ALPHA2 QUICK START MANUAL

15

n

HOW TO USE HELP

Gives detailed information on “How to Use Help” and Customize

the Help settings for the users convenience. Topics include finding,

copying, viewing, and printing help files and manipulating the data in

dialog boxes. Learn how to change the color or font size of a dialog

box, add comments, or bookmark especially useful information.

9. FUNCTION BLOCKS

9.1 LOGIC FUNCTION BLOCKS

• Logic Function Blocks operate by reading whether signals are ON or

OFF and then setting the status of their Outputs accordingly.

• There are six types of logic blocks available in the Alpha2 Series -

AND, OR, NAND, NOT, NOR, XOR.

• Analog signals cannot be processed by the Logic blocks.

• The logic FB have no parameters.

Boolean Logic Function Blocks

Logic

Block

State

Logic Block

Displayed

Description

Memory

Use

AND

00

AND

2

3

O

4

1

This function executes logical AND operation on

given input signals. The input signals connected

should be of bit input type only. 4 Bit input pins

and 1 Bit output pin. If all the inputs are ON then

the output is ON, otherwise output is OFF.

19 Byte

OR

00

OR

2

3

O

4

1

This function executes logical OR operation on

given input signals. The input signals connected

should be of bit input type only. 4 Bit input pins

and 1 Bit output pin. If all the inputs are OFF

then output is OFF, otherwise output is ON.

19 Byte

NOT

00

NT

1

O

This function executes logical NOT operation on

given input signal. The input signal connected

should be of bit input type only. 1 Bit input pin

and 1 Bit output pin. Output is negation of Input

given.

10 Byte

XOR

00

XOR

1

2

O

This function executes logical XOR operation on

given input signals. The input signals connected

should be of bit input type only. 2 Bit input pins

and 1 Bit output pin. If both inputs are either

OFF or ON then out put is OFF, otherwise

output is ON.

13 Byte

NAND

00

NAND

2

3

O

4

This function executes logical NAND operation

on given input signals. The input signals

connected should be of bit input type only. 4 Bit

input pins and 1 Bit output pin. If all the inputs

are ON then output is OFF, otherwise output

is ON.

19 Byte

NOR

00

NOR

2

3

O

4

1

This function executes logical NOR operation on

given input signals. The input signals connected

should be of bit input type only. 4 Bit input pins

and 1 Bit output pin. If all the inputs are OFF

then out put is ON, otherwise output is OFF.

19 Byte

9.2 ADDITIONAL FUNCTION BLOCKS

The Alpha2 series controller is fundamentally based on function block

programming. The blocks provide a wide range of possible operations

and have been preprogrammed for ease of use. Some Function Blocks

have parameters that can be tailored to meet individual requirements in

the programs.

Logic

Block

State

Logic Block

Displayed

Description

Memory

Use

Boolean

[BL]

0 0

0

1

L

B

O

2

3

4

P

The Boolean Function Block uses Boolean

algebra to control the ON/OFF state of an

output. An operational expression consists of

either the AND, OR, XOR or NOT form.

*1

Set/

Reset

[SR]

0 0

0

R

S

O

S

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

simultaneously. The default priority setting is

dedicated to the reset input pin.

14 Byte

Pulse

[PL]

0 0

0

L

P

O

I

P

The Pulse Function Block sends a single pulse

to the output pin if the input pin receives either

an “ON to OFF”, “OFF to ON” or “ON to OFF”

And OFF to ON” input operation.

10 Byte

Alternate

[AL]

0 0

0

L

A

O

I

C

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.

13 Byte

Delay

[DL]

0 0

0

L

D

O

I

C

P

The Delay Function Block provides an ON

delay timer and an OFF delay timer. Time

intervals for either situation can be set. The

time unit can be set to 10ms, 100ms or 1s

increments.

19 Byte

One

Shot

[OS]

0 0

0

S

O

O

I

C

P

The One Shot Function Block awaits a signal

supplied to the input pin thereafter setting the

output according to the specified time. The

timing parameters control the state of the

output (depending on the priority setting). The

time unit can be set to 10ms, 100ms or 1s

increments.

17 Byte

Flicker

[FL]

0 0

0

L

F

O

I

P

The Flicker Function Block changes the ON

and OFF state of the output according to a

preset flicker time. The time unit can be set to

10ms, 100ms or 1s increments.

19 Byte

Time

Switch

[TS]

0 0

0

S

T

O

P

The Time Switch Function Block uses a

predefined time schedule to control the ON

and OFF status of the output.

*2

Time

Switch m

[TSm]

0 0

0

S

T m

P

The Time Switch maintenance Function Block

uses a predefined time schedule to control

the ON and OFF status of the output. The

function block can be setup from the TopMenu

“Parameter” via the front panel keys.

*2

Counter

[CN]

0 0

0

N

C

O

I

C

P

The Counter Function Block increments the

current value by one as and when the input

pin receives a signal. When the current value

reaches the set value the output is set ON.

The counter current value is reset as and

when the clear pin receives an input.

16 Byte

U/D

Counter

[UD]

0 0

0

U

D

U

O

D

C

P

P

The Up/Down Function block positively or neg-

atively increments the counter until a set value

is reached thereby setting the output ON. A

preset signal can also equal the set value

regardless of the current value for the function

block and thereby setting the output ON.

22 Byte

Compare

[CP]

0 0

0

P

C

O

I

P

The Compare Function Block monitors the

current value of the input pin in relation to a

preset expression. The expression consists of

=, >, >=, <, <= or <>. If the compared value

satisfies the expression subsequently the

output pin is set on.

17 Byte

Mitsubishi Electric Automation, Inc.