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<< Click to Display Table of Contents >> OPC - PC Specification/Performance |
  
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<< Click to Display Table of Contents >> OPC - PC Specification/Performance |
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To provide some idea of the overhead that OPC puts on a PC we ran SpecView (build #693) and created project that included a Eurotherm 2404 connected to running iTools running on the same PC.
Operating System |
Processor |
Memory (Mb RAM) |
Time taken to for OPC Browser to appear |
Time taken to load up the Eurotherm.ModbusServer.1 with Groups and Items in the OPC Browser |
Time taken to create an instrument for the 2404 with 4,438 parameters |
Windows XP |
AMD Athlon 1100 |
256 |
< 1 second |
< 1 second |
16 seconds |
Windows 2000 |
Pentium III 450 |
380 |
3.3 seconds |
3.8 seconds |
34.1 seconds |
Windows 98 |
Pentium I 100 |
48 |
5.8 seconds |
1 minute 39 seconds |
3 minutes 54 seconds |
The above test was used to give a worse case scenario – it is doubtful that any user would put 4,438 parameters on open GDW's. However it is good at pointing out that using a good specification of PC is worthwhile.
Debugging
SpecView can generate debug messages for errors generated by the OPC Browser. To turn debugging on or off use Preferences - Debug from the File menu.
SpecView Error Codes
You will see these if you have turned debugging on and look at the debug.txt file in your project folder e.g. C:\SV3\Furnace
Error code |
Description |
Meaning |
18219 |
OPC Server status cannot be obtained |
The OPC Server must be shutdown and restarted. |
18229 |
OPC Server status indicates not running normally |
The OPC Server must be shutdown and restarted. |
The explainations for other codes are in Error Codes and Error Codes Protocol Specific.
OPC Error Codes
You will see these if you have turned debugging on and look at the svdata.txt file in your SpecView installation folder e.g. C:\SV3
Error code (in hex) |
Description |
Meaning |
0004000D |
OPC_S_UNSUPPORTEDRATE |
The OPC Server cannot handle the scan rate in your project. Change the scan rates in File->Preferences under the Runtime tab and retry. |
80010108 |
RPC_E_DISCONNECTED |
The OPC Server has gone off line. Go into Edit Mode or exit SpecView. Then OPC Server must be shutdown and restarted. Then go online to SpecView. |
80040154 |
REGDB_E_CLASSNOTREG |
Update to build #693 or above. If you are using a build of #693 or above then contact your SpecView representative to pass on your svdata.txt. |
800706BA |
RPC_S_SERVER_UNAVAILABLE |
OPC Browser is trying to connect to remote OPC Server. OPC Browser cannot connect to remote OPC Server as either it is not running or you do not have security access to it or access to DCOM. |
800706D3 |
RPC_S_UNKNOWN_AUTHN_SERVICE |
OPC Browser is trying to connect to remote OPC Server. OPC Browser cannot connect to remote OPC Server, as you do not have security access to it or access to DCOM. |
C0000005 |
Unknown |
Shutdown and restart your OPC Server. |
C0040007 |
OPC_E_UNKNOWNITEMID |
Contact your SpecView representative to pass on your svdata.txt. |
C004000C |
OPC_E_DUPLICATENAME |
Contact your SpecView representative to pass on your svdata.txt. |
Further information
Microsoft’s article Q174024 “DCOM95 Frequently Asked Questions”