Functions; Easy Communications; Communications With Cs/Cj-Series - Omron 3G3MV-PDRT2 User Manual

Functions and System Configuration
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Functions

The 3G3MV-PDRT2 DeviceNet Communications Unit is a DeviceNet communications interface Unit
for the SYSDRIVE 3G3MV Multi-function Compact Inverters. The 3G3RV-PDRT2 DeviceNet Com-
munications Card is a DeviceNet communications interface card for the SYSDRIVE 3G3RV and
3G3FV High-function General-purpose Inverters.
The DeviceNet Communications Unit and Card are dedicated communications interface devices that
make it possible for the SYSDRIVE 3G3MV, 3G3RV, 3G3PV, and 3G3FV Inverters to communicate
with OMRON PLCs. Installing a DeviceNet Communications Unit/Card in the SYSDRIVE Inverter
allows a variety of operations to be performed from the Programmable Controller, such as monitoring
RUN/STOP and operating conditions and changing set values.
Note When a DeviceNet Communications Unit/Card is used, the RS-422/485 of the Inverter cannot
be used for communications.

Easy Communications

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The following two functions can be used simultaneously in DeviceNet communications between the
CPU Unit of a PLC and the Inverter.
• Remote I/O Communications
I/O is automatically transferred between a Slave (SYSDRIVE Inverter) and the CPU Unit without any
special programming in the CPU Unit. (Automatically transmits Inverter control inputs such as RUN or
STOP from a PLC to the Inverter and returns operation status of the Inverter or output frequency monitor
data from the Inverter to the PLC.)
• Message Communications
Message communications are performed between a CPU Unit to which a DeviceNet (Master) Unit is
mounted and Slaves (SYSDRIVE Inverters) by executing specific instructions (such as CMND and IO-
WR, depending on the model of PLC used) from the program in the CPU Unit. (Allows some parameter
setting and monitoring, Inverter output frequency, output voltage, or output current. If the remote I/O
communications is not performed, Inverter control data such as RUN or STOP can be input through this
message communications function.)
Remote I/O communications for the DeviceNet Communications Unit/Card are performed using
either 4 or 8 words allocated in the I/O Area of the PLC. The Inverter can be controlled using remote
I/O communications because the basic control I/O functions, frequency setting functions, and output
frequency monitoring functions are assigned to remote I/O. This allows the Inverter to be controlled
through simple I/O processing.
Communications with CS/CJ-series, C200HX/HG/HE, and CVM1/CV-
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series PLCs
The DeviceNet communications system is supported by CS/CJ-series, C200HX/HG/HE(-Z) and
CVM1/CV-series Programmable Controllers. More than twice as many Inverters can be connected in
comparison to SYSMAC BUS Remote I/O Systems to support even larger control systems.
Note 1. The maximum number of nodes that can be connected to the system depends on the type
of DeviceNet (Master) Unit used, whether the message function is used, and the number of
words used by remote I/O communications. See 1-5 DeviceNet System Configuration for
further details.
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Chapter 1