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5. LINKING TO AN ACPU AND AN AJ71 PT32-S3
MELSEC-A
5.8
Error
Detection
The following figure shows the detection procedure if an error occurs when
an ACPU,
AJ71
PT32-S3, and A64RDC are used together,
ACPU
AJ71 PT32-S3
TO instruction executior
Request-to-send
-
signal Y (n
+
0)
Remote
terminal
module error X(n+24
detection
I
Data register
Remote terminal
faulty station
Remote terminal
No. 1 error code
Remote terminal
module error
detection reset
signal
Y(n+24)
(Automatically goes
ON when X(n+24) is
turned ON.)
1
"0"
is written to address
18 of the A64RDC.
Write execution
command data'
write data
'
ON
t
*ON
*
Remote terminal
senddata areas
L
T
detection
G - e F 9
WDT error
-
1
I
Error code
storage area
No. 1 error code
Remote terminal
No. 2 error code
No. 3 error code
209
I
Remote terminal
No. 14 error code
X(n+24) goes OFF
Remote terminal
send-data areas
I -
t - - - - - - - - - - - I
'ransmission
!xecution
,
command data
write data
?emote terminal
'aulty station No.
A64RDC
Internal processing
Data error detection
Buffer
address 18
*All processing marked by an asterisk is executed by the sequence program.
5 -
34
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