02/05 AWB2724-1566GB
17
4 Using the XN-PLC
Switch-on behaviour
After switching on the supply voltage, the PLC checks whether a
boot project is loaded in flash memory. If it is, and the operating
mode switch is in the RUN position, the boot project is written to
the PLC’s SRAM and is started. If the flash memory contains no
boot project, the PLC remains in NOT READY state.
CPU status indicator
The NOT READY state is signalled by LEDs RUN/STP and SF. The
PLC goes into this state when an error has occurred during the
start. The CPU remains in STOP state. Once the fault has been
rectified, you can restart the CPU.
Configuring the start-up behaviour with XSoft
The start-up behaviour settings define mainly the handling of the
retentive variables. Changed settings take effect only when the
power supply is switched on.
You can change the settings under
PLC Configuration
: On the
Other Parameters
tab, select one of the following options in the
Start Behaviour
field:
• HALT
• COLDSTART
• WARMSTART
HALT
The user program is not started, regardless of the position of the
operating mode switch.
COLDSTART
Precondition: The operating mode switch is in RUN position.
The variables are initialized before the PLC is started.
WARMSTART
Precondition: The operating mode switch is in RUN position.
The variables are initialized before the PLC is started.
CPU status
RUN/STP-LED
SF-LED
RUN
On (green)
Off
STOP
Flashing (green)
Off
NOT READY
Off
On (red)
Figure 16:Configuring the start-up behaviour
Summary of Contents for XION-PLC-CANopen
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