Electrical Design
‑84‑
Figure 3‑21 Daisy chain
Transmission Distance
The maximum number of nodes and transmission distance of standard RS485 circuit
vary with the baud rate, as listed in the following table.
Table 3–36 Maximum number of nodes and transmission distance
Transmission
Distance (m)
Baud Rate (kbps) Number of Nodes Cable Diameter
100 115.2 128 AWG26
1,000 19.2 128 AWG26
Termination Resistor Settings
Table 3–37 Termination resistor settings
Terminal Definition
Pin Description
Pin No.
Network Name
1
DIP switch for RS485
termination resistor selection
By default, the RS485
termination resistor is
disabled. To enable the RS485
termination resistor, set pins 1
and 2 to ON.
2
3.3.2 CAN Communication Wiring
CAN Communication with the PLC
The CAN bus has two RJ45 network ports on the power supply unit. Use the Cat 5e
shielded network cable and connect a 120 Ω termination resistor at both ends of the
bus to prevent CAN signals from reflecting.
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