WIKA Mobile Control LP  
1540 Orchard Drive 
Chambersburg, PA 17201 
 
qSCALE maestro (PLC v01.00.00) Service Manual / Issue E (HMI v1.0.0) 04/2018 / rbm.
 
Service : (717) 217-2250 
Parts / Sales : (717) 217-2269 
www.wika-mc.com 
 
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HIRSCHMANN MCS 
6.3 Indicator Definitions 
Indicators are located on the Central Control Unit and the Console to assist with troubleshooting basic 
power and software issues. 
6.3.1  Indicators on Central Control Unit 
Visual LED indicators are located on the top of the Central Control Unit. 
 
 
 
PON  Is lit solid when Power to the controller is ON 
POK  Is lit solid when Power is OK indicating that the power supply circuitry is 
good and the controller is providing the expected amount of power output to 
the rest of the system. 
SR  Is lit solid when the Safety Relay is Active. 
If this light is off it indicates a segmentation fault, memory leak, or another 
condition that prevents the system from showing safe working areas.  
A soft reset will not reset the safety relay, to do so you must fully power 
down the controller and power it back on. 
RUN  Is lit solid when CoDeSys Application is RUNning. 
ERR  Software ERRor 
The system software controls this LED; the normal case is that the LED is 
off.  If the LED is ON, or a flashing code is shown, then there is an error. 
Note: The ERR light will turn on briefly during start-up and then turn off. This 
is normal behaviour. 
S1  Application-Specific control indicator. 
If the LED is ON solid, the application is running; if it is flashing, there is a 
safety system malfunction or missing crane information. 
 
 
6.3.2 Indicators on Console 
See Section 3.5 for definitions of indicators on the console.