Mitsubishi L02CPU User Manual

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5.9.2 Common pointer
The common pointer is used to call subroutine programs from all programs that are being executed.
To set the common pointer range, enter the start number of the common pointer. The common pointer range is from
the specified pointer number to P4095. However, the pointer number that can be entered here is a number greater
than the total points used for the local pointer.
Project window [Parameter] [PLC Parameter] [PLC System]
If a total of 400 points are used in three programs (100 points in each of Program A and Program B, and 200
points in Program C), for example, P400 and higher numbers can be set for the common pointer.
● The same pointer number cannot be used as a label. If used, "CAN'T SET(P)" (error code: 4021) occurs.
● If the total number of the local pointer points used in several programs exceeds the start number of the common pointer,
a "CAN'T SET (P)" (error code: 4020) occurs.
● The jump instructions are not capable of executing a jump to the common pointer in other programs. Use the common
pointer with subroutine call instructions only.
Program A Program C
Program B
Label
Set the start number for
the common pointer.
Ex.
Ex.
100 points of P0 to
P99 occupied
100 points of P0 to
P99 occupied
200 points of P0 to
P199 occupied
Program A Program B Program C
Total of 400 points
are used.
Using P0 to P99 Using P0 to P99 Using P0 to P199
P400 and higher numbers can be
used for the common pointer.

Mitsubishi L02CPU Specifications

General

Brand	Mitsubishi
Model	L02CPU
Category	Controller
Language	English

Summary

MITSUBISHI MELSEC-L CPU Module User's Manual

SAFETY PRECAUTIONS

Design Precautions

Essential safety guidelines for designing systems with the controller, covering circuits and operations.

Installation Precautions

Crucial steps for safely installing the programmable controller modules, including environment and interconnection.

Wiring Precautions

Important safety measures for correctly wiring the controller, covering grounding, terminals, and cable routing.

Startup and Maintenance Precautions

Precautions for safe startup, operation, and maintenance procedures, including handling batteries and static electricity.

PART 1 PROGRAMMING

CHAPTER 1 BASIC PROCEDURE FOR PROGRAMMING

Guides through the fundamental steps of PLC programming.

CHAPTER 1 BASIC PROCEDURE FOR PROGRAMMING

1.2 Creating a Project

1.3 Creating a Program

Explains the fundamental steps and prerequisites for program creation.

1.4 Converting a Program

1.5 Writing a Project to the CPU Module

Describes how to transfer the project, including memory formatting.

1.6 Checking an Operation of the CPU Module

Outlines procedures for verifying the CPU module's operation after programming.

CHAPTER 3 CPU MODULE FUNCTIONS

3.2 Constant Scan

3.3 Watchdog Timer (WDT)

Details the watchdog timer for detecting hardware failures and program errors.

3.4 Latch Function

3.5 Initial Device Value

3.11 File Password 32

Explains how to protect files stored in the CPU module with passwords.

3.13 Remote Operation

Details methods for controlling CPU module operations remotely.

3.17 Local Device Monitor/Test

3.19 Executional Conditioned Device Test

3.20 Sampling Trace

3.21 Writing Programs in RUN Status

Describes online program changes while the CPU module is running.

3.23 Self-Diagnostic Function

Covers the CPU module's self-diagnostic capabilities for error detection.

3.24 Error Clear

Explains how to clear detected continuation errors by type.

3.27 Latch Data Backup to Standard ROM

3.30 CPU Module Change Function with SD Memory Card

Explains data backup and restoration using an SD memory card for module replacement.

Appendix 1 Parameter Setting

Appendix 1.2 PLC Parameter

Details various PLC parameter settings including name, system, file, RAS, boot, and program.

Appendix 1.4 Remote Password setting

Provides screens and details for setting remote passwords for access control.

Appendix 1.2 PLC Parameter

2. PLC System Setting

Configures system-level parameters for CPU module operation.

3. PLC File Setting

4. PLC RAS Setting

Configures Reliability, Availability, and Serviceability (RAS) functions.

5. Boot File Setting

6. Program Setting

8. Device Setting

9. I/O Assignment Setting

Configures the connecting status and assignments of modules in the system.

11. Built-in Ethernet Port Setting

12. Built-in I/O Function Setting