The Network Data Model (NDM) class supports sending and receiving
messages between the vision system and a remote device
(usually a PLC) over an Ethernet based Factory Floor Protocol (FFP).
The Network Data Model (NDM) is the way Cognex Vision Systems interact with a PLC.
Note: The instance number for the Rockwell Input Assembly is 11 and for the Output Assembly is 21.
Inheritance Hierarchy
Cognex.VisionPro.Comm CogNdm
Cognex.VisionPro.Comm CogNdmEip
Cognex.VisionPro.Comm CogNdmProfinet
Cognex.VisionPro.Comm CogNdmSlmp
Namespace: Cognex.VisionPro.Comm
Assembly: Cognex.VisionPro.Comm (in Cognex.VisionPro.Comm.dll) Version: 75.1.0.0
Syntax
The CogNdm type exposes the following members.
Methods
| Name | Description | |
|---|---|---|
 | Dispose | |
 | Dispose(Boolean) | |
| Equals | (Inherited from Object.) |
| Finalize | (Overrides Object Finalize .) |
| GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetProtocolConnectionStatus |
Gets the connection status for the specified protocol.
|
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| NotifyAcquisitionComplete |
Notify the remote device (PLC) that an acquisition has completed.
You must call this method to notify the PLC when an an acquisiton is
complete. If you do not call this function the Trigger Ready bit
will never get re-enabled an no more acquisitions can occur.
|
| NotifyAcquisitionDisabled |
Optionally notify the remote device (PLC) that the Vision System is unable to
receive acquisition triggers.
|
| NotifyAcquisitionError |
Notify the remote device (PLC) that an acquisition error has occurred.
|
| NotifyAcquisitionMovePart |
Optionally notify the remote device (PLC) that the exposure is complete or the
strobe has fired and it is now safe to move the part from the
field of view.
|
| NotifyAcquisitionReady |
Notify the remote device (PLC) that the Vision System is ready to
receive the first acquisition trigger.
|
| NotifyAcquisitionStarted |
Optionally notify the remote device (PLC) that an acquisition has started.
|
| NotifyAsyncSoftEventComplete |
Notify the remote device (PLC) that an asynchronous soft event has completed.
|
| NotifyError |
Notify the remote device (PLC) that the Vision System has encountered an error.
|
| NotifyInspectionComplete(CogNdmInspectionResult) |
Notify the remote device (PLC) that an inspection has finished.
|
| NotifyInspectionComplete(Int32, CogNdmUsedAcquisitionIDCollection, Boolean, Int32, Byte , Int32) |
Notify the remote device (PLC) that an inspection has finished.
|
| NotifyJobState |
Notify the remote device (PLC) which job is loaded.
|
| NotifyRunning |
Notify the remote device (PLC) that the Vision System is running or "online".
|
| NotifyStopped |
Notify the remote device (PLC) that the Vision System stopped running or gone "offline".
|
| NotifySystemStatus |
Notifies the remote device (PLC) of the Vision System status.
|
| ReadUserData |
Reads user data sent from the remote device (PLC) to the vision system.
Values returned from this function will not reflect changes to the user data present on the remote system until the remote system signals the vision system that new user data is available by sendng a "Set User Data" signal. |
| Start |
Start the Network Data Model (NDM). Calling Start() opens network sockets and
allows connections from a remote device (PLC). You must call Start() on a CogNdm instance
returned from
CreateNetworkDataModel
in order for the NDM to connect to a remote device (PLC).
|
| Stop |
Stop the Network Data Model (NDM). Closes all connections and prevents
further connections from being established.
|
| ToString | (Inherited from Object.) |
Events
| Name | Description | |
|---|---|---|
 | ClearError |
The NDM raises the ClearError event to inform the vision system
that the remote device has been notified of an error reported by the
vision system and the error has been be cleared.
Handle this event to know when the remote device has acknowledged an error and normal operation can continue. |
| JobChangeRequested | |
| NewUserData |
The NDM raises the NewUserData event to tell the vision system
that new user data has arrived from the remote device.
Handle this event and call ReadUserData(Int32, Int32) to read the new user data. Note that changes to the user data present on the remote device cannot be read until the remote device signals the vision system that new user data is available by sending a "Set User Data" signal. The remote device can send separate "Set User Data" signals for each user data channel. Use the ChannelIndex property of the event args to determine which "Set User Data" signal was received. Upon returning from the event handler, the remote device is automatically notified by sending the “Set User Data Ack” signal. |
| OfflineRequested |
The NDM raises the OfflineRequested event to tell the vision system
that it should go offline.
Handle this event and use the ReturnToPreviousState property of the event args to determine whether to transition the vision system offline or return it to its previous state. |
| ProtocolStatusChanged |
The NDM raises the ProtocolStatusChanged event to inform the vision system
that the status of the underlying protocol has changed.
Handle this event and use the RemoteAddress and ProtocolStatus properties of the event args to determine how the protocol status has changed. |
| TriggerAcquisition |
The NDM raises the TriggerAcquisition event to inform the vision system that the
remote device has requested an image Acquisition.
Handle this event and use the CameraIndex property of the event args to determine which camera should perform the image acquisition. Set the ResponseCode property of the event args to notify the remote device if an acquisition error has occurred. |
| TriggerAcquisitionDisabledError |
The NDM raises the TriggerAcquisitionDisabledError event to tell the vision system
that an acquisition trigger was set but the acquisition trigger was not enabled.
|
| TriggerAcquisitionNotReadyError |
The NDM raises the TriggerAcquisitionNotReadyError event when the remote device asserts
a "Trigger Camera" signal high without waiting for the vision system to signal that
it's ready to receive triggers by setting the "Trigger Ready" signal high.
Handle this event and use the CameraIndex to identify which camera channel was triggered before it was ready. Your user code should call NotifyAcquisitionComplete(Int32, Int32) to signal that the vision system that it has completed the current acquisition and is ready to receive another "Trigger Camera" signal from the remote device. |
| TriggerAcquisitionStop |
The NDM raises the TriggerAcquisitionStop event to tell the vision system
that the Acquisition trigger has been reset.
Handle this event and use the CameraIndex property of the event args to determine which camera trigger was reset. |
| TriggerSoftEvent |
The NDM raises the TriggerSoftEvent event to inform the vision system
that the remote device has requested that a soft event execute.
Handle this event and use the SoftEventID property of the event args to determine which soft event should execute. Set the ResponseCode property of the event args to notify the remote device of the status of the soft event when the event handler returns. |
| TriggerSoftEventOff |
The NDM raises the TriggerSoftEventOff event to tell the vision system
that the soft event trigger bit has been reset.
Handle this event and use the SoftEventID property of the event args to determine which soft event has been reset. |
Remarks
NDM Status Signal Table (Status signals are signals sent from the Vision System to the PLC) +----------------------------------------------------------------------------------------------------------+ ¦ ¦ Bit 7 ¦ Bit 6 ¦ Bit 5 ¦ Bit 4 ¦ Bit 3 ¦ Bit 2 ¦ Bit 1 ¦ Bit 0 ¦ +----------------------------------------------------------------------------------------------------------+ --- ¦ 0 ¦ Online ¦ Offline ¦ Rsvd ¦ Rsvd ¦ System ¦ System ¦ | ¦ ¦ ¦ Reason ¦ ¦ ¦ Busy ¦ Ready ¦ S | +----------------------------------------------------------------------------------------------------------+ y | ¦ 1 ¦ General ¦ Rsvd ¦ Job Load ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ s | ¦ ¦ Fault ¦ ¦ Completed ¦ ¦ ¦ ¦ ¦ ¦ t | +----------------------------------------------------------------------------------------------------------+ e | ¦ 2 ¦ Reserved ¦ m | +----------------------------------------------------------------------------------------------------------+ | ¦ 3 ¦ Reserved ¦ S | +----------------------------------------------------------------------------------------------------------+ t | ¦ 4-5 ¦ Current Job ID ¦ a | +----------------------------------------------------------------------------------------------------------+ t | ¦ 6-7 ¦ Error ID ¦ u | +----------------------------------------------------------------------------------------------------------+ s | ¦ 8-11 ¦ Soft Event Ack 0-31 ¦ | +----------------------------------------------------------------------------------------------------------+ | ¦ 12-15 ¦ Reserved ¦ | +----------------------------------------------------------------------------------------------------------+ --- ¦ 16 ¦ Results ¦ Inspection ¦ Results ¦ Inspection ¦ Exposure ¦ Acq ¦ Trigger ¦ Trigger ¦ | ¦ ¦ Buffer ¦ Passed 0 ¦ Valid 0 ¦ Completed 0 ¦ Complete 0 ¦ Error 0 ¦ Ack ¦ Ready ¦ E | ¦ ¦ Overrun 0 ¦ ¦ ¦ ¦ ¦ ¦ Camera 0 ¦ Camera 0 ¦ n | +----------------------------------------------------------------------------------------------------------+ g | ¦ 17 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ UserData ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ Ack 0 ¦ e | +----------------------------------------------------------------------------------------------------------+ | ¦ 18-19 ¦ Acquisition ID 0 ¦ 0 | +----------------------------------------------------------------------------------------------------------+ | ¦ 20-21 ¦ Inspected Image ID 0 ¦ | +----------------------------------------------------------------------------------------------------------+ | ¦ 22-23 ¦ Inspection Result Code 0 ¦ | +----------------------------------------------------------------------------------------------------------+ --- ¦ 24 ¦ Results ¦ Inspection ¦ Results ¦ Inspection ¦ Exposure ¦ Acq ¦ Trigger ¦ Trigger ¦ | ¦ ¦ Buffer ¦ Passed 1 ¦ Valid 1 ¦ Completed 1 ¦ Complete 1 ¦ Error 1 ¦ Ack ¦ Ready ¦ E | ¦ ¦ Overrun 1 ¦ ¦ ¦ ¦ ¦ ¦ Camera 1 ¦ Camera 1 ¦ n | +----------------------------------------------------------------------------------------------------------+ g | ¦ 25 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ UserData ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ Ack 1 ¦ e | +----------------------------------------------------------------------------------------------------------+ | ¦ 26-27 ¦ Acquisition ID 1 ¦ 1 | +----------------------------------------------------------------------------------------------------------+ | ¦ 28-29 ¦ Inspected Image ID 1 ¦ | +----------------------------------------------------------------------------------------------------------+ | ¦ 30-31 ¦ Inspection Result Code 1 ¦ | +----------------------------------------------------------------------------------------------------------+ --- ¦ 32 ¦ Results ¦ Inspection ¦ Results ¦ Inspection ¦ Exposure ¦ Acq ¦ Trigger ¦ Trigger ¦ | ¦ ¦ Buffer ¦ Passed 2 ¦ Valid 2 ¦ Completed 2 ¦ Complete 2 ¦ Error 2 ¦ Ack ¦ Ready ¦ E | ¦ ¦ Overrun 2 ¦ ¦ ¦ ¦ ¦ ¦ Camera 2 ¦ Camera 2 ¦ n | +----------------------------------------------------------------------------------------------------------+ g | ¦ 33 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ UserData ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ Ack 2 ¦ e | +----------------------------------------------------------------------------------------------------------+ | ¦ 34-35 ¦ Acquisition ID 2 ¦ 2 | +----------------------------------------------------------------------------------------------------------+ | ¦ 36-37 ¦ Inspected Image ID 2 ¦ | +----------------------------------------------------------------------------------------------------------+ | ¦ 38-39 ¦ Inspection Result Code 2 ¦ | +----------------------------------------------------------------------------------------------------------+ --- ¦ 40 ¦ Results ¦ Inspection ¦ Results ¦ Inspection ¦ Exposure ¦ Acq ¦ Trigger ¦ Trigger ¦ | ¦ ¦ Buffer ¦ Passed 3 ¦ Valid 3 ¦ Completed 3 ¦ Complete 3 ¦ Error 3 ¦ Ack ¦ Ready ¦ E | ¦ ¦ Overrun 3 ¦ ¦ ¦ ¦ ¦ ¦ Camera 3 ¦ Camera 3 ¦ n | +----------------------------------------------------------------------------------------------------------+ g | ¦ 41 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ UserData ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ Ack 3 ¦ e | +----------------------------------------------------------------------------------------------------------+ | ¦ 42-43 ¦ Acquisition ID 3 ¦ 3 | +----------------------------------------------------------------------------------------------------------+ | ¦ 44-45 ¦ Inspected Image ID 3 ¦ | +----------------------------------------------------------------------------------------------------------+ | ¦ 46-47 ¦ Inspection Result Code 3 ¦ | +----------------------------------------------------------------------------------------------------------+ --- ¦ 48-??? ¦ Inspection Results ¦ | ¦ ¦ ¦ R | ¦ ¦ ¦ e | ¦ ¦ ¦ s | ¦ ¦ ¦ u | ¦ ¦ ¦ l | ¦ ¦ ¦ t | ¦ ¦ ¦ s | ¦ ¦ ¦ | +----------------------------------------------------------------------------------------------------------+ ----
NDM Control Signal Table (Controls signals are signals sent from the PLC to the Vision System) +--------------------------------------------------------------------------------------------------+ ¦ ¦ Bit 7 ¦ Bit 6 ¦ Bit 5 ¦ Bit 4 ¦ Bit 3 ¦ Bit 2 ¦ Bit 1 ¦ Bit 0 ¦ +--------------------------------------------------------------------------------------------------+ --- ¦ 0 ¦ Set ¦ Clear ¦ Reserved ¦ Initiate ¦ Rsvd ¦ Rsvd ¦ Buffer ¦ Trigger ¦ | ¦ ¦ Offline ¦ Error ¦ ¦ Job ¦ ¦ ¦ Results ¦ Enable ¦ S | ¦ ¦ ¦ ¦ ¦ Load ¦ ¦ ¦ Enable ¦ ¦ y | +--------------------------------------------------------------------------------------------------+ s | ¦ 1 ¦ Reserved ¦ t | +--------------------------------------------------------------------------------------------------+ e | ¦ 2-3 ¦ Job Load ID ¦ m | +--------------------------------------------------------------------------------------------------+ | ¦ 4-7 ¦ SoftEvent 0-31 ¦ C | +--------------------------------------------------------------------------------------------------+ o | ¦ 8-9 ¦ Reserved ¦ n | +--------------------------------------------------------------------------------------------------+ t | ¦ 10-11 ¦ Reserved ¦ r | +--------------------------------------------------------------------------------------------------+ o | ¦ 12-13 ¦ Reserved ¦ l | +--------------------------------------------------------------------------------------------------+ | ¦ 14-15 ¦ Reserved ¦ | +--------------------------------------------------------------------------------------------------+ --- ¦ 16 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ Clear ¦ Inspection ¦ Trigger ¦ | ¦ ¦ ¦ ¦ ¦ ¦ User ¦ Exposure ¦ Results ¦ Camera 0 ¦ E | ¦ ¦ ¦ ¦ ¦ ¦ Data 0 ¦ Complete 0 ¦ Ack 0 ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ g | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ e | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ 0 | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | +--------------------------------------------------------------------------------------------------+ --- ¦ 17 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ Clear ¦ Inspection ¦ Trigger ¦ | ¦ ¦ ¦ ¦ ¦ ¦ User ¦ Exposure ¦ Results ¦ Camera 1 ¦ E | ¦ ¦ ¦ ¦ ¦ ¦ Data 1 ¦ Complete 1 ¦ Ack 1 ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ g | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ e | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ l | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | +--------------------------------------------------------------------------------------------------+ --- ¦ 18 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ Clear ¦ Inspection ¦ Trigger ¦ | ¦ ¦ ¦ ¦ ¦ ¦ User ¦ Exposure ¦ Results ¦ Camera 2 ¦ E | ¦ ¦ ¦ ¦ ¦ ¦ Data 2 ¦ Complete 2 ¦ Ack 2 ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ g | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ e | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ 2 | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | +--------------------------------------------------------------------------------------------------+ --- ¦ 19 ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Rsvd ¦ Set ¦ Clear ¦ Inspection ¦ Trigger ¦ | ¦ ¦ ¦ ¦ ¦ ¦ User ¦ Exposure ¦ Results ¦ Camera 3 ¦ E | ¦ ¦ ¦ ¦ ¦ ¦ Data 3 ¦ Complete 3 ¦ Ack 3 ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ g | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ i | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ n | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ e | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ 3 | ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ | +--------------------------------------------------------------------------------------------------+ --- ¦ 20-??? ¦ User Data ¦ | ¦ ¦ ¦ U | ¦ ¦ ¦ s | ¦ ¦ ¦ e | ¦ ¦ ¦ r | ¦ ¦ ¦ | ¦ ¦ ¦ D | ¦ ¦ ¦ a | ¦ ¦ ¦ t | ¦ ¦ ¦ a | ¦ ¦ ¦ | +--------------------------------------------------------------------------------------------------+ ----
See Also