Omron SYSMAC CV Series - Page 477

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