Omron SYSMAC CP Series, Руководство пользователя

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12-59
12 Pulse Outputs
CP2E CPU Unit Software User’s Manual(W614)
12-10 Precaution
s when
Using
Pulse Outpu
ts
12
12
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Multipoint P
ositioning
12-10Precautions when Using Pulse Outputs
When operating with the absolute pulse specification, the movement direction (CW/CCW) is selected
automatically based on the relationship between the pulse output PV when the instruction is executed
and the specified target position. The direction (CW/CCW) specified in an ACC, SPED or PLS2 instruc-
tion is not effective.
Pulse outputs will stop according to the PLC Setup when either the CW or CCW Limit Input Signals
turns ON. It is also possible to select whether or not the defined origin will be cleared when a CW or
CCW Limit Input Signal turns ON for a pulse output function.
The CP2E CPU Unit ’ s pulse output frequency is determined by dividing the source clock frequency
(15 MHz) by an integer ratio. Consequently, there may be a slight difference between the set frequency
and the actual frequency, and that difference increases as the frequency increases. The actual fre-
quency can be calculated from the following equations.
z
Pulse Output System
z
Equations
Movement Direction when Specifying Absolute Pulses
Using CW/CCW Limit Inputs for Pulse Output Functions other than
Origin Searches
Difference between Set Frequencies and Actual Frequencies
15MHz
Integer dividing r a tio c a lc u l a ted
from us er’ s s et fre qu ency
S o u rce clock Fre qu ency divider
O u tp u t p u l s e s ( a ct ua l fre qu ency)
Act u al fre qu ency (Hz)=
So u rce clock fre qu ency
Di v iding ratio
Di v iding ratio=I N T
So u rce clock fre qu ency × 2 + Set fre qu ency
Set fre qu ency (Hz) × 2
The I N T f u nction extracts an integer from the fraction. The non-integer remainder is ro u nded.