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3.
LINKING TO THE A2CCPU
MELSEC-A
3.6
Error Detection
The following figure shows how an error is detected when an A2CCPU and
an A64RDC are used together.
A2CCPU
A64RDC
PRC instruction execution
Error code storage area
clear
+
Dg180
Write data error code
D9181
D9182
D9193
I
I
Communications error-detected
flag X(n+4)
I
-
Error-detection reset Y(n
+
4)
Transmission execution
(instruction data, write data)*
-. .
4
ON*
Internal processing
1
ata error detection
Buffer
Zero clear
of address 18
A64RDC is reset
X(n+4)
goes
OFF
I
*
Processing marked by an asterisk is executed
by the sequence program.
3-
28
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