Bus Configuration for I/O Modules (RAD-ISM-900-EN-BD-BUS only)
2476_en_I
PHOENIX CONTACT
5-7
Figure 5-3
Error message – Multiple I/O communication control sources on same
channel
5.1.5
Configuring Radios Connected to the PLC /Modbus Master
General Configuration
To connect a RAD-ISM-900-EN-BD-BUS radio to a Modbus master device – either Modbus
RTU serial, or Modbus TCP Ethernet based (i.e., a PLC or PC-based controller), the radio
must be configured as a master (refer to Figure 4-7 on page 4-8).
Configuration when Connecting to a Modbus RTU Master Controller
Modbus RTU masters connect to either the RS-232 or RS-422/485 serial ports on the radio.
1.
Configure the serial port’s physical parameters (baud rate, stop bits, etc.) (refer to “I/O
Ports” on page 4-17).
2.
Configure the RAD-ISM-900-EN-BD-BUS communication stream to the same
communication stream as that used by the RAD-ISM-900-EN-BD-BUS unit’s I/O (refer
to “Serial Ports” on page 4-18).
Configuration When Connecting to a Modbus TCP Ethernet Master Controller
Modbus TCP master devices connect to the Ethernet port on the radio.
1.
Configure the Ethernet port’s link speed and duplex settings (refer to “LAN
Configuration” on page 4-8).
2.
Configure the Modbus Gateway parameter to “Network Gateway” and enter “502” as
the port number (refer to “Modbus/TCP Gateway” on page 4-18).
3.
Configure the RAD-ISM-900-EN-BD-BUS communications stream to the same
communications stream as that used by the RAD-ISM-900-EN-BD-BUS unit's I/O (refer
to “Serial Ports” on page 4-18).
Ensure that there is only one source controlling the I/O: either a single Ethernet master
source, or a single serial source, but NOT both on the same communications stream.
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