Mitsubishi MELSEC A1SX80-S1 User Manual

'PROGRAMMING
41
Termination instructions
FEND
Main routine program termination (FEND)
The FEND instruction terminates the main routine program. When the FEND
instruction is executed, the
PLC returns to step 0 after completion of the timerkounter
processing, self diagnostic processing etc. and resumes operation from step
0. The
sequence program located after the FEND instruction can be used for sub routines and
interrupt programs which are called up from the main routine program.
An example of the FEND instruction used in conjunction with a conditional jump
instruction is shown on the following page
i
' <- When ladder is displayed this I
instruction is not shown
Sequence program termination (END)
The END instruction indicates the end
of program. At this step the scan returns to step
0. The END instruction cannot be used midway through a sequence program or sub
sequence program. If END processing is necessary halfway through the program, use
the FEND instruction.
If the END instruction is not given in the program, operation error
occurs and the
PLC does not run.
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Mitsubishi MELSEC A1SX80-S1 Specifications

General

Brand	Mitsubishi
Model	MELSEC A1SX80-S1
Category	Controller
Language	English

Summary

Chapter 2: AIS Module Descriptions

CPU Module

Details the central processing unit (CPU Module) which is the main part of the AIS PLC system and controls I/O points.

CPU Base Units

Power supply modules

Details power supply modules that provide 5 VDC required by CPU and I/O modules, listing available models.

Input modules

Output modules

Special function modules

Chapter 3: System Selection and Configuration

System selection

Guides users through a five-step process to select AIS PLC components matching application requirements.

Step 1: Input module selection

Provides a flowchart for selecting the appropriate input module based on voltage, point count, and type.

Step 2: Output module selection

Offers a flowchart to guide the selection of output modules based on type, point count, current, and commons.

Step 3: Special function module selection

Presents a flowchart for choosing special function modules based on application needs like A/D conversion or networking.

Step 4: Power supply module selection

Details the selection process for power supply modules based on DC 24V input or output requirements.

Step 5: Base unit selection

Guides the selection of base units by calculating required I/O slots and considering power supply capacity.

System configuration

Explains how to allocate modules to I/O slots and assign input/output numbers for system programming.

A1S System Examples

Chapter 4: Installation

Base unit mounting instructions

Installation and removal of AIS modules

Details the procedure for installing and removing AIS modules onto and from the base unit, with power supply OFF.

Chapter 6: Programming

Description of internal devices

Introduces internal devices used in sequence programs, such as relays, timers, counters, and registers.

Programming language

Numeric value and character representation

Instructions

Classifies and lists instructions into sequence, basic, and application groups for programming the AIS PLC.

List of sequence instructions

Provides a comprehensive list of sequence instructions with their symbols, contents, and execution conditions.

List of basic instructions

Lists basic instructions, primarily for numeric data handling and comparisons, with their symbols and functions.

List of application instructions

Categorizes and lists application instructions for special processing tasks, such as logical operations and data transfer.

Sequence instruction description

Output instructions

Bit device set, reset (SET, RST)

Master control instructions

Arithmetic operation instructions

Details arithmetic instructions for BIN and BCD data, covering addition, subtraction, multiplication, and division.

BCD/BIN conversion instructions

Explains instructions for converting data between BCD and BIN formats, crucial for data representation.

Data transfer instructions