Rs-422/485 Communications Unit; Overview; External Dimensions - Omron SYSDRIVE 3G3JV User Manual

Communications
Using a 3G3JV-PSI485J RS-422/485 Communications Unit allows 3G3JV Inverters to
participate in RS-422/485 serial communications. This makes Inverter control input, fre-
quency 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 3G3JV Inverters conforms to the
MODBUS (a trademark of AEG Schneider Automation) communications pro-
tocol. No other communications protocol can be used in the same network and
only Inverters and related products can be used as Slaves.
Note 2. The communications processing time with RS-422/485 communications for
3G3JV 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.
Note 3. The communications timeout time with RS-422/485 communications is fixed
at 2 s (when communications timeouts are enabled). In the worst case, prob-
lems 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 3G3JV-PSI485J RS-422/485 Communications Unit is an Optional Unit for 3G3JV 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

7-2
Chapter 7