FB_Watch - General Information

Overview

Type:	Function block
Available as of:	1.2.10.0
Versions:	Current version

Task

The POU controls the mains contactor of a machine with simple exemption.

Description

The POU switches off the machine mains contactor via the q_xMainsContactor output and monitors the contactor via the i_xMainsWatch input. The exceptional states of the machine are signalled via the i_xAlarmCalass1 and the i_xAlarmClass3 input. According to these exceptions, the master and the slave axis are stopped via the q_xMasterStop, the q_xMasterQStop and the q_xSlaveStop outputs and, if necessary, brought to a standstill via the q_xAxisEnable output.

For more information concerning the operating principle, please refer to chapter Use of FB_Watch.

Interface

Input	Data type	Description
i_xEnable	BOOL	A rising edge FALSE -> TRUE activates the POU, a falling edge TRUE -> FALSE deactivates the POU. A deactivated POU does not execute any actions.
i_xMainsWatch	BOOL	The feedback signal of a mains contactor N/C contact.
i_xMainsOff	BOOL	TRUE: the mains contactor is switched off. FALSE: the mains contactor is managed by the function block.
i_timPowerOnDelay	TIME	Required time for the mains contactor to switch on.
i_xAlarmClass1	BOOL	TRUE: alarm class 1 is enabled.
i_xAlarmClass2	BOOL	TRUE: alarm class 2 is enabled.
i_xAlarmClass3	BOOL	TRUE: alarm class 3 is enabled.
i_lrMasterVel	LREAL	Current velocity of the master axis.
i_timMasterStop	TIME	Time in which the master in alarm class 2 must come to a stop.
i_xAlarmQuit	BOOL	A positive edge acknowledges all alarm classes.

Output	Data type	Description
q_xActive	BOOL	TRUE: The POU is active and has to be executed further. FALSE: The POU is inactive.
q_xReady	BOOL	TRUE: The POU is ready to operate and can accept user commands. FALSE: The POU is not ready to accept user commands.
q_etDiag	GD.ET_Diag	General library-independent statement on the diagnostic. A value unequal to GD.ET_Diag.Ok corresponds to a diagnostic message.
q_etDiagExt	ET_DiagExt	POU-specific output on the diagnostic. q_etDiag = GD.ET_Diag.Ok -> status message q_etDiag <> GD.ET_Diag.Ok -> diagnostic message
q_sMsg	STRING[80]	Event-triggered message which gives more detailed information on the diagnostic state.
q_diAlarmLevel	DINT	Current alarm level Following values are output: - 10: alarm class 1 is active - 20: alarm class 2 is active - 30: alarm class 3 is active
q_xAxisEnable	BOOL	Output with which the input i_xEnableDrive of the corresponding FB_DriveEnable function block has to be connected.
q_xAlarm	BOOL	TRUE: an alarm is enabled.
q_xMasterStop	BOOL	Output that has to be connected with i_xStart of the master motion.
q_xMasterQStop	BOOL	Output that has to be connected with i_xEnable of the master motion.
q_xSlaveStop	BOOL	Output that has to be connected with i_xEnable of the slave motion.
q_xMainsContactor	BOOL	Output that has to be connected with the digital output which switches off the mains contactor.

Diagnostic Messages

q_etDiag	q_etDiagExt	Enumeration value	Description
OK	AlarmLevel1	310	Alarm level 1
OK	AlarmLevel2	311	Alarm level 2
OK	AlarmLevel3	312	Alarm level 3
OK	Disabled	9	The POU is disabled.
OK	MainsOffAlarm	308	Mains off alarm
OK	PowerOn	303	Power is on
OK	WaitForAlarmReset	307	Wait until alarm is acknowledged.
OK	WaitForMainsWatch	301	Waiting for mains watch signal
OK	WaitForMasterStopped	304	Waiting for master to stop
OK	WaitForMasterStoppedTimeOut	305	Waiting for the master to stop with TimeOut
OK	WaitForPowerOnDelay	302	Wait for switch-on delay
ControllerConditionInvalid	ControllerInvalid	100	The controller is not supported.
ExecutionAborted	MainsWatchException	309	Mains watch exception

AlarmLevel1

Enumeration name:	AlarmLevel1
Enumeration value:	310
Description:	Alarm level 1

An alarm has been triggered at the i_xAlarmClass1 input.

AlarmLevel2

Enumeration name:	AlarmLevel2
Enumeration value:	311
Description:	Alarm level 2

An alarm has been triggered at the i_xAlarmClass2 input.

AlarmLevel3

Enumeration name:	AlarmLevel3
Enumeration value:	312
Description:	Alarm level 3

An alarm has been triggered at the i_xAlarmClass3 input.

ControllerInvalid

Enumeration name:	ControllerInvalid
Enumeration value:	100
Description:	The controller is not supported.

Issue	Cause	Solution
-	The controller does not provide the required conditions.	For more details, see output q_sMsg.

Disabled

Enumeration name:	Disabled
Enumeration value:	9
Description:	The POU is disabled.

The function block is disabled and executes no actions whatsoever. i_xEnable and q_xActive are set to FALSE

MainsOffAlarm

Enumeration name:	MainsOffAlarm
Enumeration value:	308
Description:	Mains off alarm

The i_xMainsOff input forces the mains contactor to switch off.

MainsWatchException

Enumeration name:	MainsWatchException
Enumeration value:	309
Description:	Mains watch exception

Issue	Cause	Solution
-	The mains contactor does not switch. After a positive edge on the i_xEnable input, the mains contactor reports a TRUE signal at the i_xMainsWatch input for a longer period than the time span defined by the i_timPowerOnDelay input.	Verify the mains contactor. Verify the signal path of the mains contactor feedback.
-	The mains contactor failed during operation (i_xMainsWatch input receives a TRUE signal) without the q_xMainsContactor output having been set to FALSE.	Verify the mains contactor.
-	When switching on the function block the mains contactor already reports that it is active (i_xMainsWatch = False).	Verify the mains contactor. Verify the corresponding variable. Verify the signal path of the mains contactor feedback.

Issue

Cause

Solution

The mains contactor does not switch.

After a positive edge on the i_xEnable input, the mains contactor reports a TRUE signal at the i_xMainsWatch input for a longer period than the time span defined by the i_timPowerOnDelay input.

Verify the mains contactor.

Verify the signal path of the mains contactor feedback.

The mains contactor failed during operation (i_xMainsWatch input receives a TRUE signal) without the q_xMainsContactor output having been set to FALSE.

Verify the mains contactor.

When switching on the function block the mains contactor already reports that it is active (i_xMainsWatch = False).

Verify the mains contactor.

Verify the corresponding variable.

Verify the signal path of the mains contactor feedback.

PowerOn

Enumeration name:	PowerOn
Enumeration value:	303
Description:	Power is on

The mains contactor is enabled and no alarm class is enabled.

WaitForAlarmReset

Enumeration name:	WaitForAlarmReset
Enumeration value:	307
Description:	Wait until alarm is acknowledged.

Pending alarms and exceptions are acknowledged.

WaitForMainsWatch

Enumeration name:	WaitForMainsWatch
Enumeration value:	301
Description:	Waiting for mains watch signal

Awaiting the mains contactor to be disabled.

WaitForMasterStopped

Enumeration name:	WaitForMasterStopped
Enumeration value:	304
Description:	Waiting for master to stop

Awaiting the master to stop in alarm class 3.

WaitForMasterStoppedTimeOut

Enumeration name:	WaitForMasterStoppedTimeOut
Enumeration value:	305
Description:	Waiting for the master to stop with TimeOut

Awaiting the master to stop in alarm class 2, monitored with a i_timMasterStop.

WaitForPowerOnDelay

Enumeration name:	WaitForPowerOnDelay
Enumeration value:	302
Description:	Wait for switch-on delay

Awaiting a i_timPowerOnDelay time out in which the mains contactor is switched on.