YOKOGAWA F3YP14-0N, User Manual

Page: 50 / 127

5-1
IM 34M6H55-02E 1st Edition : Apr.1.2002-00
5. Status
Status refers to data which the CPU module reads from the positioning module. You can
check the state of the positioning module using the status and input relays.
CAUTION
When the CPU module reads 2-word data from the positioning module, concurrency of
the high-order word and low-order word of 2-word data is not assured due to conflicts
between the timing of reading from the CPU module and the data update period of the
positioning module.
To ensure that the high-order word and low-order word of 2-word data are concurrent
when reading from a sequence CPU, use the READ command to read the data twice
consecutively and verify that the data read are the same in both instances. If the HRD
command is used, data concurrency is not assured even if you confirm that the data are
the same.
When reading from a BASIC CPU, concurrency is not assured because the time
required to read 2-word data is longer than the data update period of the positioning
module.