BECKHOFF DK9222-0909-0012 - Manual (Page 4)

I/O
Bus Terminal
Application Note DK9222-0909-0012
These 3 different pulse patterns can also be inverted, thus permitting ideal adaptation to the input circuit.
FU FU FU
Set value outputs
Signal output „synchronous axes“
Fig. 4 Synchronisation of several frequency converters via incremental encoder simulation
The new Bus Terminal does more than simply make a large number of analog interfaces superfluous. The possibility of using the
automatic step counting to implement closed control loops is of even greater significance. The digital technology offers more
functions in comparison to the expensive evaluation involved in analog technology, and at lower cost.
Supplementary functions integrated into the new Bus Terminal support operation and reduce the controller‘s power
requirement. Optimal operation of a stepper motor is easily possible through the specification of a ramp. Just two parameters,
the ramp start frequency and the ramp run-up time, are necessary to initialise the Bus Terminal. The controller now only needs
to specify the frequency. The Bus Terminal performs acceleration and braking tasks. The frequency change is calculated directly
in the Bus Terminal, and takes place, bumplessly at time intervals of 2 ms. The controller‘s computing load is thus reduced,
which permits a number of axis controllers to be implemented using just one intelligent Bus Terminal Controller.
The output terminal can be configured using the associated Bus Coupler or the controller. The output stage is compatible with
RS422. It can, however, also be operated with 24 V DC signals. Either operating mode can be used without the need for a
configuration switch or for parameterisation. The signal state is indicated by light emitting diodes. The LEDs are driven in time
with the outputs and each displays an active output.
– Pulse train output terminal RS422/24 V DC www.beckhoff.com/KL2521
– The modular fieldbus system for automation www.beckhoff.com/Busklemmen
New Automation Technology Beckhoff 4
For application notes see disclaimer on the last page