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CPU Processing Modes Section 6-8
a) If the peripheral servicing cycle time exceeds 2.0 s, a cycle time over
error will occur. The peripheral servicing cycle time can be monitored
in A268 to detect possible errors before they occur. For example, a
user-defined error can be generated using FAL number 001 if the pe-
ripheral servicing cycle time exceeds 1 s (i.e., if the contents of A268
exceeds 2710 Hex (10000 decimal)).
b) A peripheral servicing cycle time over error can also occur if the pro-
cessing time for the instruction execution cycle (i.e., the instruction ex-
ecution time) is too short. This time is stored in A266 and A267 in
normal execution mode. As a guideline, if the instruction execution
time is 2 ms or less, a peripheral servicing cycle time over error will oc-
cur and the parallel processing mode cannot be used. When debug-
ging only sections of the program (which can cause a very short
instruction execution time), use normal mode to prevent this error from
occurring.
The Programming Console should be not be used when user applications
are being run in a parallel processing mode. The Programming Console
will be allocated servicing time to increase the response to Programming
Console keys, and this will increase the peripheral servicing time and re-
duce the effectiveness of parallel processing.
PLC Setup
When using the CX-Programmer, make the settings on the Peripheral Service
Tab Page.
FAL
1
#0000
>
A268
&10000
A user-defined error will be generated
with FAL number 001 by FAL(006) is the
peripheral servicing cycle time exceeds
1 s.
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