Advertisement
4. LINKING TO THE AnACPU (WITH DEDICATED INSTRUCTIONS)
AND THE AJ71 PT32-S3
MELSEC-A
4.8
Error Detection
The following diagram shows the detection procedure if an error occurs when
an AnACPU, AJ71 PT32-S3, and A64RDC are used together.
AnACPU
AJ71 PT32-S3
Write execution
command data
write data
PRC instruction execution
Remote
terminal
module error X(n+24)4
detection
Data register
faulty station
I
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.
-
I
I
"0' is written to address
18 of the A64RDC.
Remote terminal
send-data areas
\
/
WDT error
Address
7
195
196
197
198
1
Error code
storage area
Remote terminal
faulty station
Remote terminal
No. 1 error code
Remote terminal
No. 2 error code
Remote terminal
No. 3 error code
209
I
Remote terminal
No. 14 error code
Remote terminal
send-data areas
l-
Transmission
execution
command data
write data
Remots terminal
faulty station No.
A64RDC
Internal processing
X
Data error detection
I
Buffer memory
address 18
All processing marked by an asterisk is executed by the sequence program.
4- 38
Advertisement
