1 X-NET fieldbus
1-1. Function summarize
1-1-1.
Introduction
X-NET fieldbus is used between XD series PLC or XD series PLC and TG/TN series HMI.
The filebus has the advantages of intelligence and digitize, the max speed can up to 3M. It can
work through RS485 and OC (optical fiber) for long distance and high speed communication. It
has faster speed and better stability than Modbus protocol.
1-1-2. Wiring mode
Please use serial connection for TBN protocol running on RS485. As the star connection has low
driving ability and short communication distance, strong signal reflection, higher communication
error rate. It is not recommended to use star connection.
TBN_RS485 baud rate range is 600bit~3Mbit. The communication speed and medium are related
to the local environment. As the TBN_RS485 using electrical signal to transfer data, there are
some requirements for the communication distance. Please refer to the following table.
Please use copper shielded wire up 0.3mm
2
for TBN_RS485 fieldbus.
The relationship between TBN_RS485 filedbus cable length and baud rate:
Baud rate
Wire length
9.6-187.5Kbit/s
1000m
500Kbit/s
400m
1.5Mbit/s
200m
3Mbit/s
100m
TBN_RS485 cable is recommended to use shielded twisted pair cable (ASTP-120Ω for
RS485&CAN, 21AWG, red blue twisted pair), according to the standard UL758-2008 &UL1581.
The shileded layers include Aluminium foil 100% and tinned copper net 70%.
The following diagram is the cable profile:
There are three kinds of connection methods for PLC.
1. PLC RS485 port on the main unit
2. PLC expansion BD board XD-NE-BD
3. PLC expansion ED board
