Check Code - Mitsubishi Electric FX5 User Manual

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 Description
Element Name Set the name of the element.
Processing Method Select a calculating method.
• Horizontal Parity
• Sum Check
• 16-bit CRC (for MODBUS)
Code Type • ASCII Hexadecimal
• ASCII Decimal
• HEX
Data Length Select the data length on the line (byte).
The range is 1 to 4.
Data Flow Forward Direction
(Upper Byte  Lower Byte)
Reverse Direction
(Lower Byte  Upper Byte)
Byte Swap
(by Word)
Complement Calculation Select the complement calculation.
• No Complement Calculation
• One's Complement
• Two's Complement
Calculating Start Select the starting element number of the calculating range.
Range The range is 1 to 32.
End Select the ending element number of the calculating range.
The range is 1 to 32.
When Select a format in which a calculated check code is sent.
sending
When Select a format in which data are received.
receiving
When Sends a calculated check code, from the lower byte.
sending
When Handles received data as a check code, from the upper
receiving byte.
When Sends a calculated check code, from the lower byte.
sending
When Receives data from the lower byte.
receiving
When Sends a calculated check code by swapping the upper
sending byte and lower byte by word.
When Receives data by swapping the upper byte and lower
receiving byte by word, and handles as a check code.
6 PREDEFINED PROTOCOL SUPPORT FUNCTION
6
Remarks

For calculation
procedure, refer to
following .
Page 225
Page 227
Page 229
Not settable when
Processing Method is
16-bit CRC (for
MODBUS).
Not settable when
Processing Method is
16-bit CRC (for
MODBUS).
Not settable when
Processing Method is
16-bit CRC (for
MODBUS), or when the
Data Length is set to 1
(byte).
Not settable when
Processing Method is
16-bit CRC (for
MODBUS), or when the
Data Length is set to 1 to
3 (byte).
Not settable when
Processing Method is
16-bit CRC (for
MODBUS).
Refer to Page 230.
189
6.7 Packet Setting