Omron CJ1M-CPU21, Operation Manual

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Built-in Outputs Section 6-2
Specifications
6-2-3 Pulse Outputs
Overview
The pulse output function outputs fixed duty ratio (duty ratio: 50%) pulse sig-
nals from the built-in output terminals.
Both speed control (outputting pulses continuously at specified frequencies)
and positioning (outputting a specified number of pulses) are supported.
The pulse output functions are controlled by executing Pulse Output Instruc-
tions from the ladder program. In some cases, the instructions require PLC
Setup settings to be made in advance.
The following table shows the instructions that can perform position control
and speed control.
The CJ1M CPU Unit's pulse output functions have some features that are dif-
ferent from the earlier CPU Unit models. The differences are listed below.
• The target position can be changed during positioning (multiple start func-
tion). When a PLS2(887) instruction is being executed, another
PLS2(887) instruction can be executed with a different target position.
• Operation can be switched from continuous speed control at a certain tar-
get frequency to positioning with a specified number of pulses to move a
certain distance. When an ACC(888) instruction (continuous mode) is
being executed, a PLS2(887) instruction can be executed to switch to
positioning.
• When positioning by specifying absolute pulses, the CW/CCW direction
can be selected automatically. The pulse output's CW/CCW direction will
be selected automatically (based on the specified number of pulses and
the pulse output PV) when a pulse output operation is executed with
SPED(885), ACC(888), or PLS2(887) under the following conditions:
1. The origin location has been determined by performing an origin
search or setting the pulse output PV with INI(880).
2. The absolute number of pulses is specified with PULS(886) or
PLS2(887).
Item Specifications
Number of outputs 6 outputs
Allocated data area CIO 2961 bits 00 to 05
Instruction name Mnemonic Function
code
Primary use
SET PULSES PULS 886 Setting the number of pulses for
pulse output
SPEED OUTPUT SPED 885 Pulse output without acceleration or
deceleration.
ACCELERATION
CONTROL ACC 888 Pulse output with acceleration and
deceleration
PULSE OUTPUT PLS2 887 Trapezoidal control
ORIGIN SEARCH ORG 889 Origin search and origin return
MODE CONTROL INI 880 Stopping pulse output or changing
PVs
HIGH-SPEED
COUNTER PV
READ PRV 881 Reading PVs