item Controller BL 1-04 /C
― Product manual
44
Master frequency output X1
The connector X1 also accommodates the master frequency output (encoder emulation). To use this function, X1 must be
configured as the master frequency output.
Characteristic
Value
Number of lines
Programmable 1 to 213 and 214 lines/revolution
Track signals A, B, N
as per the RS422 specification
Special feature
N track can be deactivated
Limit frequency
f
limit
> 10 MHz
The signals are generated based on the angle of rotation of the encoder with a freely programmable line count.
In addition to the track signals A and B, the master frequency output also provides an index pulse. Once per revolution, this
index pulse turns high (for the programmed number of lines) for half of a signal period.
Please also note that the track signals will not be automatically output with a constant frequency. They may also be generated
as so-called "pulse packets" depending on the covered rotational angle of the source. This means that the interface for any
downstream circuits must be suitable for incremental encoders. As a result, the measurement of gate times or the analysis of
the time between two lines for determining a speed value is possible only to a limited extent.
8.10 Time response of the digital inputs
The digital inputs are digitally filtered to improve the interference suppression. The following illustration shows the filter time
mechanism. In addition, the special reaction to the "Positioning start" function is also shown. Although the signal is evaluated
during the position controller cycle t
x
the start of a movement will be performed within the interpolation cycle time matrix t
p
.
speed controller cycle time t
n
position controller cycle time t
x
t
t
interpolation cycle timet t
p
t
digital input
high
low
t
t
start positioning
high
low
t
Detecting the change at the
digital input
4 x t
x
t
start
high
low
Figure 15: Filter time mechanism in the case of digital inputs
