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2. SYSTEM CONFIGURATION
2 - 20
MELSEC-A
2.4 General Description of System Configuration
2.4.1 Outline of AnSHCPU configuration
The following gives the system configuration, number of inputs/outputs, I/O number
allocation, etc. when the AnSHCPU is used as an independent system.
System configuration
150
to
15F
Extension cable
0
00
to
0F
1
10
to
1F
2
20
to
2F
3
30
to
3F
4
40
to
4F
5
50
to
5F
6
60
to
6F
7
70
to
7F
Main base unit (A1S38B)
Slot number
CP
U
P
o
we
r su
p
p
ly
mo
d
u
le
24
180
to
18F
25
190
to
19F
26
1A0
to
1AF
27
1B0
to
1BF
28
1C0
to
1CF
29
1D0
to
1DF
30
1E0
to
1EF
31
1F0
to
1FF
Extension base unit (A1S68B-S1)
P
o
we
r su
p
p
ly
mo
d
u
le
8
80
to
8F
9
90
to
9F
10
A0
to
AF
11
B0
to
BF
12
C0
to
CF
13
D0
to
DF
14
E0
to
EF
15
F0
to
FF
Extension base unit (A1S58B-S1)
16
100
to
10F
17
110
to
11F
18
120
to
12F
19
130
to
13F
20
140
to
14F
(21) (22)
160
to
16F
(23)
170
to
17F
Extension base unit (A1S55B-S1)
1
2
3 1
2
3
UNIT
1st extension
stage
1
2
3 1
2
3
UNIT
2nd extension
stage
1
2
3 1
2
3
UNIT
3rd extension
stage
Maximum number of
extension stages
Three
Maximum number of
input/output points
A1SHCPU : 256 points, A2SHCPU : 512 points, A2SHCPU-S1 : 1024 points
Main base units A1S32B, A1S33B, A1S35B, A1S38B
Extension base units
A1S52B(S1), A1S55B(S1), A1S58B(S1), A1S65B(S1), A1S68B(S1), A52B, A55B, A58B, A62B,
A65B, A68B
Extension cables
A1SC01B (for installation on the right side), A1SC03B, A1SC07B, A1SC12B, A1SC30B, A1SC60B,
AC06B, AC12B, AC30B, A1SC05NB, A1SC07NB, A1SC30NB, A1SC50NB
Notes
(1) Only the 1st extension base unit can be used when extension base units of types
other than the AnS S1 are equipped. (The S1 type and other types must not be
used together.)
(2) To use the AnS S1 type extension base unit with an A[ ]N or A[ ]A type, the latter
must be equipped with the last extension base unit. (The A[ ]N or A[ ]A extension
base unit cannot be connected to the AnS S1 type.)
(3) When an A1S52B (S1), A1S55B (S1), A1S58B (S1), A52B, A55B, or A58B is used,
a voltage of 5 V DC is supplied from the power supply module. See Section 7.1.3,
and consider the application.
(4) The extension cable should be used for distances of up to 6 m (19.68 ft.).
(5) The extension cable must not be bundled with or laid near the main circuit (high
voltage, high current) lines.
I/O number allocation
(1) Allocate I/O numbers to the extension base units in order of extension base unit
number, not in extension cable connection order.
(2) I/O numbers are allocated on the assumption that both the main base unit and the extension
base units have eight slots. Sixteen input/output points will be allocated to each slot
indicated by dotted lines in the above system configuration figure.
(3) Allocate 16 input/output points to empty slots.
(4) If the setting of an extension base unit has been omitted, make the allocation on
the assumption that each of the eight slots of the relevant base unit occupies 16
input/output points.
(5) Items (2) to (4) can be changed by performing "I/O allocation". For details, see the
ACPU Programming Manual (Fundamentals).