Rockwell Automation 1760-DNET Pico DeviceNet Communications Module User Manual User Manual
Page 54
Publication 1760-UM003A-EN-P - September 2005
6-10 Application Examples for Pico
Example:
A voltage signal is present at analog input 1. The required telegrams
for reading the analog value are as follows:
Byte 4 – Data 1 (Low Byte): 4B
hex
Byte 5 – Data 2 (High Byte): 03
hex
l corresponding 16-bit value: 034B
hex
= 843
The value 843 corresponds to the 10 bit value of the analog converter.
The following conversion is required for the actual analog value:
Write marker: M1 – M16/N1 – N16
Table 6.16 Example Telegram for Reading the Value at the Analog Input
Byte
Meaning
Value (hex), sent by
Master
Slave
Master
Slave
Attribute ID: Read
88
–
0
Response: read successful
–
C2
0
1
Len
02
02
1
2
Type
8C
8C
2
3
Index
02
(1)
(1) 02 = Analog input I11
3
4
Data 1
00
4B
4
5
Data 2
00
03
5
6
Data 3
00
00
6
7
Data 4
00
00
Table 6.17 Telegram Structure
Byte
Meaning
Value (hex), sent by
Master
Slave
Master
Slave
Attribute ID: Write
8C
–
0
Response:
Write successful
–
C1
10V
1023
------------
10bit
×
10V
1023
------------
843
×
8.24V
=