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4.A2CCPU
- - - - - - - - - - - - - - - - - - - MELSEC-A
(2) Switch and connector layout inside the A2CCPUP21/R21
D
I
(12)
MITSUBISHI
BB
A
2CCPU R21
(1)
r--'
11
l -SDA
r---I
12
l -SG
1'---1
IJ
I
-SOB
r---I
1 4
I -RDA
r---I
lSI-ROB
1'---1
16
I-SLO
1'---1
17
I -ERR(+)
1'---1
La
I -ERR(-)
r---I
19
l~
t- - - of
ACl00j2O<lY
110
l
J
r---I
'11
l'
1---;
~r~
\ __---'JJ'''-',
f . _
~
J
-LO
L-ClR
RESET
(14)
(15)
(2)
~
...
~
\
Red leed
Blue leed
101=1
(10)
(8)
(9)
(13)
Battery
(11)
No.
Name
Function
(8)
Memory protect switch
• The switch used to protect the data in the user memory area from being rewritten
mistakenly by operating an external device carelessly .
• For memory protect range, see Section 4.4.1.
Memory Protected
Memory Not Protected
Memory
Memory
[j]2
protect
switch
[1]2
protect swItch
D'
D'
O N ~
O N -
sw
sw
4-88

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