Omron SYSMAC CV Series Operation Manual page 477

Cycle Time
Peripheral Servicing Cycle Time
Processes
Basic Checks the CPU bus, PC memory,
processes battery, start input, and updates the clock.
CPU Bus Unit Starting from Unit #0, events (requests for
servicing non-scheduled data processing) are
processed to refresh BASIC Unit and
Personal Computer Units.
Peripheral If a peripheral Device is connected,
Device commands from it are processed.
servicing
Host interface Commands from computers connected
servicing (Pin 3 through the host interface are processed.
of DIP switch
OFF)
NT link The NT link is serviced when a PT is
servicing (Pin 3 connected to the CPU and the NT link is
of DIP switch being used.
ON)
Interrupt Refresh
Processing
Process
SYSMAC NET The data link words allocated to SYSMAC
Link refreshing NET Link Units are refreshed.
SYSMAC LINK The data link words allocated to SYSMAC
refreshing LINK Units are refreshed.
SYSMAC Masters receive I/O data from Slaves.
BUS/2
refreshing
CPU Bus Link Data in the CPU Bus Link Area is
refreshing refreshed.
466
Actions
Depending on the program, the following interrupt processes might be executed
in addition to the processes detailed in the table above. The actual cycle time is
the sum of the cycle time calculated in the table above and the time required for
the processes in the table below.
Actions
Processing time
CV500/CVM1-CPU01-EV2
Approx. 2.8 ms
Approx. 1 ms for event processing; approx. 0.8 ms for
BASIC Unit refreshing; and approx. 0.8 ms for Personal
Computer Unit refreshing.
1.2 ms
1.2 ms
Fixed at 2.2 ms
Processing time
CV500/CVM1-CPU01-EV2
µ
Approx. 1.4 ms + 1 s per data link word, add 0.3 ms if
both DM and CIO are used for data links.
µ
Approx. 1.4 ms + 1 s per data link word, add 0.3 ms if
both DM and CIO are used for data links.
µ
Approx. 2.0 ms plus 1 s per word refreshed
0.8 ms every 10 ms (when the PC is set to use the CPU
Bus Link Area in the PC Setup)
Section 6-2
CV1000/2000/
CVM1-CPU11/21-EV2
CV1000/2000/
CVM1-CPU11/21-EV2