Mitsubishi AL2 Series User Manual

α2 Simple Application Controllers
Function Blocks 6
6 - 27
6.13 Compare Block
The function block compares value 1 (V1) with value 2 (V2) using an operational based
instruction based upon the following conditions: =, >, >=, <, <= or <>. If current values satisfy
the operational expression then the output status is ON.
Table 6.13: Compare Function Block
Setup of the Compare Function Block directly from the
α2 Series Controller
1 ) Allocate the input pin to be used for the function block.
2 ) Press the “OK” key with the cursor in the function block. The function block edit screen is
displayed as shown.
3 ) Press the “OK” Key and enter the function block settings using the “ and ” keys.
4 ) Pressing the “OK” key invokes the menu thats lists the function block input data type.
5 ) Press the “OK” Key and a Direct Set value can be entered..
Function Set Item Description
I Input pin for compare operation
FB
The following three set items exist:
1) Compare Value (V1):
a) Constant value set range:-32768 to +32767 with an initial value 0
b) Analogue value set range: A01-A08
c) Output value from a different function block
2) Operational Expression: =, >, >=, <, <=, <>
3) Compare Value (V2):
a) Constant value set range:-32768 to +32767 with an initial value 0
b) Analogue value set range: A01-A08
c) Output value from a different function block
Output
If Compare value (V1) and Compare value (V2) satisfies the
operational expression the status of the output is ON.
000
PC
OI P
B001 : CP
Se t up FB
Change No
De l e t e FB
B001 : CP
Cmp V a l
V1 = V2
0
1
B001 : CP
Di rectS
Ana l og I n
FB Va l ue
et
B001 : CP
Cmp V a l
Di rectSet
0
1

Mitsubishi AL2 Series Specifications

General

Model	AL2 Series
Digital Inputs	Yes
Digital Outputs	Yes
Type	PLC
Manufacturer	Mitsubishi
Input Voltage	100 to 240 VAC or 24 VDC (depending on model)
Output Voltage	24V DC
Number of Inputs	8 to 64 (depending on model)
Number of Outputs	6 to 64 (depending on model)
Programming Language	Ladder Diagram
Communication Ports	RS-232, RS-485, Ethernet (depending on model)
Operating Temperature	0 to +55°C
Storage Temperature	-20°C to 70°C
Humidity	10% to 90% (non-condensing)
Weight	Varies depending on the model

Summary

Foreword

Introduction

Special Features and Model Name

Details special features like display messages, function block data, and model name identification.

Function Block Programming

Block Types and FBD Base

Describes the seven sets of items used in function block programming, including inputs and outputs.

Programming Methods

Introduces direct programming and software-based programming for the controller.

System Menu

Stop Mode Top Menu

Details options available when the controller is in Stop mode, such as Run, Setup TS, and ProgEdit.

Run Mode Top Menu

Describes the Top Menu options accessible when the controller is running, like Stop, Monitor, and ClockSet.

Edit Menu and Function Block Edit Menu

Edit Menu Options

Explains options like ProgSize, Jump, New FB, Exit, and Mnemonic within the Edit Menu.

Function Block Editing Options

Details options for editing function blocks: Setup FB, Change No, and Delete FB.

Direct Programming

Block Availability and Connection

Covers block availability and how to connect blocks in direct programming.

Methods for Creating Function Blocks

Describes creating new function blocks using New FB and AddFB options.

Logic Function Blocks

Overview of Logic Gates

Explains the six types of logic blocks: AND, OR, NOT, XOR, NAND, NOR.

Function Blocks Overview

Basic Function Blocks

Describes Boolean, Set/Reset, Pulse, Alternate, Delay, One Shot, Flicker, Time Switch blocks.

Advanced Function Blocks

Details Counter, Compare, Offset, Display, Zone Compare, Schmitt Trigger, Hour Meter blocks.

Lets Make a Program

Option Settings and Function Block Diagram

Covers initial option settings and the basic function block diagram for programming.

Inputting the Program

Step-by-step guide to adding function blocks and creating a program.

Appendix

Associated Manuals

Lists related manuals for the α2 Series Controller.

System Keys and Bits

Explains system keys and system bits used in the controller.