90
RS-422/485 Communications Unit
Chapter 7-1
Using a SI-485/J7 (3G3JV-PSI485J) RS-422/485 Communications Unit allows
J7AZ Inverters to participate in RS-422/485 serial communications. This
makes Inverter control input, frequency reference input, monitoring of the
Inverter’s operating status, and reading and writing of parameter settings all
possible via communications. Up to 32 Inverters can be connected to the Unit
to enable easy creation of networks.
Note
1.
The RS-422/485 communications used by J7AZ Inverters conforms to the
MODBUS (a trademark of AEG Schneider Automation) communica-tions
protocol. No other communications protocol can be used in the same
network and only Inverters and related products can be used as Slaves.
2.
The communications processing time with RS-422/485 communications
for J7AZ Inverters is proportional to the number of Slaves. When
performing Inverter control, consider the communications processing time,
and restrict the number of Inverters connected according to the response
times required.
3.
The communications timeout time with RS-422/485 communications is
fixed at 2 s (when communications timeouts are enabled). In the worst
case, problems with the communications line may not be detected for up
to 2 s. Design the application and overall system to ensure safety allowing
for this.
7-1
RS-422/485 Communications Unit
7-1-1
Overview
• The SI-485/J7 (3G3JV-PSI485J) RS-422/485 Communications Unit is an
Optional Unit for J7AZ Inverters.
• Mounting an RS-422/485 Communications Unit to a 3G3JV Inverter
provides the Inverter with an RS-422/485 interface.
7-1-2
External Dimensions
21.5
16
12
4 x 3.8 = 15.2
13
2
9
63
8
19
8
Содержание J7 series
Страница 12: ...XII...
Страница 15: ...1 CHAPTER 1 Overview 1 1 Function 2 1 2 Nomenclature 3...
Страница 47: ...33 CHAPTER 3 Preparing for Operation and Monitoring 3 1 Nomenclature 34 3 2 Outline of Operation 35...
Страница 54: ...40 Outline of Operation Chapter 3 2...
Страница 102: ...88 Other Functions Chapter 6 7...
Страница 158: ...144 Option Specifications Chapter 9 3...
Страница 159: ...145 CHAPTER 10 List of Parameters List of Parameters 146...
Страница 172: ...158 List of Parameters Chapter 10...
Страница 173: ...159 CHAPTER 11 Using the Inverter for a Motor Using the Inverter for a Motor 160...