User`s manual

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CHAPTER 2 USING THE PROGRAMMABLE CONTROLLER CPU MONITORING FUNCTION
2
2.2 About the Programmable Controller CPU Monitoring Function
2.2.4 Timings of transmission and notification of monitoring results
to the external device
The following explains the timings for the transmission and notification of the programmable controller CPU monitoring
results.
There are two transmission methods for transmitting and notifying the monitoring results of the local station
programmable controller CPU to the external device. These include constant cycle transmission and condition
agreement transmission. One of these methods must be selected by the user during programmable controller CPU
monitoring registration.
(1) Constant cycle transmission
The monitoring results are transmitted and notified each time monitoring information is read from the
programmable controller CPU.
(Timing to transmit data)
(2) Condition agreement transmission
(a) For device monitoring, the monitoring conditions registered by the user (conditions
for sending monitoring results), the monitoring condition values and the monitoring
information read from the programmable controller CPU are compared. The
monitoring results are sent or notified when there is a block where the monitoring
conditions match.
For programmable controller CPU status monitoring, the monitoring results are sent or notified only once when
an error is detected for the first time from the status information read from the programmable controller CPU.
(This corresponds to the edge triggered transmission noted below.)
END
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Constant cycle
transmission
Cycle time
Sequence program
External device
One-block
portion
One-block
portion
Monitoring information
…