301
CPU Processing Modes Section 6-8
This function can be used when only system FAL errors need to be stored in
the error log, e.g., when there are many user-defined errors generated by the
program using FAL(006) and these fill up the error log too quickly.
PLC Setup
Note The following items will be stored in the error log even if the above setting is
used to prevent user-defined FAL errors from being recorded.
• User-defined fatal errors (FALS(007))
• Non-fatal system errors
• Fatal system errors
• User-simulated nonfatal system errors (FAL(006))
• User-simulated fatal system errors (FALS(007))
6-8 CPU Processing Modes
6-8-1 CPU Processing Modes
Normally, peripheral servicing (see note) is performed once at the end of each
cycle (following I/O refresh) either for 4% of the cycle or a user-set time for
each service. This makes it impossible to service peripheral devices at a rate
faster than the cycle time, and the cycle time is increased by the time required
for peripheral servicing.
With the CS1-H or CJ1-H CPU Units, however, Parallel Processing Modes
are supported that enable processing program execution in parallel with
peripheral servicing. These modes enable faster peripheral servicing and
shorter cycle times, especially when there is extensive peripheral servicing
required. (CJ1M CPU Units do not support the Parallel Processing Modes.)
Note Peripheral servicing includes non-schedule services required by external
devices, such as event servicing (e.g., communications for FINS commands)
for Special I/O Units, CPU Bus Units, and Inner Boards (CS Series only), as
well as communications port servicing for the peripheral and RS-232C ports
(but not including data links and other special I/O refreshing for CPU Bus
Units).
Programming
Console
address
Name Setting Default CPU Unit
refresh
timing
Word Bit
129 15 User FAL
Storage
Setting
0: Record user-defined FAL
errors in error log.
1: Don’t record user-defined
FAL errors in error log.
0:
Record
Whenever
FAL(006) is
executed
(every
cycle)
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