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Mitsubishi Electric FX5 User Manual page 58

Melsec iq-f series, ethernet communication
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When "Fixed Length/Variable Length" is "Variable Length" and the configuration is set as follows, an error
occurs:
• An element other than static data is placed behind a non-conversion variable element when non-conversion
variable is out of the length calculating range or when there is no length element (except for when
nonconversion variable is placed at the end of the packet elements).
• Multiple non-conversion variable elements are placed in the length calculating range, while a length element
is not placed.
• A non-conversion variable element is placed before a length element in the length calculating range.
Non-verified reception
Use this when receive data include unnecessary data.
If the receive packet contains non-verified reception, CPU module skims over the specified number of characters.
Multiple non-verified reception elements can be set in one packet.
The following table lists the items.
Item
Description
Element Name
Set the element name.
Data Length
0 (Number of characters
variable)
1 to 2046 (number of
character specification)
When "Data Length" is set to 0, an error will occur if the following layout is used.
• An element other than static data is placed behind a non-verified reception element when non-verified
reception is out of the length calculating range or when there is no length element (except for when non-
verified reception is placed at the end of the packet elements).
• Multiple non-verified reception elements are placed in the length calculating range, while a length element is
not placed.
• A non-verified reception element is placed before a length element in the length calculating range.
6 PREDEFINED PROTOCOL SUPPORT FUNCTION
56
6.3 Packet Elements
Set when the number of characters that are not verified differs between each communication session.
Set the number of characters that are not verified.

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