Omron CJ1G-CPU series, Programming Manual

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CPU Processing Modes Section 6-8
are for a program consisting of basic instructions with a cycle time of 10 ms
and with one Ethernet Unit. These values are provided for reference only and
will vary with the system.)
Note 1. Peripheral servicing includes 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 periph-
eral and RS-232C ports (but not including data links and other special I/O
refreshing for CPU Bus Units).
2. The CS1 CPU Units of version 1 or later and the CS1-H or CJ1-H CPU
Units also support a Peripheral Servicing Priority Mode that will perform
peripheral servicing at a fixed cycle during program execution. It will pro-
vide faster peripheral servicing than the normal processing mode, but pro-
gram execution will be slower. Event response, however, will not be as fast
as the Parallel Processing Modes. Parallel Processing with Asynchronous
Memory Access should thus be used whenever response to events is to
be given priority in processing.
3. Peripheral servicing cycle time over errors can occur in the CPU Unit when
parallel processing is used. If the peripheral servicing cycle time exceeds
2.0 s for a CS1-H or CJ1-H CPU Unit, this error will occur and A40515 will
turn ON and operation will stop (fatal error). 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
100 if the peripheral servicing cycle time exceeds 1 s (i.e., if the contents
of A268 exceeds 2710 Hex (10000 decimal)).
The Programming Console should be disconnected when user applica-
tions are being run in a parallel processing mode. The Programming Con-
sole will be allocated servicing time to increase the response to
Programming Console keys, and this will increase the peripheral servicing
time and reduce the effectiveness of parallel processing.
Item Normal Mode Parallel Processing with
Asynchronous Memory
Access
Parallel Processing
with Synchronous
Memory Access
Cycle time Arbitrarily set to 1 0.9 0.9
Peripheral
servicing Arbitrarily set to 1 0.4 1.0
FAL
1
#0000
>
A268
&10000
A user-defined error will be generated
with FAL number 100 by FAL(006) is the
peripheral servicing cycle time exceeds
1 s.