Wiring A Shielding Wire (Class-D Grounding) - Mitsubishi Electric FX3U-232-BD User Manual

FX Series PLC User's Manual - Data Communication Edition
Inverter Communication
• FX -485-BD-RJ
3G
4. Connecting a terminal resistor to the inverter
Communication may be affected by noise echo depending on the transmission speed and transmission
distance. When communication is hindered by noise echo, connect a terminal resistor to the inverter.
1) When the PU connector or RS-485 connector (S500 Series) is used
- Connect a terminal resistor between pin No. 3 (RDA) and pin No. 6 (RDB).
- Connect a distributor to the PU terminal because terminal resistors cannot be connected.
- Connect a terminal resistor only to the inverter located furthest away from the FX PLC.
2) When the FR-A5NR is used in connection
- Connect a terminal resistor chip (which is supplied together with the FR-A5NR) between the RDB and
RDR terminals in the most distant inverter.
3) When the FR-E7TR is used in connection
A terminal resistor is built into the FR-E7TR. Set the terminal resistor switch in the E700 Series inverter
located at the end to "100".
Terminal
resistor
switch
4) When the inverter built-in RS-485 terminal is used
A terminal resistor is built into the RS-485 terminal. Set the terminal resistor switch in the F700/A700
Series inverter located at the end to "100".
Terminal
resistor
switch
4.6

Wiring a Shielding Wire (Class-D grounding)

Perform Class-D grounding only to one side of a cable according to the absence/presence of the grounding
terminal.
1. When the
FG
Connect the
FG
2. When the
FG
Perform Class-D grounding directly to the shielding wire of the cable.
Terminal resistor
selector switch
OPEN
100
terminal is provided in the communication equipment
terminal to the (grounding) terminal of the PLC requiring Class-D grounding.
terminal is not provided in the communication equipment
For details on connection, refer to each wiring diagram.
4 Wiring
4.6 Wiring a Shielding Wire (Class-D grounding)
E-33
A
B
C
D
E
F
G
H
I
Apx.A