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Example of the configuration. The original workstation had the following operations:
* KN1 - Part check
* KN2 - Optional part check
* KN3 - Optional tightening
* KN4 - Optional tightening
The request for the table lock is: "The table will be locked after OK result of the part check KN2. The tightening machine must be blocked untill the table will be locked. When all operations are finished, the table will be unlocked."

To register the event when the table is locked, we created a new operation KN6, type RackPartCheck. An input for this operation is a signal from the lock, that the table was locked. Then the dependency of KN3 and KN4 on KN6 can be used for the tightening machine blocking.

Here is the new definition of operations:

 operation.PartCheck_1.Type = PartCheck
 operation.PartCheck_1.Index = 1
 operation.PartCheck_1.WindowTitle = Oblozeni / Airbag
 operation.PartCheck_1.ToDoMessage = Scan Oblozeni / Airbag
 operation.PartCheck_1.Default = 1
 operation.PartCheck_1.ToleranceOverPlan = 0
 operation.PartCheck_1.SelectBegin[0] = " 7P5 858 903"
 operation.PartCheck_1.SelectBegin[1] = 7P5858903

 operation.Knieairbag.Type = PartCheck
 operation.Knieairbag.Index = 2
 '''operation.Knieairbag.ReportDevice = report_kn2''' ''# After OK part check we activate this device (see below to devices definition). The table will be locked''
 operation.Knieairbag.WindowTitle = Knieairbag
 operation.Knieairbag.ToDoMessage = Scan "Knieairbag"
 operation.Knieairbag.Default = 1
 operation.Knieairbag.ToleranceOverPlan = 0
 operation.Knieairbag.SelectBegin[0] = "363#"
 operation.Knieairbag.PartLength[0] = 18
 operation.Knieairbag.PartStart[0] = 5
 operation.Knieairbag.SNStore = Yes
 operation.Knieairbag.InvalidLabelAllowed = No

 operation.Tightening_1.Type = Tightening
 operation.Tightening_1.Index = 3
 operation.Tightening_1.Device = tight_mach_1
 '''operation.Tightening_1.DependsOn = 6''' ''# The tightening machine is unblocked after the table is locked''
 operation.Tightening_1.ChannelNumber = 1
 operation.Tightening_1.WindowTitle = Knieairbag 1
 operation.Tightening_1.Spec[0] = 1
 operation.Tightening_1.Tool = 1
 operation.Tightening_1.Default = 8
 operation.Tightening_1.ToleranceOverPlan = 1

 operation.Tightening_2.Type = Tightening
 operation.Tightening_2.Index = 4
 operation.Tightening_2.Device = tight_mach_1
 '''operation.Tightening_2.DependsOn = 6''' ''# The tightening machine is unblocked after the table is locked''
 operation.Tightening_2.ChannelNumber = 1
 operation.Tightening_2.WindowTitle = Knieairbag 2
 operation.Tightening_2.Spec[0] = 2
 operation.Tightening_2.Tool = 2
 operation.Tightening_2.Default = 3
 operation.Tightening_2.ToleranceOverPlan = 1

 New operation
 operation.Zamek_stolu.Type = RackPartCheck
 operation.Zamek_stolu.Index = 6
 '''operation.Zamek_stolu.Device = zamek_stolu''' ''# When the table is locked, this operation is confirmed and tightening machines can be unblocked.''
 operation.Zamek_stolu.DependsOn = 2
 operation.Zamek_stolu.WindowTitle = Table lock
 operation.Zamek_stolu.ToDoMessage = Lock the table
 operation.Zamek_stolu.Default = 1
 operation.Zamek_stolu.ToleranceOverPlan = 0
 operation.Zamek_stolu.SelectPattern[0] = NO_BARCODE
 operation.Zamek_stolu.SNStore = No

 # A device for the table lock. The table is locked by the report device "report_kn" (on an operation KN2) and this
 # report device is released when the complete product is finished. The RackPartCheck defice "zamek_stolu" reports
 # us when the table is really locked. Both devices share one low level device. First two bits (0 and 1)
 # are used by the report device and the bit 2 is used by the RackPartCheck device.
 
 #include "/usr/local/plc/etc/drivers/RACK_IO.drv"
 #include "/usr/local/plc/etc/drivers/REPORT_IO.drv"
 workplace.devicehub.rackshub1 = yes
 
 workplace.devicehub.rackshub1.low_level.device.racks1 = yes
 workplace.devicehub.rackshub1.low_level.device.racks1.driver = RACK_IO
 workplace.devicehub.rackshub1.low_level.device.racks1.settings.output_reverse_logic = no
 workplace.devicehub.rackshub1.low_level.device.racks1.settings.debug_mode = no
 workplace.devicehub.rackshub1.low_level.device.racks1.settings.log_file = /usr/local/plc/log/rack1_io.log
 workplace.devicehub.rackshub1.low_level.device.racks1.hub_map_to = 0
 workplace.devicehub.rackshub1.low_level.device.racks1.hub_map_bits = 4
 
 workplace.devicehub.rackshub1.high_level.device.report_kn2 = yes
 workplace.devicehub.rackshub1.high_level.device.report_kn2.driver = REPORT_IO
 workplace.devicehub.rackshub1.high_level.device.report_kn2.settings.debug_mode = no
 workplace.devicehub.rackshub1.high_level.device.report_kn2.hub_map_from = 0
 workplace.devicehub.rackshub1.high_level.device.report_kn2.hub_map_bits = 2
 
 workplace.devicehub.rackshub1.high_level.device.zamek_stolu = yes
 workplace.devicehub.rackshub1.high_level.device.zamek_stolu.driver = RACK_IO
 workplace.devicehub.rackshub1.high_level.device.zamek_stolu.settings.debug_mode = no
 workplace.devicehub.rackshub1.high_level.device.zamek_stolu.hub_map_from = 2
 workplace.devicehub.rackshub1.high_level.device.zamek_stolu.hub_map_bits = 1