MICRO-EPSILON CSP2008, Instruction Manual

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Page 35
Operation
CSP2008
5.3.9.3 Time Base
The time base controls the timing of the controller, mainly for sensors with different
measuring rates.
Cycle selection internal /
external (sync input) Selection of an internal master clock or external
synchronization for the controller. If “internal” is
selected, the controller shows the value in the
field “period in µs”.
Master clock in kHz Value Highest measurement frequency of the connected
sensors. The master clock is the smallest timing
unit in the controller. Value range 0.1 ... 100 kHz.
When using a RS422 extension terminal, the mas-
ter clock should not exceed 10 kHz. Otherwise,
measuring values are transmitted twice.
Operating mode Continuous Asynchronous processing of the sensors. The
Divider calculation frequency
parameter
for the measuring frequency must be specified.
Application: e.g. operation of ILD 1700 and ODC
2500.
Synchronous Synchronised processing of the sensors. The
controller automatically determines the
Divider
calculation frequency
parameter for the
measuring frequency.
Divider calculation
frequency Value 1 … 32 Matching sensors with different measuring rates to
each other. The internal calculation in the control-
ler is performed in measurement cycles.
The value must be specified in operating mode
continuous
. The controller determines the value
automatically in the operating mode Synchronous.
Divider synchroniza-
tion Value 1 … 32 Divider of the master clock for the output of the
synchronization pulse. Divider = 1 means that a
synchronization pulse is output with each master
clock.
Offset Value 0 … 31 Offset in order to move the position of the syn-
chronization pulse in master clock.
Measured values can be specifically excluded from processing by the parameter
Di-
vider Synchronization.
However, all measured values are included in processing
in the CSP2008 in the case of input averaging, see Chap. 5.3.9.2 . Depending on the
application either the parameter
Divider Synchronization
or the input averaging
has to be selected. A complete acquisition, calculation and output process takes place in
each master clock period, see Chap.
5.6 .
If the master clock period of the controller is larger than the measuring rate of the re-
spective sensor, the previous measured values are used again for the calculation in the
next cycle.
If the master clock period of the controller is smaller than the measuring rate of the re-
spective sensor, sensor values are skipped.
Example Sensor 1 Sensor 2
Type ILD 2200 ILD 1700
Measuring rate 10 kHz 2.5 kHz
Average value 8 2
Master clock 10 kHz
Divider calculation frequency 8
Fig. 21 Setting of the master clock for the calculation and transmission of measured val-
ues with 1250 Hz, continuous
Fields with a grey
background require a
selection.
Value
Dark bordered fields
require the specifica-
tion of a value.