Redundance16

Redundancy16 (FB)

FUNCTION_BLOCK Redundancy16

Short description

Redundant control of 0 - 16 identical devices Influencing factors: demands, operating hours, operating and fault states Typical application: determination of leader and follower devices

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
wTotalNumberOfDevices	WORD		2	Total number of devices ( 0 - cwMaxMumberOfDevices )
wActiveNumberOfDevices	WORD		0	Number of active devices ( 0 - wTotalNumberOfDevices )
xFb1	BOOL		FALSE	Running - device 1 ( TRUE = running )
xFb2	BOOL		FALSE	Running - device 2 ( TRUE = running )
xFb3	BOOL		FALSE	Running - device 3 ( TRUE = running )
xFb4	BOOL		FALSE	Running - device 4 ( TRUE = running )
xFb5	BOOL		FALSE	Running - device 5 ( TRUE = running )
xFb6	BOOL		FALSE	Running - device 6 ( TRUE = running )
xFb7	BOOL		FALSE	Running - device 7 ( TRUE = running )
xFb8	BOOL		FALSE	Running - device 8 ( TRUE = running )
xFb9	BOOL		FALSE	Running - device 9 ( TRUE = running )
xFb10	BOOL		FALSE	Running - device 10 ( TRUE = running )
xFb11	BOOL		FALSE	Running - device 11 ( TRUE = running )
xFb12	BOOL		FALSE	Running - device 12 ( TRUE = running )
xFb13	BOOL		FALSE	Running - device 13 ( TRUE = running )
xFb14	BOOL		FALSE	Running - device 14 ( TRUE = running )
xFb15	BOOL		FALSE	Running - device 15 ( TRUE = running )
xFb16	BOOL		FALSE	Running - device 16 ( TRUE = running )
xAlarm1	BOOL		TRUE	Fault - device 1 ( TRUE = fault )
xAlarm2	BOOL		TRUE	Fault - device 2 ( TRUE = fault )
xAlarm3	BOOL		TRUE	Fault - device 3 ( TRUE = fault )
xAlarm4	BOOL		TRUE	Fault - device 4 ( TRUE = fault )
xAlarm5	BOOL		TRUE	Fault - device 5 ( TRUE = fault )
xAlarm6	BOOL		TRUE	Fault - device 6 ( TRUE = fault )
xAlarm7	BOOL		TRUE	Fault - device 7 ( TRUE = fault )
xAlarm8	BOOL		TRUE	Fault - device 8 ( TRUE = fault )
xAlarm9	BOOL		TRUE	Fault - device 9 ( TRUE = fault )
xAlarm10	BOOL		TRUE	Fault - device 10 ( TRUE = fault )
xAlarm11	BOOL		TRUE	Fault - device 11 ( TRUE = fault )
xAlarm12	BOOL		TRUE	Fault - device 12 ( TRUE = fault )
xAlarm13	BOOL		TRUE	Fault - device 13 ( TRUE = fault )
xAlarm14	BOOL		TRUE	Fault - device 14 ( TRUE = fault )
xAlarm15	BOOL		TRUE	Fault - device 15 ( TRUE = fault )
xAlarm16	BOOL		TRUE	Fault - device 16 ( TRUE = fault )
uiOperatingHours1	UDINT		0	Operating hours - device 1
uiOperatingHours2	UDINT		0	Operating hours - device 2
uiOperatingHours3	UDINT		0	Operating hours - device 3
uiOperatingHours4	UDINT		0	Operating hours - device 4
uiOperatingHours5	UDINT		0	Operating hours - device 5
uiOperatingHours6	UDINT		0	Operating hours - device 6
uiOperatingHours7	UDINT		0	Operating hours - device 7
uiOperatingHours8	UDINT		0	Operating hours - device 8
uiOperatingHours9	UDINT		0	Operating hours - device 9
uiOperatingHours10	UDINT		0	Operating hours - device 10
uiOperatingHours11	UDINT		0	Operating hours - device 11
uiOperatingHours12	UDINT		0	Operating hours - device 12
uiOperatingHours13	UDINT		0	Operating hours - device 13
uiOperatingHours14	UDINT		0	Operating hours - device 14
uiOperatingHours15	UDINT		0	Operating hours - device 15
uiOperatingHours16	UDINT		0	Operating hours - device 16
xUpdate	BOOL			Trigger recalculation of the sequence on every rising edge

Outputs

Name	Data type	Value range	Initial value	Function
udiCurrentSequence	UDINT		0	Current device sequence as integer
sCurrentSequence	STRING		‘’	Current device sequence as string
wNumberOfOperationalDevices	WORD		0	Number of operational-ready devices
xCmd1	BOOL		FALSE	Enable - device 1 ( TRUE = enable )
xCmd2	BOOL		FALSE	Enable - device 2 ( TRUE = enable )
xCmd3	BOOL		FALSE	Enable - device 3 ( TRUE = enable )
xCmd4	BOOL		FALSE	Enable - device 4 ( TRUE = enable )
xCmd5	BOOL		FALSE	Enable - device 5 ( TRUE = enable )
xCmd6	BOOL		FALSE	Enable - device 6 ( TRUE = enable )
xCmd7	BOOL		FALSE	Enable - device 7 ( TRUE = enable )
xCmd8	BOOL		FALSE	Enable - device 8 ( TRUE = enable )
xCmd9	BOOL		FALSE	Enable - device 9 ( TRUE = enable )
xCmd10	BOOL		FALSE	Enable - device 10 ( TRUE = enable )
xCmd11	BOOL		FALSE	Enable - device 11 ( TRUE = enable )
xCmd12	BOOL		FALSE	Enable - device 12 ( TRUE = enable )
xCmd13	BOOL		FALSE	Enable - device 13 ( TRUE = enable )
xCmd14	BOOL		FALSE	Enable - device 14 ( TRUE = enable )
xCmd15	BOOL		FALSE	Enable - device 15 ( TRUE = enable )
xCmd16	BOOL		FALSE	Enable - device 16 ( TRUE = enable )
wPrio1	WORD		0	Current priority of device 1 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio2	WORD		0	Current priority of device 2 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio3	WORD		0	Current priority of device 3 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio4	WORD		0	Current priority of device 4 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio5	WORD		0	Current priority of device 5 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio6	WORD		0	Current priority of device 6 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio7	WORD		0	Current priority of device 7 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio8	WORD		0	Current priority of device 8 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio9	WORD		0	Current priority of device 9 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio10	WORD		0	Current priority of device 10 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio11	WORD		0	Current priority of device 11 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio12	WORD		0	Current priority of device 12 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio13	WORD		0	Current priority of device 13 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio14	WORD		0	Current priority of device 14 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio15	WORD		0	Current priority of device 15 ( 0 = none, 1 - wTotalNumberOfDevices )
wPrio16	WORD		0	Current priority of device 16 ( 0 = none, 1 - wTotalNumberOfDevices )
xErr	BOOL		FALSE	Output - fault
eOperationalCondition	eRedundance3_OperationalMode			Number / name of the current operating condition

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
xConOperatingHours	BOOL		TRUE	FALSE = follower switching only allowed via input xUpdate, TRUE = follower switching automatic after operating hours
xEnFb	BOOL		TRUE	FALSE = switching based on enable ( xCmdX ), TRUE = switching based on running signal ( xFbX )
wTolerance	WORD		100	Threshold - operating hours difference for direct follower change in partial load operation

Function description

General

This function block is used for redundant control of 0 - 8 identical devices depending on the influencing variables requirements ( wActiveNumberOfDevices ), operating hours ( uiOperatingHours ), operating states ( xFb ) and fault states ( xAlarm ).\

Input wTotalNumberOfDevices

This input is used to set the total number of usable devices. Devices are assigned consecutively starting from the lowest device numbers. Example: wTotalNumberOfDevices = 3: Devices 1 - 3 ( inputs and outputs ) are used / considered. Allowed range: 0 - cwMaxNumberOfDevices\

Input wActiveNumberOfDevices

This input is used to set the number of devices that should currently be used. Allowed range: 0 - wTotalNumberOfDevices\

Input xUpdate

Each rising edge on this input triggers a recalculation of the current device sequence. Boundary conditions: xConOperationHours = FALSE, operating hours difference = 0 hours.\

Output udiCurrentSequence

This output always shows the current device sequence as an integer. The number of the device with the highest priority is always at the beginning, then follows the number of the device with the second highest priority, etc. Example: udiCurrentSequence = 145 means: device 1 = priority 1, device 4 = priority 2 and device 5 = priority 3\

Output sCurrentSequence

This output always shows the current device sequence as a string with separators. The same priority rules apply as for the output udiCurrentSequence. Example: sdiCurrentSequence = ‘1-4-5’ means: device 1 = priority 1, device 4 = priority 2 and device 5 = priority 3\

Output wNumberOfOperationalDevices

This output always shows the number of operational-ready devices.\

Output fault xErr

This output is active ( = TRUE ) if at least one of the following conditions is met.\

1. wActiveNumberOfDevices > wTotalNumberOfDevices\

2. wTotalNumberOfDevices > cwMaxNumberOfDevices\

3. wActiveNumberOfDevices > wOperationalNumberofDevices\

In all other cases the output *xErr* is not active ( = FALSE ).\

Output eOperationalCondition

This output always represents the current load situation ( idle, partial load, full load ) depending on the setpoint / parameter xEnFb thereof. xEnFb = FALSE: The enable outputs xCmd of the operational-ready devices are evaluated / considered. xEnFb = TRUE: The running states xFb of the operational-ready devices are evaluated / considered. Example: xEnFb = TRUE, wTotalNumberOfDevices = 3 and xFb1 = TRUE and xFb2 = TRUE: Output = PartLoad_Inputs_Fb\

Setpoint / parameter xConOperatingHours

xConOperatingHours = FALSE: Switching of the device sequence is only triggered by a rising edge on input xUpdate triggered. xConOperatingHours = TRUE: Switching of the device sequence is triggered depending on operating hours, running signals ( when xEnFb = TRUE ) and the enables ( when xEnFb = FALSE ) is triggered.\

Setpoint / parameter xEnFb

xEnFb = FALSE: The enable outputs ‘xCmd’ of the operational-ready devices are evaluated / considered. xEnFb = TRUE: The running states ‘xFb’ of the operational-ready devices are evaluated / considered.\

Setpoint / parameter wTolerance

This setpoint determines the maximum operating hours difference before switching the device sequence due to operating hours. \

Determination of the device sequence

A switch of the device sequence can generally only occur if at least one of the following conditions is met: \

1. The fault state of at least one device ( devices 1 - wTotalNumberOfDevices ) has changed ( high priority )\

2. The total number of devices ( input wTotalNumberOfDevices ) ( 1 - cwMaxNumberOfDevices ) has changed ( high priority )\

3. The operating hours count of at least one operational-ready device ( devices 1 - wTotalNumberOfDevices ) has changed ( low priority )

Definition - idle: **xEnFb** = FALSE: The enable outputs ‘xCmd’ of all operational-ready devices ( devices 1 - *wTotalNumberOfDevices* ) are inactive ( = FALSE ) **xEnFb** = TRUE: The running signals ‘xFb’ of all operational-ready devices ( devices 1 - *wTotalNumberOfDevices* ) are inactive ( = FALSE ) Definition - full load: **xEnFb** = FALSE: The enable outputs ‘xCmd’ of all operational-ready devices ( devices 1 - *wTotalNumberOfDevices* ) are active ( = TRUE ) **xEnFb** = TRUE: The running signals ‘xFb’ of all operational-ready devices ( devices 1 - *wTotalNumberOfDevices* ) are active ( = TRUE ) Definition - partial load: **xEnFb** = FALSE: The number of enable outputs *xCmd* of all operational-ready devices that are active ( = TRUE ) is greater/equal to 1 and less than the number of all operational-ready devices ( devices 1 - *wTotalNumberOfDevices* ) **xEnFb** = FALSE: The number of running signals *xFb* of all operational-ready devices that are active ( = TRUE ) is greater/equal to 1 and less than the number of all operational-ready devices ( devices 1 - *wTotalNumberOfDevices* ) Switching with **high** priority ( = immediate ) depending on fault states ( inputs *xAlarm* ) and the input *wTotalNumberOfDevices* The fault state of each device in the range 1 - wTotalNumberOfDevices is recorded cyclically and evaluated for changes. The input wTotalNumberOfDevices is recorded cyclically and evaluated for changes. Each faulty device ( input xAlarm = TRUE ) in the range 1 - wTotalNumberOfDevices is no longer operational-ready. Any change in the fault state of at least one device in the range 1 - wTotalNumberOfDevices triggers an immediate recalculation of the device sequence. Any change on the input wTotalNumberOfDevices triggers an immediate recalculation of the device sequence. Switching with lower priority depending on operating hours ( inputs udiOperationHours ), operating states ( inputs xFb ) and enable outputs ( outputs xCmd ) of devices 1 - 3. The operating hours of each operational-ready device in the range 1 - wTotalNumberOfDevices are recorded cyclically and evaluated for changes. The operating states and enable outputs of each operational-ready device in the range 1 - wTotalNumberOfDevices are recorded cyclically. The recalculation of the device sequence takes place as soon as one of the situations described below applies: Situation 1 ( xConOperationHours = FALSE, rising edge on input xUpdate ) A recalculation of the device sequence is performed with an operating hours difference of 0 hours, i.e. the non-faulty device with the lowest operating hours has the highest priority ( in case of equal operating hours the device with the lower number has the higher priority ). Situation 2 ( xConOperationHours = TRUE, idle or full load ) In idle or under full load a recalculation of the device sequence is performed with an operating hours difference of 0 hours, i.e. the non-faulty device with the lowest operating hours has the highest priority ( in case of equal operating hours the device with the lower number has the higher priority ). The recalculation of the device sequence is triggered if the operating hours of at least one operational-ready device have changed. Situation 3 ( xConOperationHours = TRUE, partial load ) On the first transition to partial load operation a recalculation of the device sequence is performed with an operating hours difference of 0 hours, i.e. the non-faulty device with the lowest operating hours has the highest priority ( in case of equal operating hours the device with the lower number has the higher priority ). In regular partial load operation a recalculation of the device sequence is performed with an operating hours difference of wTolerance hours. The recalculation of the device sequence is triggered if the operating hours of at least one operational-ready device have changed. \

Enable outputs <br/>*<br/> xCmd’

The states of the outputs of the devices in the range 1 - *wTotalNumberOfDevices* are finally determined as follows: The enable outputs of the operational-ready devices in the range 1 - *wTotalNumberOfDevices* are activated if their current priority <= the number of requested devices ( input *wActiveNumberOfDevices* ). The enable outputs of the operational-ready devices in the range 1 - *wTotalNumberOfDevices* are deactivated if their current priority > the number of requested devices ( input *wActiveNumberOfDevices* ). \

Priority outputs wPrio

The priority outputs of each device always contain the current priority in the range 0 - *wTotalNumberOfDevices*. Priority = 0: The device has no or an invalid priority Priority = 1: The device has the highest priority Priority = 2: The device has the second highest priority Priority = 3: The device has the third highest priority etc.\

CODESYS

InOut:

Scope	Name	Type	Initial
Input	wTotalNumberOfDevices	WORD	2
Input	wActiveNumberOfDevices	WORD	0
Input	xFb1	BOOL	FALSE
Input	xFb2	BOOL	FALSE
Input	xFb3	BOOL	FALSE
Input	xFb4	BOOL	FALSE
Input	xFb5	BOOL	FALSE
Input	xFb6	BOOL	FALSE
Input	xFb7	BOOL	FALSE
Input	xFb8	BOOL	FALSE
Input	xFb9	BOOL	FALSE
Input	xFb10	BOOL	FALSE
Input	xFb11	BOOL	FALSE
Input	xFb12	BOOL	FALSE
Input	xFb13	BOOL	FALSE
Input	xFb14	BOOL	FALSE
Input	xFb15	BOOL	FALSE
Input	xFb16	BOOL	FALSE
Input	xAlarm1	BOOL	TRUE
Input	xAlarm2	BOOL	TRUE
Input	xAlarm3	BOOL	TRUE
Input	xAlarm4	BOOL	TRUE
Input	xAlarm5	BOOL	TRUE
Input	xAlarm6	BOOL	TRUE
Input	xAlarm7	BOOL	TRUE
Input	xAlarm8	BOOL	TRUE
Input	xAlarm9	BOOL	TRUE
Input	xAlarm10	BOOL	TRUE
Input	xAlarm11	BOOL	TRUE
Input	xAlarm12	BOOL	TRUE
Input	xAlarm13	BOOL	TRUE
Input	xAlarm14	BOOL	TRUE
Input	xAlarm15	BOOL	TRUE
Input	xAlarm16	BOOL	TRUE
Input	udiOperatingHours1	UDINT	0
Input	udiOperatingHours2	UDINT	0
Input	udiOperatingHours3	UDINT	0
Input	udiOperatingHours4	UDINT	0
Input	udiOperatingHours5	UDINT	0
Input	udiOperatingHours6	UDINT	0
Input	udiOperatingHours7	UDINT	0
Input	udiOperatingHours8	UDINT	0
Input	udiOperatingHours9	UDINT	0
Input	udiOperatingHours10	UDINT	0
Input	udiOperatingHours11	UDINT	0
Input	udiOperatingHours12	UDINT	0
Input	udiOperatingHours13	UDINT	0
Input	udiOperatingHours14	UDINT	0
Input	udiOperatingHours15	UDINT	0
Input	udiOperatingHours16	UDINT	0
Input	xUpdate	BOOL
Input Const	xConOperatingHours	BOOL	TRUE
Input Const	xEnFb	BOOL	TRUE
Input Const	wTolerance	WORD	100
Output	udiCurrentSequence	UDINT	0
Output	sCurrentSequence	STRING	‘’
Output	wNumberOfOperationalDevices	WORD	0
Output	xCmd1	BOOL	FALSE
Output	xCmd2	BOOL	FALSE
Output	xCmd3	BOOL	FALSE
Output	xCmd4	BOOL	FALSE
Output	xCmd5	BOOL	FALSE
Output	xCmd6	BOOL	FALSE
Output	xCmd7	BOOL	FALSE
Output	xCmd8	BOOL	FALSE
Output	xCmd9	BOOL	FALSE
Output	xCmd10	BOOL	FALSE
Output	xCmd11	BOOL	FALSE
Output	xCmd12	BOOL	FALSE
Output	xCmd13	BOOL	FALSE
Output	xCmd14	BOOL	FALSE
Output	xCmd15	BOOL	FALSE
Output	xCmd16	BOOL	FALSE
Output	wPrio1	WORD	0
Output	wPrio2	WORD	0
Output	wPrio3	WORD	0
Output	wPrio4	WORD	0
Output	wPrio5	WORD	0
Output	wPrio6	WORD	0
Output	wPrio7	WORD	0
Output	wPrio8	WORD	0
Output	wPrio9	WORD	0
Output	wPrio10	WORD	0
Output	wPrio11	WORD	0
Output	wPrio12	WORD	0
Output	wPrio13	WORD	0
Output	wPrio14	WORD	0
Output	wPrio15	WORD	0
Output	wPrio16	WORD	0
Output	xErr	BOOL	FALSE
Output	eOperationalCondition	eRedundance3_OperationalMode