CHAPTER 13 RS-485 COMMUNICATIONS
Modbus RTU Communications
13-33
13
13.1.5 Communications Procedures
1. Start of communications
The amplifier cannot perform communications after the power supply is turned on until the internal
initialization has been complete. When turning on the amplifier, perform the procedure below, and then
start normal communications.
1. Turn on the power supply, and wait for approximately 1.5 s.
2. Send an FC 08h (maintenance echo back) query from the master.
3. Confirm that a response message (echo back) is returned from the amplifier.
2. Communications
timings
Communications timings are as follows:
(1) Amplifier’s response time (T1)
This is the time passing after a query is sent from the master until the amplifier starts sending a
response message. When communication timeout is monitored by the master, time around T1 +
100 ms is recommended.
(2) Sending/receiving switching time (T2)
This is the time passing after a response message is sent by an amplifier until the amplifier
becomes able to receive the next query.
When the master has received a response message from the amplifier, it must wait for T2 or more
before sending the next query.
(3) Waiting time after a broadcast query is sent (T3)
This is the time passing after a broadcast query is sent by the master until the amplifier becomes
able to receive the next query. When the master has sent a broadcast query, it must wait for T3 or
more before sending the next query.
Query
T1
Response
Master :
Amplifier :
Query
T1
Response
T2
Queries with specifying an amplifier's station number
Master :
Amplifier :
Query
T3
Broadcast queries
Query
T3
Query
Содержание ALPHA5 Smart
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Страница 36: ...CHAPTER 0 INTRODUCTION 0 16 Combination between Servomotor and Servo Amplifier 0...
Страница 276: ...CHAPTER 4 PARAMETER 4 108 Output Terminal Function Setting Parameter 4...
Страница 368: ...CHAPTER 6 KEYPAD 6 56 Test Operation Mode 6...
Страница 392: ...CHAPTER 7 MAINTENANCE AND INSPECTION 7 24 Troubleshooting 7...
Страница 405: ...CHAPTER 8 SPECIFICATIONS Specifications of Servo Amplifier 8 13 8 8 2 2 Interface Specifications...
Страница 411: ...CHAPTER 8 SPECIFICATIONS Dimensions of Servo Amplifier 8 19 8 8 4 Dimensions of Servo Amplifier...
Страница 472: ...CHAPTER 11 ABSOLUTE POSITION SYSTEM 11 8 Calculation of Battery Life 11...
Страница 488: ...CHAPTER 12 POSITIONING DATA 12 16 Response Time 12...
Страница 592: ...CHAPTER 14 PC LOADER 14 48 Parameter Conversion Tool 14 1 2 3 4 6 7 8 9 10 11...
Страница 595: ...CHAPTER 15 APPENDIXES Main Circuit Block Diagram 15 3 15 15 2 Main Circuit Block Diagram Applicable model Frame1...
Страница 633: ...CHAPTER 15 APPENDIXES Product Warranty 15 41 15 15 9 Product Warranty...
Страница 634: ...CHAPTER 15 APPENDIXES 15 42 Service Network 15 15 10 Service Network...
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