Yokogawa DAQWORX - Manual (Page 39)

3-8 IM WX1-07E
Output Processng
Output request from client
Storage buffer for
output request
Output executed Acquisition executed
Checked at 1 second intervals
Instrument
Functon
• The output request from the client is stored in the output request storage buffer.
• The output request storage buffer is checked for an output execution every second,
and output is executed on the instrument if an output request is found. Then, the
output request storage buffer is cleared.
• Output request storage buffer is set to hold the most recent value, so if multiple
writings to the same tag occur during the confirmation interval, the written value
becomes the most recent one.
• An instrument is either outputting or acquiring, and acquisition execution is put on
hold until output execution is finished, and vice versa. Therefore, acquisition or output
execution may be delayed.
Also, time may be required for output execution. If so, it can occur more slowly than
the one-second confirmation interval.
Wrtng of the SP Value
During output execution, SPNO is acquired from the instrument. SP value output is
executed on the register corresponding to this SPNO.
3.3 Detals on Functons