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5 POWER DISTRIBUTION MODULES
MELSEC-ST
5.3.1 Operating status LEDs
LED
indication
LED status
Operating status
On Normal
Flickering
(0.25s intervals)
Selected as a module to be replaced online.*1
Flickering
(1s intervals)
Communication with the master station has stopped.*2
Parameter setting error *2
Other slice module fault
Internal bus error occurring
RUN
Off
External power supply off, hardware fault, internal bus error occurring
On Hardware
fault
On (0.5s intervals) 24VDC voltage low
ERR.
Off Normal
On Normal
SYS.
Off
24VDC voltage low, 5VDC voltage low
On Normal
AUX.
Off
24VDC voltage low
*1: The LED flickers when the module is selected as the target of online module
change.
Do not replace the power distribution module as it cannot be the target of online
module change.
*2: Refer to the head module manual for details.
Summary of Contents for MELESEC-ST
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Page 23: ...A 21 A 21 MEMO...
Page 114: ...10 22 10 22 10 MOUNTING AND INSTALLATION MELSEC ST MEMO...
Page 125: ...11 11 11 11 11 EMC AND LOW VOLTAGE DIRECTIVE MELSEC ST MEMO...
Page 163: ...Index 2 Index 2 MEMO Ind...
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