We are reading 4 external counting signal and 1 internal 32 Khz clock simultaneously, via a FP-CTR-500 and a VisualBasic app

Question

lication with OPC server. Can we assure that the time of reading of values for all the channels is the same?. We need to compare those 4 external counting values between them, using the 32 Khz internal clock like a time base reference. Can anybody help us?The timing of reading from the VisualBasic application is 2 seconds, and external pulses are incoming at 8 Khz aprox.

Answer 1

lication with OPC server. Can we assure that the time of reading of values for all the channels is the same?. We need to compare those 4 external counting values between them, using the 32 Khz internal clock like a time base reference. Can anybody help us?Eduardo,
The FP-1600 should be sending data is relatively synchronized to the OPC Server. However, since items containing multiple analog/count channels are not allowed in the OPC Server, the OPC Server is treating the channels as separate channels and may not be transmitting the data simultaneously.
The more complete picture looks like this: The FP-1600 reads all 6 channels of the FP-CTR-500, it compares each value to the configured deadband and places any values that have changed in the transmit queue, it then does the same thing for any other I/O modules on the system. Following the scan of the entire bank, it transmits all of the changed data to the client computer. It then starts scanning the bank and the process repeats. The OPC Serv
er on the client computer breaks the data down by channels into the appropriate memory locations. An OPC Client will establish separate requests for each channel. Thus a client may sequentially request data from separate channels and may get data from different times if the OPC Client has updated channels between responding to one data request and then the next.
Regards,
Aaron