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Introduction To NA System Variables


 
The following NA System Variables will be available for the user: These can be accessed within NA project like any other GLOBAL VARIABLE.

  

System Variable Name

Description

Data Type

Read Only?

_HMI_Brightness

The current backlight brightness.  This is a control variable, so setting it to a valid value will cause the current backlight brightness to be changed.

Integer

Read-Write

_HMI_IsScreenSaverActive

Whether the screen saver is active.  The ActivateScreenSaver action has to be used to make the screen saver active.

Boolean

Read-Write

_HMI_DateTime

The current local time, read from the internal clock.  The SetDateTime action has to be used to adjust the time.

Date

Read-Only

_HMI_CanEjectSDCard

Whether the power for SD memory card is currently supplied.  To remove the SD memory card, the EjectSDMemory action has to be used.

Boolean

Read-Only

 

_HMI_RunSignal

Whether HMI is operating normally. The value of this variable should be toggled periodically while HMI is normal. Even when displaying any menu or a message box, this variable should be toggled.

Boolean

Read-Only

_HMI_IsPageSwitching

Whether the page is being switched. When switching a page, this variable should be turned ‘ON’. After the operation is complete, this variable should be turned ‘OFF’.

Boolean

Read-Only

_HMI_IsDataInput

 Whether any data input object on page is being used to enter data. When any data input object on page has a focus for data input, this variable should be turned ‘ON’, otherwise it should be turned ‘OFF’.

Boolean

Read-Only

_HMI_IsBatteryLow

The HMI internal battery voltage state. When the voltage level is below the warning threshold, this variable should be turned ‘ON’, otherwise it should be turned ‘OFF’.

Boolean

Read-Only

_HMI_CurrentPage

The name of the currently displayed page.

This is a control variable – setting it to a valid page will cause the displayed page to be changed. Invalid page names will be ignored.

String

Read-Write

_HMI_Millisecond

Milliseconds, based on the system clock value.

Integer

Read-Only

_HMI_Second

Seconds, based on the system clock value.

Integer

Read-Only

_HMI_Minute

Minutes, based on the system clock value.

Integer

Read-Only

_HMI_Hour

Hours, based on the system clock value.

Integer

Read-Only

_HMI_RAMTotal

The amount of RAM in the NA

Integer

Read-Only

_HMI_RAMInUse

The amount of RAM currently in use in the NA

Integer

Read-Only

_HMI_ManagedRAMInUse

The amount of Managed RAM in use the NA

Integer

Read-Only

 

Alarm Variables

System Variable Name

Description

Data Type

Read Only?

_HMI_AlarmCount

Total number of alarms raised since the beginning of the current runtime session

Integer

Read-Only

_HMI_AlarmsRaised

Total number of alarms currently in the raised state

Integer

Read-Only

_HMI_AlarmsNotAck

Total number of alarms currently requiring acknowledgement (whether raised or cleared)

Integer

Read-Only

_HMI_AlarmsRaisedNotAck

Number of currently raised alarms requiring acknowledgement

Integer

Read-Only

_HMI_AlarmsClearedNotAck

Number of alarms cleared but still requiring acknowledgement

Integer

Read-Only

 

Security Variables:

System Variable Name

Description

Data Type

Read Only?

_HMI_CurrentUserName

Contains the name of the currently logged in user.

String

Read-Only

_HMI_CurrentUserRole

Contains the security role of the currently logged in user (e.g. Administrator)

String

Read-Only

 

See Also:

Introduction to the NA series HMI




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Created 2014-06-30
Modified 2015-04-08
Views 5896

 

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