Mitsubishi MELSEC LJ71C24, User Manual

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9 DATA COMMUNICATION USING THE PREDEFINED PROTOCOL
(5) Non-conversion Variable
Use this element to send the data in the device memory of a CPU module or
buffer memory as a part of a send packet, or store a part of a receive packet to
the device memory of a CPU module device or buffer memory.
The following lists the items.
Item Description
Element Name Set a name of the element.
Fixed Length
Sends and receives the data whose length is fixed.
Fixed Length/Variable
Length
Variable Length
When sending: Specifies the data length at the time of the
protocol execution and sends data.
When receiving: Receives data of which the length is variable.
Data Length/ Maximum
Data Length
Set the length of data to be sent and received.
(For the variable length data, set the maximum data length that can be specified to the data
length storage area.)
The range is 1 to 2048.
Lower Byte + Upper Byte
When sending: Sends each one word (2 bytes) data in the data
storage area in the order of the lower byte to the
upper byte.
When receiving: Stores the receive data to the data storage area
in the order of the lower byte to the upper byte.
Unit of Stored Data
Lower Bytes Only
When sending: Sends each lower byte of data in the data storage
area.
The C24 ignores data in the upper byte.
When receiving: Stores the receive data to each lower byte in the
data storage area.
The C24 stores 00
H
in the upper byte.