12-10Precautions When Using Pulse Outputs - Omron SYSMAC CP Series User Manual

12-10Precautions when Using Pulse Outputs

Movement Direction when Specifying Absolute Pulses
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.
Using CW/CCW Limit Inputs for Pulse Output Functions other than
Origin Searches
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.
Difference between Set Frequencies and Actual Frequencies
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.
Pulse Output System
Source clock
Equations
Actual frequency (Hz)=
Dividing ratio=INT
The INT function extracts an integer from the fraction. The non-integer remainder is rounded.
CP2E CPU Unit Software User's Manual(W614)
Integer dividing ratio calculated
from user's set frequency
Output pulses (actual frequency)
Frequency divider
15MHz
Source clock frequency
Dividing ratio
Source clock frequency × 2 + Set frequency
Set frequency (Hz) × 2
12 Pulse Outputs
12-59
12