CM3 AD Module Buffer Memory (SP04EAO)

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-SP04EAO Buffer Memory

CM3-SP04EAO Buffer Memory
Memory Address		Details	Default	Read	Write	Link
Hexadecimal	Decimal
00H	0	Channel 1 Digital conversion value	-	✓	-	Digital conversion value
01H	1	Channel 2 Digital conversion value	-	✓	-
02H	2	Channel 3 Digital conversion value	-	✓	-
03H	3	Channel 4 Digital conversion value	-	✓	-
04H	4	Channel 1 Precise value	-	✓	-	Precise value
05H	5	Channel 2 Precise value	-	✓	-
06H	6	Channel 3 Precise value	-	✓	-
07H	7	Channel 4 Precise value	-	✓	-
08H	8	Channel 1 Percentile value	-	✓	-	Percentile Value
09H	9	Channel 2 Percentile value	-	✓	-
0AH	10	Channel 3 Percentile value	-	✓	-
0BH	11	Channel 4 Percentile value	-	✓	-
0CH	12	Channel 1 Setup input signal range	0	✓	✓	Setup input signal range
0DH	13	Channel 2 Setup input signal range	0	✓	✓
0EH	14	Channel 3 Setup input signal range	0	✓	✓
0FH	15	Channel 4 Setup input signal range	0	✓	✓
10H	16	Setup Raw Value digital output	0	✓	✓	Setup raw value digital output
11H	17	Reserved	-	-	-
12H	18	Channel 1 Average processing setting value	2000h	✓	✓	Average processing setting value
13H	19	Channel 2 Average processing setting value	2000h	✓	✓
14H	20	Channel 3 Average processing setting value	2000h	✓	✓
15H	21	Channel 4 Average processing setting value	2000h	✓	✓
16H	22	Channel 1 Maximum alarm setting value	0	✓	✓	Maximum alarm setting value
17H	23	Channel 2 Maximum alarm setting value	0	✓	✓
18H	24	Channel 3 Maximum alarm setting value	0	✓	✓
19H	25	Channel 4 Maximum alarm setting value	0	✓	✓
1AH	26	Channel 1 Minimum alarm setting value	0	✓	✓	Minimum alarm setting value
1BH	27	Channel 2 Minimum alarm setting value	0	✓	✓
1CH	28	Channel 3 Minimum alarm setting value	0	✓	✓
1DH	29	Channel 4 Minimum alarm setting value	0	✓	✓
1EH	30	Maximum alarm status	-	✓	-	Maximum alarm status
1FH	31	Minimum alarm status	-	✓	-	Minimum alarm status
20H	32	Channel 1 Digital filter constant	30	✓	✓
21H	33	Channel 2 Digital filter constant	30	✓	✓
22H	34	Channel 3 Digital filter constant	30	✓	✓
23H	35	Channel 4 Digital filter constant	30	✓	✓
24H	36	Calibration code	-	✓	✓
25H	37	Error Code	-	✓	-	Error Code
26H	38	Operating System Version	-	✓	-	OS Version

Digital Conversion Value

• The digital conversion value is used to save A/D conversion of a digital output value.
• The digital conversion value indicates 0 ~ 64,000 (unsigned) or -32,000 ~ 32,000 (signed) by 16-bit (WORD).
  • If the digital conversion value is over this range, its value is fixed with -384/64,383 (unsigned) or -32,384/32,384 (signed).

Precise Value

• The precise value is used to convert A/D conversion values to precise values.
• Refer to the table below for the analog input range with its precise value.

Precise Value
Analog Input	Precise Value
4mA ~ 20mA	4,000 ~ 20,000
0mA ~ 20mA	0 ~ 20,000
+1V ~ +5V	1,000 ~ 5,000
0V ~ +5V	0 ~ 5,000
-10V ~ +10V	-10,000 ~ 10,000
0V ~ +10V	0 ~ 10,000

Percentile Value

• The percentile value is used to save an analog input value for each channel as a percentile value compared with input signal range.
• The conversion value is 0 ~ 10,000
  • 0.00% ~ 100.00%

Setup Input Signal Range

• The setup input signal range is used to setup the analog input range for each channel.
• Refer to the table below for the setup input signal ranges.

Signal Ranges
Input Signal Range	Setting Value
4mA ~ 20mA	0
0mA ~ 20mA	1
+1 ~ +5V	2
0V ~ +5V	3
-10V ~ +10V	4
0V ~ +10V	5

Setup Raw Value Digital Output

• Setup range of the digital conversion value to output raw value.
  • Two bits for each channel are assigned.
    • Refer to the table below for bit mapping.

Bit Mapping
Most Significant Bits								Least Significant Bits
0	0	0	0	0	0	0	0	Channel 4		Channel 3		Channel 2		Channel 1

Conversion Input & Full Value Range
Code	Normal Input Range	Full Range
00 (0)	-8,000 ~ 8,000	-8,191 ~ 8,192
01 (1)	-8,000 ~ 8,000	-8,000 ~ 8,000
10 (2)	-192 ~ 16,191	-192 ~ 16,191
11 (3)	0 ~ 64,000	0 ~ 64,000

Full range is used when exceeding the normal input range.

Average Processing Setting Value

• The average processing setting value is used to specify average processing methods.
  • Count average:
    • Upper 1 byte
    • 1 ~ 256
  • Time average:
    • Lower 1 byte
    • 0 ~ 256 (10ms)

Maximum Alarm Setting Value

• The maximum alarm setting value sets the maximum value for the alarm.
  • The alarm occurs when the A/D conversion value exceeds the maximum alarm setting value.

Minimum Alarm Setting Value

• The minimum alarm setting value sets the minimum value for the alarm.
  • The alarm occurs when the A/D conversion value is less than the minimum alarm setting value.

Maximum Alarm Status

• If the A/D conversion value exceeds the maximum alarm setting value, the related channel's bit is ON (1).

Maximum Alarm Status Bit Mapping
0	0	0	0	0	0	0	0	0	0	0	0	Channel 4	Channel 3	Channel 2	Channel 1

Minimum Alarm Status

• If the A/D conversion value is less than the minimum alarm setting value, the related channel's bit is ON (1).

Minimum Alarm Status Bit Mapping
0	0	0	0	0	0	0	0	0	0	0	0	Channel 4	Channel 3	Channel 2	Channel 1

Error Code

Error Codes
Error Code	Description
0	No Error
1	System Error A/S needed
2	Calibration fault for A/D conversion value

Operating System Version

• The operating system version indicates the firmware version of the module.