YOKOGAWA SMARTDAC+ GP10 - Communication Considerations; About Communication Interval; Access to Non-Existent Data; Special Data

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IM 04L51B01-18EN
Communication Considerations
AboutCommunicationInterval
DataUpdate
The recorder data is updated in a scan interval. Even if a PLC accesses the data at shorter
intervals than the recorder scan intervals, the data is updated only at scan intervals.
Communication Interval
A PLC should access the recorder at intervals of 100 ms or longer.
* This is required to maintain compatibility with other protocols supported by the recorder
than EtherNet/IP.
AccesstoNon-existentData
If non-existent data is accessed, either of the following operations occur.
• 0 is read if non-existent data is read.
• Nothing is done if non-existent data is written.
Specialdata
Special data will have the following values:
Channel status Datatype
Integer(Int) Floating(Float)
+Over, +Burnout Maximum expressible value
+
–Over, –Burnout Minimum expressible value
–
Example: Channel status is “–Over”
Datatype Outputvalue
Int16 –32768 (0x8000)
Int32 –2147483648 (0x80000000)
Float
–
(0xff800000)
WritingDatatotheRecorder
Inputvalue Recorder value
More than 99999999 +Over
–9999999 to 99999999 The data is written without change.
Less than –9999999 –Over