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3. LINKING TO THE A2CCPU
MELSEC-A
3.3
I/O Signals Handled with an
A2CCPU
Functions of the control I/O signals handled between an A64RDC and the
A2CCPU are described in this section. Devices X refer to the input signals
from the A64RDC to the A2CCPU. Devices Y refer to the output signals from
the A2CCPU to the A64RDC.
Table 3.1 List of A64RD3C I/O Signals
Signal Direction
: A64RD3C
-
A2CCPU Signal Direction
: A2CCPU
-c
A64RD3C
I
Device
No.
I
Description
I
Device
No.
X(n+O)
Y(n+O)
to
Unusable
X(n+3)
Y(n+3)
FROMnO instruction error
detection flag
I
X(n+5)
Reset switch ON-detected flag
Y(n+5)
I
X(n+6)
Unusable
X(n+7)
Communications-completed
response wait flag
X(n+8)
X(n+l7)
X(n+l8)
READY
flag
to
Unusable
Y(n+6)
Y(n+7)
I
to
X(n+l9)
c H 1 :
D-scalnection
detechl nag
Y(n+8)
Y(n+l
F)
X(n+l
A)
CH2
: Dixonnecbn detecth flag
X(n+l
5)
CH3 :
Cisconnection
detection flag
I
F)
1
Unusable
X(n+l
D)
3-7
Description
Unusable
Errordetection reset
Reset switch ONdetected flag
reset
Unusable
Communications reset
Unusable
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