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17. MAINTENANCE AND INSPECTION
17.4 Battery Voltage Low Detection and Battery Replacement
17 - 5
17
MAINTENANCE AND
INSPECTION
18
TROUBLESHOOTING
APPENDICES
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Example of alarm output to external device (lamp, buzzer, etc.)
The following describes an example of outputting the battery voltage low signal from a FX series PLC to an
external device with system information.
Condition: The Write Device is "D20" and all data is used (the button is clicked on the setting screen of drawing
software) for the system information assignment.
D36 b12: Battery voltage low (System Signal 2-2)
Turned on upon a battery voltage drop.
Used as shown below in the sequence program.
For details of system information, refer to the following.
GT Designer3 Version1 Screen Design Manual (Fundamentals)
M32
Output to external device of PLC
Activated the output upon battery
voltage low detection.
Battery voltage low
M8000
MOV D36 K4M20
RUN monitor
Y***
"*" indicates the output number at which the external device is connected.