Connection Diagram; Grounding; Communication Setting; Communication Specifications - Mitsubishi Electric LE7-40GU Instruction Manual

Connection diagram

Use single pair wiring for N:N Network wiring.
CPU module built-in RS-485 port
FX5-485-BD
FX5-485ADP
SDA
Termination
SDB
Resistance
110 
*2
RDA
RDB
SG
*1 Be sure to apply Class D grounding to the shield of the twisted pair cable to be connected.
*2 Terminal resistor should be attached to both ends of the line. LE7-40GU, the built-in RS-485 port of the CPU module, FX5-485-BD, and
FX5-485ADP, have built-in terminating resistors. Set the terminal resistor with the selector.

Grounding

Grounding should be performed as stated below.
• Perform Class D grounding. (Ground resistance: 100  or less)
• Independent grounding should be performed for best results.
• When independent grounding cannot be performed, perform "shared grounding" as shown in the following figure.
Tension Other
Controller equipment
Independent grounding
(Best)
The grounding wire size should be AWG 24 to 16 (cross-section area: 0.2 to 1.5 mm
The grounding point should be close to the tension controller, and all grounding wires should be as short as possible.
6.3

Communication Setting

Communication specifications

The communication specification of the N:N Network is as follows.
Communication specifications
Item
Transmission standard
Maximum transmission distance
Communication method
Wiring method
Communication procedure
Transmission speed (baud rate)
Insulation
6 N:N NETWORK
90
6.3 Communication Setting
LE7-40GU
SDA
SDB
RDA
RDB
SG
Class D grounding
(Ground resistance: (Ground resistance:
 *1
100 or less)
Tension Other
Controller equipment
Shared grounding
(Good)
LE7-40GU
SDA
SDB
RDA
RDB
SG
Class D grounding
(Ground resistance:

*1
100 or less)
Tension Other
Controller equipment
Common grounding
(Not allowed)
Specifications
Conforms to RS-485 standard
50 m
Bidirectional half-duplex
One-pair wiring
N:N Network (pattern 2 only)
N:N Network: 38,400 (bps)
Non-isolated (between the communication line and CPU)
LE7-40GU
SDA
Termination
SDB
Resistance
110 
*2
RDA
RDB
SG
Class D grounding

*1
100 or less)
2
).