Eaton Electrical PROFIBUS-DP EZ204-DP - Manual (Page 107)

Read/write image data
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Read local analog inputs IA1 to IA4
The analog inputs on the EZ800 and EZD basic units can be
read directly via PROFIBUS-DP. The 16-bit value is
transferred in Intel format (LowByte first).
Telegram structure
Byte Meaning Value (hex), sent by
Master Slave
0 Toggle byte J page 94
1 Command: Read 91 –
Response:
Read successful – C2
Command
rejected
– C0
2 Len 02 02
3 Type 02 02
4 Index 01 – 04 1 01 – 04 1
5 Data 1 (Low Byte) 00 See example
6 Data 2 (High Byte) 00 See example
7 – 8 Data 3 – 4 00 00
1) 01 = Analog input I7
02 = Analog input I8
03 = Analog input I11
04 = Analog input I12