Counting

• In case of ring counting, this is used to select the range.
• The range for sampling counting is -2,147,483,648 ~ 2,147,483,647 (2³²).
• To make the set value available, Request DPRAM (Yn.3/Yn.B), is ON or OFF.
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.

Counting Function Setup

• The counting function setup is used to set up the counting method.
• To make the set value available, Request DPRAM (Yn.3/Yn.B), is ON or OFF.
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.

Counting Function Setup
Buffer Memory Data	Status
0	Disable counting
1	Latch counting
2	Sampling counting
3	Periodic counting

Sampling/Periodic Time

• When sampling or periodic pulse counting is selected, this is used to store the value for setting up the time used.
• The range is 0 ~ 65,535.
• The unit time is 10ms.
• To make the set value available, Request DPRAM (Yn.3/Yn.B), is ON or OFF.
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.

Counting Mode

• The counting mode is used to set up whether linear or ring counting is operated.
• To make the set value available, Request DPRAM (Yn.3/Yn.B), is ON or OFF.
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.

Counting Mode
Buffer Memory Data	Counting Mode
0	Linear counting
1	Ring counting

Pulse Input Method

• The pulse input method is used to select the method to input the pulses counted.
• To make the set value available, Request DPRAM (Yn.3/Yn.B), is ON or OFF.
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.

Pulse Input Method
Buffer Memory Data	Input Method
0	1-Phase 1-Multiplication B-Phase for H/W Input
1	1-Phase 1-Multiplication B-Phase for S/W Input
2	1-Phase 2-Multiplication B-Phase for H/W Input
3	1-Phase 2-Multiplication B-Phase for S/W Input
4	Clockwise or Counter-clockwise
5	2-Phase 1-Multiplication
6	2-Phase 2-Multiplication
7	2-Phase 4-Multiplication

Counting Down by Software

• If 1 is written to the buffer memory when the CM3-SP02HSC and CM3-SP02HSD modules are counting in 1-Phase input, the modules can count down.
• To count down by software:
  • 1-Phase 1-Multiplication Phase-B software input: enter 1 into the Pulse Input Method buffer memory, 3DH (29).
  • 1-Phase 2-Multiplication Phase-B software input: enter 3 into the Pulse Input Method buffer memory, 3DH (39).
• As a set value is stored in EEPROM, the CM3-SP02HSC and CM3-SP02HSD modules are operated as previously set values even though the power is ON or OFF.