Terminal Arrangement; Ground Wiring; Wiring Precautions - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Terminal arrangement

V+
CH1 I+
COM
V+
I+
CH2
COM
24 V
Left side of terminal arrangement
Display name
V+
I+
COM
V+
I+
COM
24V


Ground wiring

Grounding
Perform the following.
• Perform class D grounding (Grounding resistance: 100  or less).
• Ground the programmable controller independently when possible.
• If the programmable controller cannot be grounded independently, perform the "Shared grounding" shown below.
Other
PLC
equipment
Independent grounding
(Best condition)
• Bring the grounding point close to the PLC as much as possible so that the ground cable can be shortened.

Wiring precautions

Wiring precautions are indicated below.
• Use separate cables for the external I/O signals of the AC control circuit and the analog output module so that they are not
affected by surge or induction on the AC side.
• Do not approach or bundle with the main circuit line, high voltage line, and load line from other than the PLC. Keep it far
from circuits including high frequency such as high voltage line and inverter load main circuit. t becomes susceptible to
noise, surge, and induction.
• Provide a single-point ground for the shield wire and the shielded cable at the PLC side. However, depending on the
external noise situation, it may be better to ground on the external side.
2 FX5-4DA
242
2.6 Wiring
V+
I+ CH3
COM
V+
I+
CH4
COM
24G
Description
CH1 Voltage output
CH1 Current output
CH1 Voltage/current output common
CH2 Voltage output
CH2 Current output
CH2 Voltage/current output common
External 24 V +24 V terminal
Unused terminal
24 V external ground terminal
Other
PLC
equipment
Shared grounding
(Good condition)
Right side of terminal arrangement
Display name
V+
I+
COM
V+
I+
COM
24G

Other
PLC
equipment
Common grounding
(Not allowed)
Description
CH3 Voltage output
CH3 Current output
CH3 Voltage/current output common
CH4 Voltage output
CH4 Current output
CH4 Voltage/current output common
External 24 V Ground terminal
Unused terminal
24 V external ground terminal