Relationship Between Switch Operation And Leds And Led Displays - Mitsubishi MELSEC Q4ARCPU User Manual

4.5.2 Relationship between switch operation and LEDs and LED displays

(1) When a program is written while the CPU module is stopped
T Conduct the following procedure when a program is written while the
CPU is stopped.
(a) Key switch
RUN LED
LED display : Off
(b) Key switch
RUN LED
LED display : Off
(c) Key switch
RUN LED
LED display : Off
POINT
• For the Q4ARCPU change the CPU module to RUN after conducting a
reset operation after program write (excluding write during PLC RUN).
• Turning the switch to RUN without conducting a reset operation will leave
the CPU module in the STOP status to thus execute the next display.
RUN LED
LED display : "PRG.CHECK!!" display
After this change the CPU module to the RUN status by conducting a
reset operation using the key switch. However, the CPU module's internal
information for devices etc. will be cleared
• The method for not clearing is to again turn the key switch from STOP to
RUN. However,, there is a possibility that pulse instructions etc. will not
function properly so be sufficiently cautious.
*: When Remote STOP is switched to RUN, the CPU module is not put in
the "PRG. CHECK" status but in the RUN status.
(2) When conducting latch clear
When conducting latch clear conduct the following RUN/STOP key switch
procedure.
(a) Key switch : Turn to L.CLR several times until the USER LED
USER LED : Flicker ............................ Latch clear execute
LED display : "L.CLR RDY" display
(b) Key switch : Turn to L.CLR
USER LED : Lights for 2 seconds ....... Latch clear completed
LED display : "L.CLR OK" displayed for 2 seconds
: STOP
: Off .............. CPU module STOP status
(conduct program write)
: RESET
: Off .............. CPU module RESET status
: RUN
: Off .............. CPU module RUN status
: Flicker
flickers
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preparation status