Omron CJ1M-CPU21 User Manual

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Built-in Inputs Section 6-1
Procedure
1,2,3... 1. High-speed Counter Enable/Disable Setting (Required)
Set the High-speed Counter 0 Enable/Disable setting to 1 or 2 (use high-
speed counter) in the PLC Setup.
2. Pulse Input Mode Setting (Required)
Set the High-speed Counter 0 Pulse Input Mode in the PLC Setup.
3. Counting Mode Setting (Required)
Set the High-speed Counter 0 Counting Mode in the PLC Setup.
If ring mode counting is selected, set the High-speed Counter 0 Ring
Counter Maximum Value (max. ring count) in the PLC Setup.
4. Reset Method Setting (Required)
Set the High-speed Counter 0 Reset Method in the PLC Setup.
5. Execute PRV2 as described below (required).
Converting the Frequency to a Rotational Speed
Execute PRV2 with the following operands.
C: Control data (Set to #0000 for frequency-rotational speed conversion.)
P: Pulses/rotation (hex)
D: First word for result
Converting the Counter PV to the Total Number of Rotations
Execute PRV2 with the following operands.
C: Control data (Set to #0001 for counter PV-total number of rotations con-
version.)
P: Pulses/rotation (hex)
D: First word for result
Restrictions Pulse frequency conversion is possible only for high-speed counter 0.
6-1-5 Quick-response Inputs
Overview
The quick-response inputs read pulses with an ON time shorter than the cycle
time (as short as 30
µs). Use the quick-response inputs to read signals such
as inputs from a photomicrosensor.
Procedure
Select quick-response inputs.
Wire inputs.
PLC Setup settings
• IN0 to IN3 (CIO 2960 bits 00 to 03)
• Connect to the selected terminals
between IN0 and IN3.
• When IN0 to IN3 are used as quick response inputs,
make the necessary "input operation settings" for
IN0 to IN3 in Programming Console address 60.
IN0: Set the rightmost digit (bits 00 to 03) to 2 Hex.
IN1: Set the second digit (bits 04 to 07) to 2 Hex.
IN2: Set the third digit (bits 08 to 11) to 2 Hex.
IN3: Set the leftmost digit (bits 12 to 15) to 2 Hex.
• Use the quick-response inputs in
instructions such as LD.
Ladder program

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.