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FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
21 FX3U-FLROM-16/64/64L (Memory Cassette)
21.4 PROTECT Switch
21.4 PROTECT Switch
21.4.1 PROTECT switch setting
Reading from and writing to memory cassette operations can be performed by
using the programming tool.
Because sequence programs are written by an electronic format, a special
ROM writer and ultraviolet eraser are not required.
The PROTECT switch must be turned OFF to enable writing.
21.4.2 PROTECT switch operation
1. Preparing the operation tools
Set the PROTECT switch knob by using the tip of a pair of tweezers, a
precision screwdriver, or a tool with a tip width of approx. 0.8mm (0.04").
Do not use objects with round tips, as the round tip can easily slip off the
switch knob, possibly resulting in an incorrect setting.
2. Switch operation procedure
As shown in the figure below, the switch knob can be "pushed" or "pulled". When setting the switch, do not
set it in an intermediate position.
21.4.3 Precautions when setting and using the switch
• Leaving the switch knob at an intermediate position for an extended period can cause an equipment
failure.
• Also use care to avoid scratching the PCB when setting the switch.
PROTECT
switch
Tool tip
Shape of tool tip
Good
Bad
Push
direction
Switch setting
tool
Switch
knob
Switch case
Pull
direction
OFF

ON OFF

ON
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