Length - Mitsubishi MELSEC iQ-F FX5 User Manual

Length

Use this element when an element indicating the data length is included in a packet.
• When sending: Calculates the data length of a specified range, and adds the result to a send packet.
• When receiving: Verifies the data (value) corresponding to the length in the received data as the data length of the specified
range.
For data examples of length, refer to Page 241 Data examples of Length.
Window
Item
Element Name
Code Type
Data Length
Data Flow
Calculating Start
Range
End
Considerations for configuring packet element
• Only one terminator can be used in a packet.
• To configure the length, one or more other elements are needed.
7 PREDEFINED PROTOCOL SUPPORT FUNCTION
202
7.7 Packet Setting
Description
Set the name of the element.
Select a format of the data length.
• ASCII Hexadecimal
• ASCII Decimal
• HEX
Select the data length on the line.
The range is 1 to 4.
Forward Direction When
(Upper Byte→Lower Byte) sending
When
receiving
Reverse Direction When
(Lower Byte→Upper Byte) sending
When
receiving
Byte Swap When
(by Word) sending
When
receiving
Select the start packet element numbers for the calculating range.
The range is 1 to 32.
Select the last packet element numbers for the calculating range.
The range is 1 to 32.
Sends a calculated length from the upper byte.
Receives data from the upper byte.
Sends a calculated length from the lower byte.
Receives data from the lower byte.
Sends a calculated length swapping the upper byte and
lower byte by word.
Receives data swapping the upper byte and lower byte
by word.
Remarks



Data flow setting is
invalid when data length
is 1 byte.
Data flow setting is
invalid when data length
is 1 to 3 byte.
Refer to Page 243.