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4.5
Using the Status Indicators
The status indicators on the control panel display the current operating mode and
are helpful in troubleshooting an error condition. These indicators correspond to
the LED indicators on a hardware S7 PLC.
You cannot change the status of the controller by clicking the status indicators.
If the control program reaches a break point set by the STEP 7 Program Editor,
both the RUN and STOP indicators turn on while the breakpoint is active: the RUN
indicator flashes, and the STOP indicator is on.
During a change from STOP mode to RUN mode, the RUN indicator flashes, and
the STOP indicator is on. When the STOP indicator turns off, the outputs are
enabled.
The table below describes the different status indicators for the control panel:
Indicator
ON
BATF
INTF
EXTF
BUSF1
BUSF2
FRCE
RUN
STOP
Flashing Indicators
Flashing patterns of the RUN and STOP indicators provide additional information
about the controller or the STEP 7 user program:
Windows Automation Center, WinAC Slot Version 4.0
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
Description
Power supply. Lights up (solid) when you start the controller. Turns off
when you power off the controller.
Battery fault.
This indicator lights up (solid) to show error conditions within the
controller, such as programming errors, arithmetic errors, timer errors,
and counter errors.
If the STEP 7 user program handles the error by executing OB 80 or
OB 121, the INTF indicator goes off after 3 seconds if there is no
subsequent error condition.
This indicator lights up (solid) to show error conditions that exist outside
of the controller, such as hardware faults, parameter assignment errors,
loss of communication or other communication errors, and I/O faults.
If the STEP 7 user program handles the error by executing OB 122, the
EXTF indicator goes off after 3 seconds if there is no subsequent error
condition.
These indicators light up (flashing) to identify fault conditions in the
communication with the distributed I/O. BUSF1 corresponds to the
MPI/DP communications interface and BUSF2 corresponds to DP.
This indicator lights up (steady), if variables are being forced. A force job
as configured in STEP 7 enables you to force variables of your choice to
values that you specify.
Lights up (solid) to show the operating mode (RUN or STOP).
When RUN is flashing and STOP is lit (solid), the control program has
reached a breakpoint. (RUN light flashes at 0.5 Hz.)
Note: The RUN and STOP indicators show the actual operating mode of
the controller. The RUN and STOP mode selector switch positions show
the selected mode (similar to the mode selector switch position on an S7
CPU front panel), which can differ from the current operating mode. For
example: Changing the operating mode with STEP 7 causes the status
indicators to change, but the mode selector switch does not change.
Operating the Controller - CPU 41x-2 PCI
65
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