PS_PackML_StateMachine_Maintenance

The function blocks for Packaging Machine State have a common interface to the PackML Machine State Model V3 in the updated form. It is expected that application-specific logic, such as state transitions, is programmed in external function blocks and that the Pack_ML_State_Machine function block handles the central logic of the state machine and the state representation. For that reason there is a recommendation for this function block with regard to how it can be combined with other logic.

The logic for transitions, especially between manual, semi-automatic and automatic modes (see figure), depends on the application.

Inputs

VAR_INPUT
    Start           : BOOL;  
    Hold            : BOOL; 
    unHold          : BOOL; 
    Suspend         : BOOL; 
    unSuspend       : BOOL; 
    Abort           : BOOL; 
    Stop            : BOOL; 
    Complete        : BOOL; 
    Clear           : BOOL; 
    Reset           : BOOL; 
    StateComplete   : BOOL; 
END_VAR

Table/description: Execute state machine from rising edge...

Name	Type	Description
Start	BOOL	…to Starting.
Hold	BOOL	…to Holding or Held.
unHold	BOOL	…to Unholding.
Suspend	BOOL	...to Suspending or Suspend.
unSuspend	BOOL	…to Unsuspending.
Abort	BOOL	…to Aborting.
Stop	BOOL	…to Stopping.
Complete	BOOL	…to Resetting.
Clear	BOOL	…to Clearing.
Reset	BOOL	…to Resetting.
StateComplete	BOOL	Transition

Outputs

VAR_OUTPUT
    Status          : WORD; 
    ST_Starting     : BOOL; 
    ST_Completing   : BOOL; 
    ST_Resetting    : BOOL; 
    ST_Holding      : BOOL; 
    ST_UnHolding    : BOOL; 
    ST_Suspending   : BOOL; 
    ST_UnSuspending : BOOL; 
    ST_Clearing     : BOOL; 
    ST_Stopping     : BOOL; 
    ST_Aborting     : BOOL; 
    ST_Execute      : BOOL; 
    ST_Complete     : BOOL; 
    ST_Idle         : BOOL; 
    ST_Held         : BOOL; 
    ST_Suspended    : BOOL; 
    ST_Stopped      : BOOL; 
    ST_Aborted      : BOOL; 
    Error           : BOOL; 
    ErrorID         : UDINT; 
    ePMLState       : E_PMLState;
END_VAR

Name	Type	Description
State	WORD	Status word representing the state of the state machine.
ST_Starting	BOOL	True if state machine is in Starting state.
ST_Completing	BOOL	True if state machine is in Completing state.
ST_Resetting	BOOL	True if state machine is in Resetting state.
ST_Holding	BOOL	True if state machine is in Holding state.
ST_UnHolding	BOOL	True if state machine is in Unholding state.
ST_Suspending	BOOL	True if state machine is in Suspending state.
ST_UnSuspending	BOOL	True if state machine is in Unsuspending state.
ST_Clearing	BOOL	True if state machine is in Clearing state.
ST_Stopping	BOOL	True if state machine is in Stopping state.
ST_Aborting	BOOL	True if state machine is in Aborting state.
ST_Execute	BOOL	True if state machine is in Execute state.
ST_Complete	BOOL	True if state machine in Complete state.
ST_Idle	BOOL	True if state machine is in Idle state.
ST_Held	BOOL	True if state machine in Held state.
ST_Suspended	BOOL	True if state machine is in Suspended state.
ST_Stopped	BOOL	True if state machine is in Stopped state.
ST_Aborted	BOOL	True if state machine is in Aborted state.
Error	BOOL	Becomes TRUE, as soon as an error occurs.
ErrorID	UDINT	If the error output is set, this parameter supplies the error number.
ePMLState	E_PMLState	Current PML state of the automatic state machine.

Requirements

Development environment	Target system type	PLC libraries to be linked
TwinCAT v3.1, build 4018 onwards	PC (i386)	Tc3_PackML