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
The CAN Bus requires that 120 Ohm resistors be at each end of the CAN bus The resistors in parallel
yield 60 Ohms of resistance between the CAN High and CAN Low cables.
One of these resistors is located inside the qSCALE maestro S6 Controller. The other is in the WGX
angle sensor contained in the Cable Reel.
The signals are generated by nodes on the CAN BUS. The nodes generate, consume, or both generate
and consume data over a CAN Bus. The CAN High signal is a mirror image of the CAN Low signal.
Adequate voltage supply is required for power to the sensor and all nodes on the CAN Bus. A common
source of problems over a CAN Bus is a Voltage drop because of resistance when a connection is
corroded. As resistance increases, a corresponding voltage drop occurs corrupting the signal generat-
ed. The CAN signal will begin to lose the top of the high signal and no longer mirror the reflection (pari-
ty) of the CAN low signal.
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