Leds Of The Head Station - Mitsubishi Electric MELSEC ST Series Installation Manual

Description of the Modules
3.1.2

LEDs of the Head Station

LED
RUN
ERR.
REL.
DIA
BF
M1
M0
SYN.
FRE.
20
RUN M 1
ERR. M 0
REL.
DIA SYN.
BF FRE.
LED
Meaning
status
ON Normally operating
b
Self-diagnostics are being executed
Flickering
b
Forced output test mode is being executed
b
The external power is off.
OFF
b
A watchdog timer error has been occured.
ON A error occured in the head station or in a slice module.
b
Communication error
Flickering
b
The station number has been changed after the head station was powered on.
OFF Normally operating (no error)
During online module change the settings of the selected slice module were saved and the
ON
module can now be remounted.
Flickering After changing a slice module the settings are loaded to the new module.
OFF Online module change has been completed or is not selected.
ON Extended diagnostic information being sent to master station
Flickering Self-diagnostics of head module being executed.
OFF No extended diagnostic information.
ON PROFIBUS/DP data communication is stopped.
OFF PROFIBUS/DP data communication normal
The LEDs M0 and M1 indicate the maximum input/output points setting status of the head
module:
Maximum I/O
points
—
32
64
128
256
ON SYNC mode is activated.
OFF Normally operating
ON FREEZE mode is activated.
OFF Normally operating
LED status
M1 M0
OFF OFF
OFF ON
ON OFF
ON ON
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