Mitsubishi Electric MELSEC iQ-R Series User Manual page 49

Non-verified reception
Use this element when received data includes unnecessary data while receiving data.
C24 skips characters as many as the specified number if a receive packet includes a non-verified reception.
Item Description
Element Name Set a name of the element.
Data Length 0 (variable number of
characters)
1 to 2048 (specified
number of characters)
Precautions
• When "Data Length" is '0', the following requirements need to be met.
■Only one Non-verified reception can be placed in a packet.
■Include a Non-verified reception in the calculating range of a Length. Otherwise, place any of the following data immediate after a Non-verified reception.
• Static Data
• Terminator
• Check code + Static Data
• Check code + Terminator
■Two or more of the following four elements cannot be placed in the same packet.
• Conversion variable (Variable number of data)
• Conversion variable (Fixed number of data and Variable number of digits) (Excluding a case when the number of data is '1' with delimiter.)
• Non-conversion variable (Variable length)
• Non-verified reception (Variable number of characters)
• In received packet data from target devices, C24 needs to be able to discriminate data corresponding to a Non-verified
reception from those of a Terminator or a Static Data following a Non-verified reception. The receive processing may not be
performed normally if they cannot be distinguished.
Ex.) When value of a Terminator or value of a Static Data following a Non-verified reception is used in a Non-verified reception, C24 recognizes it as data
of a Terminator or a Static Data following a Non-verified reception and performs the verify/receive process.
Set this item when the number of characters not to be verified varies in each of communication.
Set the number of characters not to be verified.
2 DATA COMMUNICATION USING PREDEFINED PROTOCOL
2
47
2.3 Packet