6–12
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S1 RELAY SETUP
CHAPTER 6: SETPOINTS
Connection Type
Range: Copper, fiber
Default: Copper
This setting specifies the connection type (Copper or Fiber) used for Ethernet
communication.
NOTE
NOTE:
When changing Ethernet settings, power to the relay must be cycled in order for the new
settings to become active.
Modbus
The Modicon Modbus protocol is supported by the 345. Modbus is available via the RS485
serial link (Modbus RTU). The 345 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
345 Feeder Protection System 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 345 operates as a Modbus slave device only
Select the
Settings > Communications > Modbus > Protocol
menu item in EnerVista SR3
Setup software, or the
SETPOINTS > S1 RELAY SETUP > COMMUNICATIONS > MODBUS
PROTOCOL
path to set up the modbus protocol as shown below.
Figure 6: 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
345 Communications Guide
for details on how to set up the Modbus
communications protocol.