Yokogawa PC-Based MX100 - Manual (Page 1227)

App-6
IM MX190-01E
FIFO
The operation of writing measured data to the FIFO buffer.
On the MX100, the FIFO must be started to retrieve measured data.
The user can specify the starting and stopping of the FIFO. The FIFO can also be
set to auto control.
In the case of the MX100, the FIFO is divided up by measurement interval type.
Each type is identified by the FIFO number.
The measurement interval and FIFO structure are as follows.
• Measured data from input modules of the same measurement interval are
acquired in the order of the channel numbers of the same FIFO.
• Interval numbers (FIFO numbers) are assigned starting from the shortest
measurement interval.
• Writing to the FIFO (data buffer) is handled according to the data number updated
each measurement.
• Data readout is performed by specifying FIFO numbers and data numbers.
• The range of data that can be read out is provided using the data numbers.
Auto Control
The FIFO is stopped when a setup command is executed while the FIFO is running.
When auto control is enabled, the FIFO is automatically started after the execution
of the setup command is complete.
Data Number
A sequential number applied to stored data in the order of measurement.
The number is different for each FIFO number.
FIFO Number
A number assigned to the FIFO.
A number is assigned to measurement interval types in order of speed.
It is an integer value between 0 and 2.
Numbers are defined.
Appendix 1 MX100 Terminology