This involves a play-free electronic switching cam encoder (abbreviated to: NOCN) with a maximum of four galvanically separated switching outputs (cams), which can be set by the customer and which are activated or deactivated depending on the relevant position of the drive shaft.A parameterisable multiturn absolute encoder with CANopen interface plus the switching cam encoder printed circuit board with separate controller are integrated into the compact housing. The encoder’s CANopen position signal and the switching outputs can be parameterised separately.

Parameterisation is carried out via the relevant CANopen objects in accordance with the encoder profile according to CiA, DS 406, revision 4.01.

The NOCN has a fault monitoring system which outputs a fault message via the CANopen bus (emergency message) on detection of a fault.

Absolute encoder

The absolute encoder is equipped with a CANopen interface. Its resolution is 12 bits (= 4096 steps) or 13 bits (= 8192 steps) per revolution. The measuring range set in the factory is 4096 revolutions. The absolute encoder’s position data can be parameterised using CANopen objects.

16 or 256 revolutions are possible as the measuring range on request, as well as a velocity signal with adjustable gate time

Switching outputs (cams)

The electronically activated cams can be used to control potential-free, galvanically separated switching processes. The switching outputs are implemented using mechanical relays with long service lives and using PhotoMOS semiconductors – as well gavanically separated. Model 120 contains four relays. Model 79 contains four relays and two PhotoMOS.

The switching information for the cams is taken from the absolute encoder.  In comparison with an electromechanical switching cam encoder, switching output activation and deactivation is carried out electronically without play or wear.

Each of the cam relays has a changeover contact, which is routed out via an M12 connector. The PhotoMOS semiconductors provide normally open contacts (NO). Different connector assignments are possible on request by the customer.

The precise NOCN measuring range point at which each relay is to switch (switching flanks) can be set using the relevant CANopen objects.

Within the measuring range, one on and off process is possible per switching output. Customer-specific switching procedures are also possible ex-works.

If operating voltage is missing, the cams do not switch