ALPHA2 QUICK START MANUAL

16

Logic

Block

State

Logic Block

Displayed

Description

Memory

Use

Offset

Gain

[OG]

0 0

0

G

O

I

P

The Offset Gain Function Block is based

upon a linear function Y=A/B*X+C to which

the value obtained from an analog input

(X:A01-A08) is set.

22 Byte

Display

[DP]

0 0

0

P

D

I

P

The Display Function Block is used as an

interface between the user and the devices

held within the controller. Current values, timer

messages, user-defined messages can be

read.

*4

Zone

Compare

[ZC]

0 0

0

C

Z

O

I

P

The Zone Compare Function Block identifies

whether the input value lies within a specified

upper and lower limited zonal area and if so

changes the status of the output accordingly.

20 Byte

Schmitt

Trigger

[ST]

0 0

0

T

S

O

I

P

The Schmitt Trigger Function Block compares

an input value to preset high and low limits.

The output is ON when the input value

reaches the high limit and then falls below the

lower limit. The function only processes the

data when the function block is receiving an

input signal.

19 Byte

Hour

Meter

[HM]

0 0

0

M

H

O

I

C

P

The Hour Meter Function Block holds the

output status ON for a maximum of 32767

hours, 59 minutes and 59 seconds. If the input

pin is turned OFF the elapsed time will hold its

value until either the clear pin resets the time

or the input pin is turned ON again.

19 Byte

Speed

Detect

[SPD]

0 0

0

P

S

O

U

C

I

D

P

The Speed Detect Function Block is used to

count the incoming pulses max. 20Hz for a set

period of time. The upper and lower limits can

be set from -32768 to +32767 and the Period

interval’s set range is 1 to 32767 in 10ms

increments.

25 Byte

PWM

[PWM]

0 0

0

W

P

O

I

M

P

The Pulse Width Modulation Function Block

changes the output status according to a set

period of time with a minimum of 100ms and

a maximum of 3276700ms in increments of

100ms. The percentage duty for the function

controls the amount of elapsed time before the

output status is changed.

16 Byte

PID

0

I

P

O

A

C

E

D

P

0 0

The PID Function Block is the Alpha2

implementation of PID, a control method used

to obtain stable control over a system variable.

It is a equipped with an Autotuning function,

which automatically adjusts the Function Block

parameters for the specific application.

52 Byte

Reten-

tive

Alternate

[RAL]

0 0

0

L

A

I

C

R

The Alternate Function Block is used to

reverse the ON and OFF state of the output as

and when the input pin receives a signal. The

output will be set ON when the input pin goes

high and remain ON until the input receives

the second rising edge. When the power is

turned OFF the function block will use the last

alternation operation to control the output.

13 Byte

Addition

[ADD]

0 0

0

D

A

O

I

D

P

The ADD Function Block is used to summate

two input values

20 Byte

Subtrac-

tion

[SUB]

0 0

0

U

S

O

I

B

P

The SUB Function Block is used to subtract

two input values.

20 Byte

Multipli-

cation

[MUL]

0 0

0

U

M

O

I

L

P

The MUL Function Block is used to multiply

two input values.

20 Byte

Division

[DIV]

0 0

0

I

D

O

I

V

P

The DIV Function Block is used to divide

two input values.

20 Byte

Logic

Block

State

Logic Block

Displayed

Description

Memory

Use

Calcula-

tion

[CAL]

0 0

0

A

C

O

I

L

P

The CAL Function Block is used to perform a

calculation from the combination of different

Arithmetic function blocks.

*3

Shift

[SFT]

0 0

0

I

T

S

O

T

S

R

F

This Shift Function Block is used to transfer

the Shift Input status just before the Input

signal is set ON. It has a bit input pin, a shift

input pin, a set input pin, a reset input pin and

a bit output pin.

19 Byte

Random

One

Shot

[ROS]

0 0

0

O

R

O

I

S

C

P

The Random One Shot Function Block emits a

random length single pulse to the output.

19 Byte

Delayed

One

Shot

[DOS]

0 0

0

O

D

O

I

S

C

P

The Delayed One Shot Function Block emits

a single pulse after a controlled delay to the

output.

20 Byte

Delayed

Alternate

[DAL]

0 0

0

A

D

O

I

L

C

P

The Delayed Alternate Function Block

alternates the status of the output with each

pulse after a controlled delay.

16 Byte

Reten-

tive Set/

Reset

[RSR]

0 0

0

S

R

S

R

R

P

The Set/Reset Function Block either holds an

output ON (set) or releases the output OFF

(reset.) Priority can be given to either input

pin if both inputs have been energized. The

default priority setting is dedicated to the reset

input pin. When the power is turned OFF the

function block will use the last set or reset

operation to control the output.

14 Byte

Control

Display

[CDP]

The Control Display Function allows the user

to control the LCD image screens. The func-

tion block can only be set in AL-PCS software

for Alpha2 Series Controllers. When control

bit N04 is ON, it is possible to control the

displayed User Screen.

*5

Connect

[ _B ]

0

0

B

_

O

I

0

The Connect function block is an internal

device used to show the memory used by

input bits, system bits, AS-interface bits, and

the operation keys. No function block appears

on screen or is shown as being used in the

“Memory Configuration Usage” dialog box. The

purpose is only to calculate the memory that is

used by the bits listed above.

10 Byte

System

Outputs

Control for external devices through relays and

transistors.

10 Byte

1. Number of bytes used = 19 + 1 x (Characters in equation)

2. Number of bytes used = 8 + 4 x (Number of time switches)

3. Number of bytes used = 30 + 1 x (Characters in equation)

4. Number of bytes used is decided by the displayed item.

Displayed Item

Number of Bytes, Alpha2 Series

Characters

16 + 1 x (Each character displayed)

Analog, FB Value

Value

17

Graph

23

Time, Date

14

Time Switch

17

5. Number of bytes used = 32 + 3 x (Number of screen)

6. Number of bytes used = 12 + 1 x (Characters in E-Mail address)

7. Number of bytes used = 37 + (Number of characters of setup commands)

Mitsubishi Electric Automation, Inc.