Diagnostics; Preliminary Checks - Mitsubishi Electric MELSEC-F FX3U-CAN User Manual

FX -CAN User's Manual
3U

14. Diagnostics

STARTUP AND MAINTENANCE
PRECAUTIONS
• Do not touch any terminal while the PLC's power is on.
Doing so may cause electric shock or malfunctions.
• Before cleaning or retightening terminals, cut off all phases of the power supply externally.
Failure to do so may cause electric shock.
• Before modifying or disrupting the program in operation or running the PLC, carefully read through this manual and the associated
manuals and ensure the safety of the operation.
An operation error may damage the machinery or cause accidents.
STARTUP AND MAINTENANCE
PRECAUTIONS
• Do not disassemble or modify the PLC.
Doing so may cause fire, equipment failures, or malfunctions.
For repair, contact your local Mitsubishi Electric representative.
• Turn off the power to the PLC before connecting or disconnecting any extension cable.
Failure to do so may cause equipment failures or malfunctions.
• Do not drop the product or exert strong impact to it.
Doing so may cause damage.
• Turn off the power to the PLC before attaching or detaching the following devices.
Failure to do so may cause equipment failures or malfunctions.
- Peripheral devices, display module, expansion boards, and special adapters
- Input/output extension units/blocks, FX Series terminal blocks and special function units/blocks
- Battery and memory cassette
14.1

Preliminary Checks

Check the RUN, FROM/TO, Tx/Rx, ERROR and POWER LED status.
1. RUN LED
LED State
OFF
*1
SINGLE FLASH
*1
BLINKING
*1
FLICKERING
ON
*1. RUN LED has three kinds of flicker states: single flash, blinking, and flickering. This LED flickers as
follows.
SINGLE FLASH
BLINKING
FLICKERING
FX 3U -CAN is in Layer 2 offline mode.
®
FX -CAN is in CANopen STOPPED state.
3U
Periodically turns ON for 100 ms, and OFF for 1 s.
®
FX -CAN is in CANopen PRE-OPERATIONAL state.
3U
Turns ON/OFF in 200 ms intervals.
LSS Services in progress
Turns ON/OFF in 50 ms intervals.
® ®
• CANopen mode: CANopen
• Layer 2 mode: Layer 2 online mode
0.2 s
0.2 s 0.2 s
0.05 s 0.05 s
Description
OPERATIONAL state
1 s
14 Diagnostics
14.1 Preliminary Checks
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