Omron CJ1M-CPU21 User Manual

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ACCELERATION CONTROL: ACC(888) Section 5-8
Note Triangular Control
If the specified number of pulses is less than the number required to reach the
target frequency and return to zero, the function will automatically reduce the
acceleration/deceleration time and perform triangular control (acceleration
and deceleration only.) An error will not occur.
Flags
Example When CIO 000000 turns ON in the following programming example,
ACC(888) starts pulse output from pulse output 0 in continuous mode in the
clockwise direction using the CW/CCW method. Pulse output is accelerated
at a rate of 20 Hz every 4 ms until the target frequency of 500 Hz is reached.
When CIO 000001 turns ON, ACC(888) changes to an acceleration rate of
10 Hz every 4 ms until the target frequency of 1,000 Hz is reached.
Pulse frequency
Target
frequency
Specified number
of pulses
(Specified with
PLS2(887).)
Execution of
PLS2(887)
Time
Name Label Operation
Error Flag ER ON if the specified range for P, M, or S is exceeded.
ON if pulses are being output using ORG(889) for the
specified port.
ON if ACC(888) is executed to switch between indepen-
dent and continuous mode for a port that is outputting
pulses for SPED(885), ACC(888), or PLS2(887).
ON if ACC(888) is executed in an interrupt task when an
instruction controlling pulse output is being executed in a
cyclic task.
ON if ACC(888) is executed for an absolute pulse output
in independent mode but the origin has not been estab-
lished.

Omron CJ1M-CPU21 Specifications

General

CPU Type	CJ1M
Model Number	CJ1M-CPU21
Data Memory Capacity	32K words
Operating Voltage	24 VDC
Operating Temperature	0 to 55 °C
Execution Speed	0.1 μs (basic instructions)
Serial Communication	RS-232C
Expansion Capability	Up to 3 expansion units
Programming Language	Ladder logic, structured text
Built-in I/O Points	No built-in I/O

Summary

PRECAUTIONS

1 Intended Audience

Identifies target personnel for the manual, requiring knowledge of electrical and FA systems.

2 General Precautions

Emphasizes operating products as specified and consulting OMRON for critical applications.

3 Safety Precautions

Crucial warnings about PLC operation, memory modification, and handling electrical components to prevent injury.

4 Operating Environment Precautions

Guidelines on avoiding hazardous locations like direct sunlight, extreme temperatures, or corrosive environments.

5 Application Precautions

Precautions for system setup, grounding, power supply handling, and component mounting during operation.

6 Conformance to EC Directives

Details on compliance with EMC and Low Voltage Directives for safe system integration.

SECTION 1 Features

1-1 Features

Overview of CJ1M CPU Units' high-speed, advanced, micro-sized PLCs with built-in I/O.

1-2 Version Upgrades for CJ1M CPU Units

Details on functional improvements from unit version upgrades for CJ1M CPU Units.

1-3 Functions Listed by Purpose

Categorization of built-in I/O functions based on their specific purpose.

SECTION 2 Overview

2-1 Allocations for Built-in CPU Unit Inputs

Mapping of physical inputs to internal addresses and their functional assignments.

2-2 Allocations for Built-in CPU Unit Outputs

Mapping of physical outputs to internal addresses and their functional assignments.

2-3 Allocations for Origin Search Function

Details on I/O points utilized by the origin search function for pulse outputs.

SECTION 3 I/O Specifications and Wiring

3-1 I/O Specifications

Electrical and functional specifications for built-in inputs and outputs, including voltage and current ratings.

3-2 Wiring

Information on connector pin allocations and wiring methods for system connections.

3-3 Wiring Examples

Practical illustrations of various I/O connection configurations for different devices.

SECTION 4 Data Area Allocation and PLC Setup Settings

4-1 Data Area Allocation for Built-in I/O

Allocation of memory words and bits for built-in I/O usage.

4-2 PLC Setup Settings

Configuration parameters within the PLC for managing built-in I/O functionality.

4-3 Auxiliary Area Data Allocation

Allocation of auxiliary area words and bits related to built-in inputs and outputs.

4-4 Flag Operations during Pulse Output

Explanation of how flags change relative to pulse output operations and timing.

SECTION 5 High-speed Counter/Pulse Output Instructions

5-1 MODE CONTROL: INI(880)

Controls operations for high-speed counters and pulse outputs, including starting/stopping and PV changes.

5-2 HIGH-SPEED COUNTER PV READ: PRV(881)

Reads Present Values (PVs) and status information for high-speed counters and pulse outputs.

5-3 COUNTER FREQUENCY CONVERT: PRV2(883)

Converts pulse frequency to rotational speed or total revolutions.

5-4 REGISTER COMPARISON TABLE: CTBL(882)

Registers comparison tables and performs target or range comparisons for high-speed counter PVs.

5-5 SPEED OUTPUT: SPED(885)

Sets output pulse frequency and starts pulse output without acceleration/deceleration.

5-6 SET PULSES: PULS(886)

Sets the number of output pulses for SPED(885) or ACC(888) in independent mode.

5-7 PULSE OUTPUT: PLS2(887)

Outputs specified pulses with acceleration/deceleration, supporting target changes.

5-8 ACCELERATION CONTROL: ACC(888)

Outputs pulses with specified acceleration/deceleration rates, supporting mode changes.

5-9 ORIGIN SEARCH: ORG(889)

Performs origin search or origin return operations using specified methods and parameters.

5-10 PULSE WITH VARIABLE DUTY FACTOR: PWM(891)

Generates PWM pulse outputs with a specified duty factor and frequency.

SECTION 6 Built-in I/O Function Descriptions

6-1 Built-in Inputs

Detailed description of the types, allocations, and specifications of built-in inputs.

6-2 Built-in Outputs

Detailed description of the types, allocations, and specifications of built-in outputs.

6-3 Origin Search and Origin Return Functions

Detailed explanation of origin search and return operations and their parameters.

SECTION 7 Programming Examples

7-1 Built-in Outputs

Practical examples illustrating the programming of built-in output functions.