—
9 Operation
The common operating mode is called run mode.
Table 9: Run mode
LED
Display
Description
PWR LED = on
RUN LED = on
ERR LED = off
Power supply is present. PLC is in run
mode.
If the PLC is connected to the power supply, but does not operate, it is in stop mode. In stop
mode, the processor module does not control the system.
Table 10: Stop mode
LED
Display
Description
PWR LED = on
RUN LED = off
ERR LED = off/on
E.g., after the download of an applica-
tion, after a firmware update, an error
occured or the PLC was stopped by the
user, etc.
The PLC has an integrated diagnosis system to output diagnosis messages, e.g., parameter
setting is wrong or battery low. A diagnosis message is indicated by ERR LED = on.
Chapter 10 “Troubleshooting” on page 88
9.1 Status LEDs, display and control elements
Depending on the device type, various operating elements provided on the front panel can be
used to control the devices of the PLC system and/or to change the operating mode.
Operating elements:
● Status LEDs:
Indicates the availability of devices and components such as communication modules,
communication interface modules or function modules. Functionality and diagnosis of the
status LEDs depends on the specific module and is described in the device description of
the appropriate module. Possible status: on/off/blinking
● I/O LEDs:
Displays the status of the inputs and outputs.
● Display:
Available for some processor modules. It can be used for simple configurations and for
reading out diagnosis information.
Chapter 10 “Troubleshooting” on page 88
● Function keys and switches:
Allows to change the current operating modes/status manually.
9.2 PLC firmware/application update
During runtime it might be necessary to update the firmware of the modules, e.g., for security
reasons.
Operation
PLC firmware/application update
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