The EncoderProbeType represents the Encoder’s probe functionality.
Table 20 – EncoderProbeType Definition
|
Attribute |
Value |
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|
BrowseName |
EncoderProbeType |
||||
|
IsAbstract |
False |
||||
|
References |
Node Class |
BrowseName |
DataType |
TypeDefinition |
Other |
|
Subtype of the 0:BaseObjectType defined in OPC 10000-5. |
|||||
|
0:HasComponent |
Object |
Lock |
|
2:LockingServicesType |
O |
|
0:HasComponent |
Method |
LatchStart |
|
|
O |
|
0:HasComponent |
Variable |
LatchActive |
0:Boolean |
0:BaseDataVariableType |
O, RO |
|
0:HasComponent |
Variable |
LastLatchedPos |
0:Number |
0:BaseDataVariableType |
M, RO |
|
0:GeneratesEvent |
ObjectType |
EncoderProbeLatchEventType |
|
|
|
|
Conformance Units |
|||||
|
PNENC Probes |
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The Lock Object ensures exclusive call of the LatchStart Method for one Client. The Client locks the EncoderProbeType Object by invoking the InitLock Method of the Lock Object. The Client invokes ExitLock to release the lock.
Clients shall be able to lock the EncoderProbeType Object and to invoke the LatchStart Method although the parent EncoderChannelType Object is locked.
This Method starts the latch capture function of the represented probe. The security constraints defined in chapter 6.6 apply.
Signature
LatchStart (
);
The Method Result Codes (defined in Call Service) are defined in Table 15.
Table 21 – Possible Method Result Codes
|
Result Code |
Description |
|
Good |
The Method execution was successful. |
|
Bad_UserAccessDenied |
The user has not the right to execute the Method. |
|
Bad_Locked |
The EncoderProbeType Object is locked by a different Client’s Session. |
|
Bad_RequiresLock |
The EncoderProbeType Object is not locked. Clients must lock the EncoderProbeType Object before invoking a Method. |
|
Bad_UnexpectedError |
The server is not able to execute the function because an unexpected error occurred. The Device might be temporarily unavailable or unreachable due to network failure. |
The LatchActive Variable contains True if the represented probe’s latch is active, otherwise False.
The LastLatchedPos Variable contains the last latched position of the probe.
The Server might provide the Client with information about changes of the probe’s latch data by sending EncoderProbeLatchEventType Events.