Mitsubishi Electric MELSEC-L Series - Page 106

104
(3) Non-conversion Variable
This element is used to send data in the device memory of a CPU module or buffer memory as a part of a send
packet, or to store a part of a receive packet to the device memory of a CPU module device or buffer memory.
The following table lists the items.
Item Description
Element Name Set name of the element.
Fixed Length/Variable Length
Fixed Length Sends and receives the data whose length is fixed.
Variable Length
When sending: The data length at the time of the protocol execution is
specified and the data is sent.
When receiving: The data of which the length is variable is received.
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 2046.
Unit of Stored Data
Lower Byte + Upper Byte
When sending: Each one word (2 bytes) data in the data storage area is sent in
the order of the lower byte to the upper byte.
When receiving: The receive data is stored to the data storage area in the
order of the lower byte to the upper byte.
Lower Bytes Only
When sending: Each lower byte data in the data storage area is sent.
The E71 ignores data in the upper byte.
When receiving: The receive data is stored to each lower byte in the data
storage area. The E71 stores 00
H
in the upper byte.
Byte Swap Disable/Enable
When sending: When "Enable" is selected, data in the upper byte and lower
byte are swapped by word (2 bytes) and sent.
When "Unit of Stored Data" is "Lower Byte + Upper Byte" and "Data
Length" is an odd number of bytes, the upper byte is sent at transmission
of the last byte.
When "Unit of Stored Data" is "Lower Bytes Only" and "Data Length" is
an odd number of bytes, data without any byte swap is sent at
transmission of the last byte.
When receiving: When "Enable" is selected, data in the upper byte and lower
byte are swapped by word (2 bytes) and sent.
When "Unit of Stored Data" is "Lower Byte + Upper Byte" and "Data
Length" is an odd number of bytes, the last byte is stored to the upper
byte.
When "Unit of Stored Data" is "Lower Bytes Only" and "Data Length" is
an odd number of bytes, the last byte is stored without any byte swap.