Mitsubishi L02CPU User Manual

276
6.3 Real Number (E)
he real number (E) is a device used to specify real numbers in programs. In programs, specify it as E (example:
E1.234).( Page 303, Appendix 1.3)
(1) Specification range
(a) Real number setting range
• For single-precision floating-point data
-2
128
< Device -2
-126
, 0, 2
-126
Device < 2
128
• For double-precision floating-point data
*1
-2
1024
< Device -2
-1022
, 0, 2
-1022
Device < 2
1024
*1 Up to 15 digits can be entered in a programming tool.
(b) When an overflow or underflow has occurred
(c) When a special value
*1
is input
If operation is performed with input data that contains a special value, "OPERATION ERROR" (error
code:4140) occurs.
*1 The special values are -0, unnormalized numbers, nonnumeric characters, and ±∞.
(2) Specification method
Real numbers can be specified in programs by the following expressions.
• Normal expression: A numeric value can be specified as it is.
10.2345 can be specified as E10.2345.
• Exponential expression: A numeric value is specified by (Value) × 10
n
.
1234 is specified as E1.234 + 3.
*1
*1 + 3 represents 10
3
in E1.234 + 3.
6.4 Character String (" ")
The character string is a device used to specify a character string in program. Characters enclosed in quotation marks
are specified. Alphabets are case-sensitive. A string from the specified character to the NUL code (00
H
) is one unit.
Note that, however, up to 32 characters can be specified for an instruction using a character string, such as $MOV.
Overflow Underflow
OPERATION ERROR (error code: 4141) Turned to 0 without any error
Ex.
Ex.
Ex.
Ex.

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