Check Code - Mitsubishi MELSEC iQ-F FX5 User Manual

■A data that cannot be distinguished between Terminator or a Static data
In received packet data from counterpart devices, CPU module needs to be able to distinguish data corresponding to a
conversion variable from those of a Terminator or a Static data following a Conversion variable. The reception processing may
not be performed normally if they cannot be distinguished.
Ex.
When the value of terminator or a static data following the conversion variable is used as a conversion variable, CPU module
recognizes it as a terminator or a fixed data following the conversion variable, verifies, and performs reception processing.

Check Code

Use this element when an element indicating check code data is included in a packet.
CPU module automatically calculates a specified check code at timing of sending/receiving, and adds it to a send packet or
detects an error of a receive packet.
Window
Item
Element Name
Processing Method
Code Type
Data Length
7 PREDEFINED PROTOCOL SUPPORT FUNCTION
212
7.7 Packet Setting
Description
Set the name of the element.
Select a calculating method.
• Horizontal Parity
• Sum Check
• 16-bit CRC (for MODBUS)
• ASCII Hexadecimal When
• ASCII Decimal sending
• HEX
When
receiving
Select the data length on the line (byte).
The range is 1 to 4.
Select a format in which a calculated check code is sent.
Select a format in which data are received.
Remarks

For calculation
procedure, refer to
following .
Page 249
Page 251
Page 253
Not settable when
Processing Method is
16-bit CRC (for
MODBUS).
Not settable when
Processing Method is
16-bit CRC (for
MODBUS).