Led Indication - Hitachi MICRO-EHV+ Applications Manual

2.14 LED indication

The operating condition and the status of the external I/O can be checked on the LED display of the front cover.
Figure 2.2 Front cover of MICRO-EHV+
(1) POW LED
POW LED indicates whether power is properly supplied to the basic unit.
(2) OK LED
OK LED indicates the status of self-diagnostics.
(3) RUN LED
RUN LED indicates operating status.
(4) STATUS LED
STATUS LED indicates system initialization or FLASH memory writing.
(5) IN LED
IN LED indicates input status.
(6) OUT LED
OUT LED indicates output status.
Name Status
POW ON
OFF
OK ON
Blinking
OFF
RUN ON
OFF
STATUS Blinking
OFF
IN ON
OFF
OUT ON
OFF
N o t e
If boot project file is corrupt
does not complete, which causes STATUS LED keeps blinking and OK LED does not light up. In this case, download
a right project to recover.
Description
Power source is supplied.
Power source is not supplied.
Normal operation (PLC is ready to run)
Exception or warning status. Refer to Section 3.26 Troubleshooting.
Initialization status during power-up or Error status. Refer to Section 3.26 Troubleshooting.
RUN status
STOP status
Initialization status during power-up or flash memory is being written
Normal operation
Input is ON status
Input is OFF status
Output is ON status
Output is OFF status
or no boot project is stored in USB and internal FLASH memory
Figure 2.3 LED display (64-point type)
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Chapter 2 Specifications
initialization during power-up