Omron CP1H CPU UNITS - PROGRAMMING 05-2007, Operation Manual

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Pulse Outputs
Section 5-3
■
Change Target Speed and Acceleration/Deceleration Rate during
Acceleration or Deceleration
When trapezoidal acceleration/deceleration is being executed according to a
pulse output instruction (speed control or positioning), the target speed and
acceleration/deceleration rate can be changed during acceleration or deceler-
ation.
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Use Variable Duty Factor Pulse Outputs for Lighting, Power Control, Etc.
The PULSE WITH VARIABLE DUTY FACTOR instruction (PWM(891)) can be
used to output variable duty factor pulses from the CPU Unit's built-in outputs
for applications such as lighting and power control.
Controlling Pulse Outputs
Purpose Function Description
Perform simple posi-
tioning by outputting
pulses to a motor driver
that accepts pulse-train
inputs. Pulse output functions
• Single-phase pulse output without
acceleration/deceleration
Controlled by SPED.
• Single-phase pulse output with
acceleration/deceleration (equal
acceleration and deceleration
rates for trapezoidal form)
Controlled by ACC.
• Single-phase pulse output with
trapezoidal acceleration/decelera-
tion (Supports a startup fre-
quency and different acceleration/
deceleration rates.)
Controlled by PLS2(887).
In X/XA CPU Units, built-in outputs can be used as pulse
outputs 0 to 3.
In Y CPU Units, pulse outputs 0 and 1 can be used as
pulse line-driver outputs and built-in output bits can be
used as pulse outputs 2 and 3.
Target frequency ranges in X/XA CPU Units:
Unit version 1.1 and later:
Pulse outputs 0, 1, 2, 3: 1 Hz to 100 kHz
Unit version 1.0 and earlier:
Pulse outputs 0 and 1: 1 Hz to 100 kHz (1 Hz units)
Pulse outputs 2 and 3: 1 Hz to 30 kHz (1 Hz units)
Target frequency ranges in Y CPU Units:
Pulse outputs 0 and 1: 1 Hz to 1 MHz
Pulse outputs 2 and 3: 1 Hz to 100 kHz
Duty factor: 50%
The pulse output mode can be set to CW/CCW pulse
control or Pulse plus direction control, but the same out-
put mode must be used for pulse outputs 0 and 1.
Note The pulse output PVs are stored in the Auxiliary
Area.
Perform origin search
and origin return opera-
tions. Origin functions (Origin search and
origin return) Origin search and origin return operations can be exe-
cuted through pulse outputs.
• Origin search:
To start the origin search, set the PLC Setup to
enable the origin search operation, set the various
origin search parameters, and execute the ORIGIN
SEARCH instruction (ORG(889)). The Unit will deter-
mine the location of the origin based on the Origin
Proximity Input Signal and Origin Input Signal. The
coordinates of the pulse output's PV will automatically
be set as the absolute coordinates.
• Origin return:
To return to the predetermined origin, set the various
origin return parameters and execute the ORIGIN
SEARCH instruction (ORG(889)).
Change the target posi-
tion during positioning.
(For example, perform
an emergency avoid
operation with the Multi-
ple Start feature.)
Positioning with the PLS2(887)
instruction When a positioning operation started with the PULSE
OUTPUT (PLS2(887)) instruction is in progress, another
PLS2(887) instruction can be executed to change the
target position, target speed, acceleration rate, and
deceleration rate.