Omron CJ1M-CPU21, Operation Manual

Page: 45 / 267

16
Allocations for Origin Search Function Section 2-3
Functions
2-3 Allocations for Origin Search Function
To use the origin search function, enable the origin search function for the
pulse output in the PLC Setup.
The origin search function uses several of the CPU Unit's built-in I/O points in
addition to the pulse outputs, as described below, so these I/O points cannot
be used for other purposes when the origin search function is being used.
• When the origin search function is being used for pulse outputs 0 and 1,
outputs OUT4 and OUT5 are used for the Error Counter Reset Output
and inputs IN0 through IN5 are used for the Origin Input Signals, Origin
Proximity Input Signals, and Positioning Completed Signals. These I/O
points cannot be used for other purposes if the origin search function is
being used, except for the Error Counter Reset Outputs and Positioning
Completed Signals, which are not used in some origin search operating
modes.
The origin return function moves the system to the origin location predeter-
mined by the origin search function or preset pulse output PV.
The origin return function can be used only for the pulse outputs.
Item Specifications
1) General-purpose outputs
(6 outputs)
The CPU Unit's built-in outputs (bits
00 to 05 of CIO 2961) can be used as
general-purpose outputs. Note The outputs can be refreshed
immediately with the immedi-
ate refreshing variation (! pre-
fix) of instructions such as
OUT.
2) Fixed
duty ratio
pulse out-
puts
(2 outputs)
• Pulse output without
acceleration/deceleration
(using SPED(885) instruc-
tion)
• Pulse output with trape-
zoidal acceleration/decel-
eration; same rate for
acceleration/deceleration
(using ACC(888) instruc-
tion)
• Pulse output with acceler-
ation/deceleration; differ-
ent rates for acceleration/
deceleration and non-zero
starting frequency (using
PLS2(887) instruction)
The CPU Unit's built-in outputs (bits
00 to 03 of CIO 2961) can be used as
pulse outputs 0 and 1.
Target frequency: 0 Hz to 100 kHz
Duty ratio: 50%
The pulse output method can be set
to CW/CCW outputs or pulse + direc-
tion outputs in the instruction oper-
ands.
Note 1:
The PV for pulse output 0 is stored in
A276 and A277. The PV for pulse
output 1 is stored in A278 and A279.
Note 2:
The PLS2(887) instruction can be
executed during positioning to
change the target position. (Multiple
start)
Note 3:
The PLS2(887) instruction can be
executed during speed control to per-
form positioning to change the target
position.
(Fixed distance feed interrupt)
3) Variable duty ratio pulse outputs
(CJ1M-CPU22/23: 2 outputs, CJ1M-
CPU21: 1 output)
The PWM(891) instruction can be executed to use the CPU Unit's built-in out-
puts (bits 04 and 05 of CIO 2961) as PWM(891) outputs 0 and 1.