Yokogawa Standalone MW100 - Manual (Page 18)

4.5 Communication Considerations
About Communication Interval
Data Update
The DX Advanced and MW100 data is updated in a scan interval. Even if a PLC accesses the data at shorter
intervals than the DX or MW100 scan intervals, the data is updated only at scan intervals.
Communication Interval
A PLC should access the DX or MW100 at intervals of 125 ms or longer. * This is required to maintain
compatibility with other protocols supported by the DX than EtherNet IP.
Access to Non-existent Data
If non-existent data is accessed, either of the following operations occurs. • 0 is read if non-existent data is read.
Nothing is done if non-existent data is written.
When the DX Data Type Differs from the Data Type Specified in a Command
Each data set on the DX/MW100 has a fixed data type. Data on the DX/MW100, which includes special data,
accessed using the same data type is transmitted unchanged. Data on the DX/MW100 accessed using a different
data has its data type converted. The following explains the conversion rules:
4.3 DX Instance ID Map for Implicit Messaging
4.4 MW100 Instance ID Map for Implicit Messaging
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