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SIEPCYEUOQ2V01A Q2V Technical Manual
6.3
Modbus Communications
This section gives detailed information about the parameters, error codes and communication procedures for
Modbus communications.
◆
Configure Master/Slave
You can use the Modbus protocol for serial communication with programmable controllers (PLC).
The Modbus communication uses one master (PLC) and a maximum of 31 slave drives. Serial communications
usually starts with a signal from the master to the slave drives.
A slave drive that receives a command from the master does the specified function and then sends a response back
to the master. You must set the address number for each slave drive before you start signal communications to
make sure that the master uses the correct address numbers.
A - Master (PLC)
B - Slave (drive)
Figure 6.1 PLC and Drive Connection Example
◆
Communication Specifications
Table 6.2 Modbus Specifications
Item
Specification
Interface
RS-485
Synchronization method
Asynchronous (start-stop synchronization)
Communication parameter
Communications speed:1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, 76.8, 115.2 kbps
Data length: 8 bit (fixed)
Parity: even, odd, none
Stop bit 1 bit (fixed)
Communication protocol
Modbus standard (RTU mode only)
Number of possible units to connect
Maximum: 31 units
◆
Communication with the PLC
This section gives information about the settings for the termination resistor and how to connect to Modbus
communications. Modbus communications uses an RS-485 interface (2-wire sequence).
■
Connect Communications Cable
Use this procedure to start communication between the PLC and drive.
Summary of Contents for Q2V Series
Page 2: ...This Page Intentionally Blank 2 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 12: ...12 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 18: ...i 2 Legal Information 18 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 26: ...1 2 Features and Advantages of Control Methods 26 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 38: ...2 8 Installation Methods 38 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 70: ...3 3 Main Circuit Wiring 70 SIEPCYEUOQ2V01A Q2V Technical Manual Models B006 B012...
Page 102: ...3 17 Motor Application Precautions 102 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 138: ...4 12 Test Run Checklist 138 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 144: ...5 2 European Standards 144 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 145: ...Standards Compliance 5 5 2 European Standards SIEPCYEUOQ2V01A Q2V Technical Manual 145...
Page 146: ...5 2 European Standards 146 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 266: ...7 10 Troubleshooting Without Fault Display 266 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 284: ...8 6 Storage Guidelines 284 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 312: ...10 10 Peripheral Devices and Options 312 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 430: ...11 21 Parameters Changed by PM Motor Code Selection 430 SIEPCYEUOQ2V01A Q2V Technical Manual...
Page 731: ...SIEPCYEUOQ2V01A Q2V Technical Manual 731 Z Z pulse Auto Tuning 125...