CM3 AD Module Buffer Memory (SP08EAO)

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-SP08EAO Analog Buffer Memory

CM3-SP08EAO 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 5 Digital conversion value	-	✓	-
05H	5	Channel 6 Digital conversion value	-	✓	-
06H	6	Channel 7 Digital conversion value	-	✓	-
07H	7	Channel 8 Digital conversion value	-	✓	-
08H	8	Channel 1 Precise value	-	✓	-	Precise value
09H	9	Channel 2 Precise value	-	✓	-
0AH	10	Channel 3 Precise value	-	✓	-
0BH	11	Channel 4 Precise value	-	✓	-
0CH	12	Channel 5 Precise value	-	✓	-
0DH	13	Channel 6 Precise value	-	✓	-
0EH	14	Channel 7 Precise value	-	✓	-
0FH	15	Channel 8 Precise value	-	✓	-
10H	16	Channel 1 Percentile value	-	✓	-	Percentile Value
11H	17	Channel 2 Percentile value	-	✓	-
12H	18	Channel 3 Percentile value	-	✓	-
13H	19	Channel 4 Percentile value	-	✓	-
14H	20	Channel 5 Percentile value	-	✓	-
15H	21	Channel 6 Percentile value	-	✓	-
16H	22	Channel 7 Percentile value	-	✓	-
17H	23	Channel 8 Percentile value	-	✓	-
18H	24	Channel 1 Setup input signal range	0	✓	✓	Setup input signal range
19H	25	Channel 2 Setup input signal range	0	✓	✓
1AH	26	Channel 3 Setup input signal range	0	✓	✓
1BH	27	Channel 4 Setup input signal range	0	✓	✓
1CH	28	Channel 5 Setup input signal range	0	✓	✓
1DH	29	Channel 6 Setup input signal range	0	✓	✓
1EH	30	Channel 7 Setup input signal range	0	✓	✓
1FH	31	Channel 8 Setup input signal range	0	✓	✓
20H	32	Setup Raw Value digital output	0	✓	✓	Setup raw value digital output
21H	33	Reserved	-	-	-
22H	34	Channel 1 Average processing setting value	2000h	✓	✓	Average processing setting value
23H	35	Channel 2 Average processing setting value	2000h	✓	✓
24H	36	Channel 3 Average processing setting value	2000h	✓	✓
25H	37	Channel 4 Average processing setting value	2000h	✓	✓
26H	38	Channel 5 Average processing setting value	2000h	✓	✓
27H	39	Channel 6 Average processing setting value	2000h	✓	✓
28H	40	Channel 7 Average processing setting value	2000h	✓	✓
29H	41	Channel 8 Average processing setting value	2000h	✓	✓
2AH	42	Channel 1 Maximum alarm setting value	0	✓	✓	Maximum alarm setting value
2BH	43	Channel 2 Maximum alarm setting value	0	✓	✓
2CH	44	Channel 3 Maximum alarm setting value	0	✓	✓
2DH	45	Channel 4 Maximum alarm setting value	0	✓	✓
2EH	46	Channel 5 Maximum alarm setting value	0	✓	✓
2FH	47	Channel 6 Maximum alarm setting value	0	✓	✓
30H	48	Channel 7 Maximum alarm setting value	0	✓	✓
31H	49	Channel 8 Maximum alarm setting value	0	✓	✓
32H	50	Channel 1 Minimum alarm setting value	0	✓	✓	Minimum alarm setting value
33H	51	Channel 2 Minimum alarm setting value	0	✓	✓
34H	52	Channel 3 Minimum alarm setting value	0	✓	✓
35H	53	Channel 4 Minimum alarm setting value	0	✓	✓
36H	54	Channel 5 Minimum alarm setting value	0	✓	✓
37H	55	Channel 6 Minimum alarm setting value	0	✓	✓
38H	56	Channel 7 Minimum alarm setting value	0	✓	✓
39H	57	Channel 8 Minimum alarm setting value	0	✓	✓
3AH	58	Maximum alarm status	-	✓	-	Maximum alarm status
3BH	59	Minimum alarm status	-	✓	-	Minimum alarm status
3CH	60	Channel 1 Digital filter constant	30	✓	✓
3DH	61	Channel 2 Digital filter constant	30	✓	✓
3EH	62	Channel 3 Digital filter constant	30	✓	✓
3FH	63	Channel 4 Digital filter constant	30	✓	✓
40H	64	Channel 5 Digital filter constant	30	✓	✓
41H	65	Channel 6 Digital filter constant	30	✓	✓
42H	66	Channel 7 Digital filter constant	30	✓	✓
43H	67	Channel 8 Digital filter constant	30	✓	✓
44H	68	14/16 Bit Set	-	✓	✓
45H	69	Error Code	-	✓	-	Error Code
46H	70	Operating System Version	-	✓	-	OS Version
47H	71	Reserved	-	-	-
48H	72		-	-	-
49H	73		-	-	-
4AH	74		-	-	-
4BH	75		-	-	-
4CH	76		-	-	-
4DH	77		-	-	-
4EH	78		-	-	-
4FH	79	Check AD channel use	0	✓	✓
50H	80	Reserved	-	-	-
51H	81		-	-	-
52H	82	Channel 1 Digital conversion value (16-Bit)	-	✓	✓
53H	83	Channel 2 Digital conversion value (16-Bit)	-	✓	✓
54H	84	Channel 3 Digital conversion value (16-Bit)	-	✓	✓
55H	85	Channel 4 Digital conversion value (16-Bit)	-	✓	✓
56H	86	Channel 5 Digital conversion value (16-Bit)	-	✓	✓
57H	87	Channel 6 Digital conversion value (16-Bit)	-	✓	✓
58H	88	Channel 7 Digital conversion value (16-Bit)	-	✓	✓
59H	89	Channel 8 Digital conversion value (16-Bit)	-	✓	✓

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% ~ 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	Channel 8	Channel 7	Channel 6	Channel 5	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	Channel 8	Channel 7	Channel 6	Channel 5	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.