Functional description
4 KL2521
Functional description
Introduction
The KL2521 output terminal generates a binary signal with a variable
frequency. The peripheral side of the electronics is electrically isolated from
the internal K-Bus, and therefore also from the fieldbus. The output
frequency can be adjusted. 16 bit values (signed integer) can be provided
for this adjustment through the controller's process image. These values
modify the output frequency from zero up to a pre-selected maximum
frequency in equal increments - there are 32767 (15 bits) steps in each
direction (right/left).
process image By default, the KL2521 terminal occupies three bytes in the process image.
The mapping of the KL2521 can be set by means of the controller or by the
Bus Coupler's configuration interface using the Beckhoff KS2000
configuration software.
operating modes In addition to the FM (frequency modulation) operating mode, the KL2521
can also be used to control stepper motors with pulse-direction control (frq.
cnt pulse mode). Incremental transducer simulation is another operating
mode. It is possible to connect an incremental transducer directly. Such
inputs are present on many servo amplifiers and frequency converters.
default setting The KL2521 is set to FM mode by default, with a basic frequency of 50 kHz
and a resolution of 15 bits. The number of pulses output is read back into a
16 bit register. If the counter overflows a signal is sent to the controller.
This is indicated by Status.3 (overflow) or Status.2 (under flow). In parallel
with these two bits, Status. 6 is set as a general error bit. This makes the
extension to more than 16 bits easier for the controller software to handle.
The overflow can also be read from register 3 (internal 32 bit extension).
The counter can be reset to 0 through Control.5. By default, the counter is
cleared by a rising edge (Feature.4 = 1). If Feature.4 = 0, the function is
level-controlled.
If bit Feature.10 = 1, the counter is set by bit Control.5 to a
value defined by register R0 (lower word) and register R1 (higher word).
ramp function An internal ramp function raises/lowers the current frequency to the pre-set
maximum frequency in accordance with the parameters set in registers
40/41. This is activated by FeatureBit.5. The base frequency for the ramp
can be selected by FeatureBit.6. Status.1 is set while a ramp is being
followed.
The releasing of Control.0 can be used to deactivate the function. During
operation this can also be done by Control.1. In this way the user can
change the base frequency during operation very quickly. Setting
Control.0 = 1 (confirmed by Status.0) the values in registers 38/39 are used
instead of those in registers 36/37 (Control.0 = 0).
The input signals T and Z are transferred directly from the terminal to the
controller in the status byte (Status.4 / Status.5). The signals are not given
any internal pre-processing.
(21 pages)
(21 pages)
(21 pages)
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