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8.7 Cyclic Data Update Watch Function
The update intervals of cyclic data are monitored. The last output value is held or cleared when the cyclic transmission
stop status continues longer than the set monitoring time.
The cyclic transmission stop status is the status that the D LINK LED is flashing (Data link in operation (cyclic
transmission stopped)) or off (Data link not performed (disconnected)).
Set whether to hold or clear the output value using the digital output HOLD/CLEAR setting function and the analog
output HOLD/CLEAR setting function.
For the digital output HOLD/CLEAR setting function, refer to the following.
• Digital output HOLD/CLEAR setting function ( Page 117, Section 8.15)
For the analog output HOLD/CLEAR setting function, refer to the following.
• Analog output HOLD/CLEAR setting function ( Page 82, Section 8.6)
(1) Setting procedure
1. Set "Parameter write" for "Method selection".
"CC IE Field Configuration" window Select a D/A converter module in "List of stations".
[CC IE Field Configuration] [Online] [Parameter Processing of Slave Station]
2. Set "CH D/A conversion enable/disable setting" to "0: Enable".
3. Set the monitoring time in "Cyclic data update watch time setting".
● Set the greater value for the cyclic data update watch time setting than that of the link scan time.
● While the synchronous communication mode is enabled, the setting of Cyclic data update watch time setting is ignored.
Item Setting range
Cyclic data update watch time setting
• 0 (Not monitor)
• 1 to 20 (0.1 to 2 seconds in units of 100ms)
Master station
Remote device
station
The cyclic data are updated within
the data link update time.
Cyclic data
When the cyclic data update interval
exceeds the set time, the output falls
into the HOLD/CLEAR status.
Monitoring starts when cyclic data
are received for the first time.
Cyclic data update
watch time setting