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11 INSTRUCTIONS AND FUNCTIONS
Processing Code 64
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Reading causes of reception errors
Control table format definition
Element position
Item
%(0)
Processing code
%(1)
Error causes
• It is possible to read the causes of errors (parity, overrun, or framing errors) that
have occurred in an open communication channel using this code.
• Specify 64 for the processing code.
• The reception error causes are expressed in the following manner using the
lower 8 bits of %(1).
7
6
5
It is convenient to use the RDSET instruction to read the bits since only
the 3rd, 4th, and 5th bits of
%(1)
Description
Specify the processing code.
Read the causes of reception errors into the
lower byte.
4
3
2
1
0
(Bits marked with X are ignored.)
Parity error
Overrun error
Framing error
%(1) are used for the status of each signal.
Lower byte
Can be read by the instruction
RDSET(3,
Can be read by the instruction
RDSET(4,
Can be read by the instruction
RDSET(5,
MELSEC-Q
1: Error
0: No error
%(1)).
%(1)).
%(1)).
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