GE C30 Instruction Manual page 151

CHAPTER 5: SETTINGS
— When using the Modbus protocol on the RS232 port, the C30 responds regardless of the
MODBUS SLAVE ADDRESS
programmed. For the RS485 port, each device on the serial bus must have a unique slave address
MODBUS SLAVE ADDRESS
from 1 to 254. Address 0 and addresses from 248 and up are reserved by the Modbus protocol specification, and so their
use here is not recommended. Address 0 is the broadcast address that all Modbus slave devices listen to. When
is set to 0, the C30 accepts broadcast messages, but in compliance with protocol specifications for
SLAVE ADDRESS
broadcast messages, never replies. Addresses do not have to be sequential, but no two devices can have the same
address or conflicts resulting in errors occur. Generally, each device added to the link gets set to use the next higher
address starting at 1. When using Modbus TCP/IP, the client must use the programmed
Unit Identifier field.
— Modbus over TCP/IP can also be used on any of the Ethernet ports. The listening TCP port 502
MODBUS TCP PORT NUMBER
is reserved for Modbus communications, and only in exceptional cases when
port. The
MODBUS TCP PORT NUMBER
0 disables Modbus over TCP/IP, meaning closes the Modbus TCP port. When the port number is changed to 0, the change
takes effect when the C30 is restarted. When it is set to 0, use the front panel or serial port to communicate with the relay.
Do not set more than one protocol to the same TCP/UDP port number, as this results in unreliable operation of
those protocols.
NOTE
5.3.4.9 Protocol selection
The menu setting allows selection of one of the following protocols: DNP 3.0, IEC60870-104, or IEC60870-103.
PROTOCOL
For any change to take effect, restart the unit.
The table shows which of DNP 3.0, IEC 60870-5-104, IEC 60870-5-103, and IEC 61850 protocols are operational on the
RS232, RS485, and Ethernet ports. It shows all possible combinations of the
Table 5-8: Port and protocol combinations
PROTOCOL DNP CHANNEL 1(2) PORT
setting settings
DNP Channel 1: Eth TCP
Channel 2: Eth TCP
Channel 1: Eth TCP
Channel 2: none
Channel 1: none
Channel 2: Eth TCP
Channel 1: Eth UDP
Channel 2: none
Channel 1: Eth TCP
Channel 2: RS485
Channel 1: Eth TCP
Channel 2: RS232
Channel 1: Eth UDP
Channel 2: RS485
Channel 1: Eth UDP
Channel 2: RS232
Channel 1: RS485
Channel 2: Eth TCP
Channel 1: RS232
Channel 2: Eth TCP
Channel 1: RS485
Channel 2: RS232
Channel 1: RS232
Channel 2: RS485
Channel 1: RS485
Channel 2: none
C30 CONTROLLER SYSTEM – INSTRUCTION MANUAL
setting sets the TCP port used by Modbus on Ethernet. A
RS232 RS485
Modbus Modbus
Modbus Modbus
Modbus Modbus
Modbus Modbus
Modbus DNP
DNP Modbus
Modbus DNP
DNP Modbus
Modbus DNP
DNP Modbus
DNP DNP
DNP DNP
Modbus DNP
MODBUS SLAVE ADDRESS
MODBUS TCP PORT NUMBER
MODBUS TCP PORT NUMBER
and
PROTOCOL DNP CHANNEL 1(2) PORT
Ethernet
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
DNP, Modbus, IEC 61850
Modbus, IEC 61850
Modbus, IEC 61850
Modbus, IEC 61850
PRODUCT SETUP
MODBUS
value in the
is set to any other
of
5
settings.
5-33