HNC Electric SV-E3 Series, Инструкция по эксплуатации, Страница: 176 / 178

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6. Method of obtaining absolute data
The upper controller device can get the absolute data from the drive by RS-485 communication.
[6.1 Wiring for RS-485 communication]
Refer to
「
4. 4 RS-485 communication
」
for RS-485 communication wiring.
[6.2 About the communication between the upper controller and servo drive]
The upper controller device send communication command GET_STATE_VALUE_4 to read the encoder data by RS-485
communication. This communication command read the state value in 4 bytes.
STEP1) GET_STATE_VALUE_4 Send command
STEP2) G ET_STATE_VALUE_4 Answer the response data to the command from the drive
[6.3 Communication command description]
The absolute data are recorded by “Encoder/ rotor mechanical angle (integrate)”. The upper controller device get the
“Encoder/ rotor mechanical angle (integrate)”, that is the absolute data, from the communication data GET_STATE_VALUE_4.
The sending and receiving method are shown in the following data example. Take the communication address (target address)
“01” as the example.
1. Execute the communication command GET_STATE_VALUE_4. The command code for GET_STATE_VALUE_4 is “11”.
2. The “Encoder/ rotor mechanical angle (integrate)” is used as the transmission data to input. The state variable code for
“Encoder/ rotor mechanical angle (integrate)” is “00C3”.
Sending data Example: Encoder / rotor mechanical angle (integrate)
3. Receives data with the specified state number.
Example of data reception