LuaPLC

• Index

Contents

• Functions
• Fields

Modules

• BinArray
• Bit
• CAN
• ExtendedPulseTimer
• GPIO
• IEC60870_5_104_Master
• IEC60870_5_104_Slave
• IOCards
• LuaSQLiteApplication
• ModbusMaster
• ModbusSlave
• MqttApplication
• OffDelayTimer
• OnDelayTimer
• PulseTimer
• Queue
• SerialPort
• Snap7Client
• Stopwatch
• Tag
• Thread
• Timer

Module Tag

The class that creates, modifies and uses tags.

Info:

• Copyright: Debaru Kft. 2017
• Release:
• License: GNU
• Author: Debaru Kft

Functions

Tag ()	Creates a Tag.
set_value_with_time (value, sec, usec)	Sets the value and time at the same time
timestamped_value ()	Gets the value and timestamp of the variable
changed ()	Returns true, if the value of the variable has changed since last call.
init (value)	Sets the initial value of the variable
label (label)	Adds a new label to the variable's label list
name (name)	Sets the name of the variable
name (unit)	Sets the unit name of the variable
persistent ()	Enables the persistance of the variable
get (name)	Gets the tag by its name

Fields

value	Represents the value of the variable tag as a double
bvalue	Represents the value of the variable tag as a boolean

Functions

Tag ()

Creates a Tag.

set_value_with_time (value, sec, usec)

Sets the value and time at the same time

Parameters:

• value double
• sec long
• usec int

Usage:

Variable = Tag():name("TestVar")
Variable:set_value_with_time(123,3600,1000)

timestamped_value ()

Gets the value and timestamp of the variable

Returns:

• value: double (default: 0)
• sec: double (default: 0)
• usec: double (default: 0)

changed ()

Returns true, if the value of the variable has changed since last call. After value initialization it will return false.

Returns:

bool (default: false)

init (value)

Sets the initial value of the variable

Parameters:

• value double

label (label)

Adds a new label to the variable's label list

Parameters:

• label string

name (name)

Sets the name of the variable

Parameters:

• name string

name (unit)

Sets the unit name of the variable

Parameters:

• unit string

persistent ()

Enables the persistance of the variable

get (name)

Gets the tag by its name

Parameters:

• name string

Fields

value

Represents the value of the variable tag as a double

• type double (default: 0)

bvalue

Represents the value of the variable tag as a boolean

• type bool (default: false)