CHAPTER 6: SETPOINTS
S1 RELAY SETUP
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–13
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
350 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 350 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
350 Communications Guide
for details on how to set up the Modbus
communications protocol.
