Eaton Electrical PROFIBUS-DP EZ204-DP - Manual (Page 113)

Read/write image data
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Reading and writing local analog output QA1
The commands provided can be used to access the local
analog output of the EZ800 or EZD basic unit. When writing to
the analog output, however, the value will only be output
externally if the device concerned is in Run mode and the
image concerned has not been overwritten by actual program.
J Section “Read/write image data” on Page 99.
Example
The analog output is to output a value of approx. 5 V.
500 = 01F4
hex
Byte 5 – Data 1 (LowByte) : F4
hex
Byte 6 – Data 2 (HighByte): 01
hex
Byte Meaning Value (hex), sent by
Master Slave
0 Toggle byte J page 94
1 Command
Read 91 –
Write B1 –
Response
Read successful – C2
Write successful – C1
Command
rejected
– C0
2 Len 02 02
3 Type 05 05
4 Index 00 00
5 – 6 Data 1 – 2
Read operation 00 See example
For write
operation
See example 00
7 – 8 Data 3 – 4 00 00