Yokogawa Standalone MW100 - Manual (Page 282)

App-8
IM MW100-01E
Checking the Communication Status
You can view log information to check the status of Modbus communications.
Modbus communication log information
You can check the status of communication and
other information by selecting items here.
For information about displayed contents, see
the MW100 Communication Command Manual
(IM MW100-17E).
Register Data Types
The figure below describes specification of data types for registers used during Modbus
communications. Registers are fixed to 16-bits in length. Data longer than 16 bits
are stored using multiple registers. In this case, the data sequence (Endian) must be
specified. The MW100 can process 32-bit data. Specify “Little” to store data from the
least significant byte, and “Big” to store data from the most significant byte.
Register Assignment Data Type
Data Type
Specification
30001 Signed integer (16bit) Int16 ----- Int16
30001 Unsigned integer (16bit) UInt16 ----- UInt16
30001 Signed integer (Lower 16bit) Int32 ----- Int32 - Little
30002 (Upper 16bit)
30001 Signed integer (Upper 16bit) Int32 ----- Int32 - Big
30002 (Lower 16bit)
30001 Unsigned integer (Lower 16bit) UInt32 ----- UInt32 - Little
30002 (Upper 16bit)
30001 Unsigned integer (Upper 16bit) UInt32 ----- UInt32 - Big
30002 (Lower 16bit)
31001 Floating point
real number (Lower 16bit) Float ----- Float - Little
31002 (Upper 16bit)
31001 Floating point
real number (Upper 16bit) Float ----- Float - Big
31002 (Lower 16bit)
* MW100 data are all Little Endian, and assigned to Modbus registers. When loading MW100
data, specify “Little.”
For the available MW100 register numbers, Modbus protocol specifications, and other
information, see "Modbus Protocol Specifications" in section 5.2 of the MW100 User’s
Manual (IM MW100-01E).
Appendix 2 Setting Data Communication That Uses Modbus Protocol