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OPC data refresh slow

Dear all

 

 I use the OPC connection with the Omron CS1 PLC, PC prepared to use Labview 8.6.1, the connection points over 2500 points, the database is SQL2005,

 

 industrial-site host computer is Advantech's IPC, 845 motherboard , Pentium 2.4G of the CPU, 1G memory. We use shared variables and OPC tag binding

 

 way to communicate. OPC Server refresh to 100ms. Now problem is: in the PC side, some analog data refresh needs  about 4-6 seconds,  what can I do

 

for improve the update?

Labview 7.0, 8.0, 8.6,8.6.1,2011
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