Power Electronics SD300146, Руководство по аппаратному обеспечению и установке, Страница: 50 / 65

SD300 SERIES
POWER ELECTRONICS
48
MODBUS COMMUNICATION
The purpose of the Serial Communication Network of the SD300 is to integrate the drive into a
network compatible with the Modbus communications protocol. This is possible using the RS485
physical communications port or USB port.
Modbus communication system allows SD300 drives to be controlled and/or monitored as a slave
by a Modbus master from a remote location.
RS485 network allows connecting up to 16 equipments in the same network.
SD300 drives operate as a peripheral slave when connected to Modbus system. This means that
the drive does not start the communication task, the master does.
Practically all of the operating modes, parameters and drive characteristics are accessible through
serial communications. For example, master can give start and stop order to the drive, control
SD300 status, read the current used by the motor etc., in short, the master can access all of the
features of the drive.
Communication Standards
Item Standard
Communication method/
Transmission type
RS-485/Bus type, Multi-drop Link System
Number of connected inverters/
Transmission distance
Maximum of 16 inverters / Maximum1,200m (recommended distance: within 700m)
Recommended cable size 0.75mm², (18AWG), Shielded Type Twisted-Pair (STP) Wire
Installation type Dedicated terminals (S+/S-/SG) on the control terminal block
Power supply Supplied by the inverter - insulated power source from the inverter internal circuit
Communication speed 1,200/2,400/9,600/19,200/38,400/57,600/115,200 bps
Control procedure Asynchronous communications system
Communication system Half duplex system
Character system Modbus-RTU: Binary
Stop bit length 1-bit/2-bit
Frame error check 2 bytes
Parity check None/Even/Odd
Terminals
S-

RS485 A (negative)
S+

RS485 B (positive)
SG

RS Common (0VDC)
Output signal level '1' logical = +5V differential
'0' logical = -5V differential
Input signal level '1' logical = +5V differential
'0' logical = -5V differential
Programmable inputs via
Modbus 7 digital inputs in IP20 drives and 5 digital inputs in IP66 drives
2 programmable analogue inputs (0~10V / 4~20mA)
Programmable outputs via
Modbus 3 relay outputs
2 programmable analogue outputs (0~10 V / 0~32 mA)