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S1 RELAY SETUP
NOTE:
NOTE
Modbus
6–14
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 . Modbus is available via the RS485
serial link (Modbus RTU). The 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
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 operates as a Modbus slave device only
Select the Settings > Communications > Modbus > Protocol menu item in software, or
the
SETPOINTS > S1 RELAY SETUP > COMMUNICATIONS > MODBUS PROTOCOL
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 Communications Guide for details on how to set up the Modbus
communications protocol.
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
path to set up
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