Rockwell-automation 1760-DNET Pico DeviceNet Communications Module Use Bedienungsanleitung PDF herunterladen (Seite 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

(1)

(1) 02 = Analog input I11

(1)

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=

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 167 168

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