Modbus - GE 339 Instruction Manual

S1 RELAY SETUP
NOTE:
NOTE

Modbus

6–12
GATEWAY IP ADDRESS
Range: Standard IP Address format
Default: 000.000.000.000
This setting specifies the Gateway IP Address for the Ethernet port.
CONNECTION TYPE
Range: Copper, fiber
Default: Copper
This setting specifies the connection type (Copper or Fiber) used for Ethernet
communication.
HIGH ETHERNET MSG ENABLE/DISABLE
Range: Enabled, Disabled
Default: Enabled
This setting enables or disables the High Ethernet traffic message from appearing under
high Ethernet traffic conditions.
When changing Ethernet settings, power to the relay must be cycled in order for the new
settings to become active.
The Modicon Modbus protocol is supported by the 339 . Modbus is available via the RS485
serial link (Modbus RTU). The 339 always acts as a slave device, meaning that it never
initiates communications; it only listens and responds to requests issued by a master
device. A subset of the Modbus protocol format is supported that allows extensive
monitoring, programming, and control functions using read and write register commands.
Refer to the 3 Series Communications Guide for additional details on the Modbus protocol
and the Modbus memory map.
The Modbus server can simultaneously support two clients over serial RS485. The server is
capable of reporting any indication or measurement and operating any output present in
the device. A user-configurable input and output map is also implemented.
The 339 operates as a Modbus slave device only
Select the Settings > Communications > Modbus > Protocol menu item in EnerVista
3 Series Setup software, or the
MODBUS PROTOCOL path to set up the modbus protocol as shown below.
Figure 6-5: Modbus protocol configuration settings
The following Modbus settings are available:
MODBUS SLAVE ADDRESS
Range: 1 to 254 in steps of 1
Default: 254
This setting specifies the Modbus slave address . Each device must have a unique
address from 1 to 254. Address 0 is the broadcast address to which all Modbus slave
devices listen. Addresses do not have to be sequential, but no two devices can have the
same address or conflicts resulting in errors will occur. Generally, each device added to
the link should use the next higher address starting at 1.
Please refer to the 3 Series Communications Guide for details on how to set up the Modbus
communications protocol.
SETPOINTS > S1 RELAY SETUP > COMMUNICATIONS >
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS