Omron CX-Supervisor User Manual page 241

Performance Monitor
240
SECTION 16 Application Analysis / Performance Monitor
Actual CPS
Average Active Points/
Sec
Average Active Elements/
Sec
Calculated Max Points/
Sec
Calculated Max
Elements/Sec
PLC Average Latency
(ms)
Processing Delay
(ms)Processing Time
(ms)
Read Time (ms)
Write Time (ms)
Max Read Time (ms)
Max Write Time ms)
RX Bytes (CX-
Supervisor)
RX Bytes/Sec (CX-
Supervisor)
RX Heartbeat Interval
(ms)
RX Average Heartbeat
Interval (ms)
RX Average Heartbeat
Deviation (ms)
Theoretical Max CPS
The number of characters per second being used
on the network, if this is approaching the same
value as the theoretical CPS (60% or higher) then
network problems are likely.
This is how many points/elements are being
updated every second - if all points are at 1
second interval, the calculation would be 1 and the
Average should be very close to this. If you have 2
points at 0.5 seconds, the calculation would be 2...
If the Average and Calculation differ considerably
then there is a problem with bandwidth use.
The average time it takes the PLC to process its
own programs and any other requests of it before
responding to a particular request.
This is the time used by CX-Supervisor
applications, if these values are too high it would
indicate the processing required by your
application (e.g. scripts) is too much and you need
to think more about the design of your application.
This is the time it takes CX-Supervisor to read or
write a point on the PLC, the lower this number the
better performance you are getting. If you are
overloading the network, this value will increase
and the heartbeat interval will also be too high
The number of bytes received by CX-Supervisor
from CX-Server
The number of bytes per second received by CX-
Supervisor from CX-Server, this should be well
below the bandwidth of the chosen networks
capacity. Also take into account other bandwidth
use such as received data and other unrelated
network traffic
If you have an Input point at 1 second this is used
as a heartbeat. If there is no point at this rate there
will be no monitor of heartbeat interval. This is so
the measure doesn't actually affect the
performance.
The average heartbeat should be about 1000 with
the deviation as low as possible. If this number is
much more than 1000 then this would indicate a
communications problem. Even if you don't notice
in normal use, CX-Supervisor is communicating
faster than the network bandwidth or infrastructure
can cope with and performance is suffering.
An assumed maximum CPS possible for the
particular network, this is a rough calculation and
is only used as a guide. It does not take into
account other network traffic or differences
between throughput of different PC network cards.