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2. SYSTEM CONFIGURATION
2.4.2
Outline of A1SJHCPU(S8) configuration
System configuration
Maximum number of
extension stages
Maximum number of
input/output points
Extension base units
Extension cables
Notes
I/O number allocation
This section describes the system configuration, numbers of I/O points, I/O
allocations, etc., for a stand-alone A1SJHCPU(S8) system.
Extension cable
1st extension
base unit
UNIT
1
1
2
2
3
3
To 2nd and 3rd extension base units
(Can be used by allocating I/O points.)
*In this example, a 16-point module is installed at each slot.
Three
256
A1S52B(S1), A1S55B(S1), A1S58B(S1), A1S65B(S1), A1S68B(S1), A52B, A55B, A58B, A62B,
A65B, A68B
A1SC01B (for installation on the right side), A1SC03B, A1SC07B, A1SC12B, A1SC30B, A1SC60B,
AC06B, AC12B, AC30B, A1SC05NB, A1SC07NB, A1SC30NB, A1SC50NB
(1) If using a type of extension base unit for A1S use other than the S1 type,, only one
extension base unit can be installed. (Combined use of S1 type extension base units
and extension base units other than the S1 type is not possible.)
(2) When using one or more S1 type extension base units for A1S use in combination
with one or more extension base units for A[ ]N or A[ ]A use, the final extension base
unit must be one for A[ ]N or A[ ]A use. (An S1 type extension base for A1S use can
not be connected from an extension base for A[ ]N or A[ ]A use.)
(3) Extension base units A1S52B(S1), A1S55B(S1), A1S58B(S1), A52B, A55B, A58B
are supplied with a 5 V DC power supply from the power supply module on the main
base unit; see Section 7.1.3 to determine whether or not these extension base
units can be used.
(4) The total length of extension cable used must not exceed 6 m (19.68 ft.).
(1) I/O numbers are allocated in the order of the numbers set in extension base
number setting, regardless of the order of connection of extension cables.
(2) When allocating I/O points, all main bases and extension bases are regarded as
having 8 slots of I/O points. Accordingly, 16 points per slot are allocated to the part
of the system configuration drawing indicated using dotted lines.
(3) 16 points are allocated to vacant slots.
(4) If extension base number setting has not been performed at one or more modules,
I/O points are allocated by regarding each slot in the total number of slots involved-
obtained by multiplying the number of extension bases for which setting was skipped
by 8 slots-as occupying 16 points per slot.
(5) The allocations in (2) to (4) above can be changed by performing "I/O allocation".
When using two or three extension base units, perform "I/O allocation" to allocate 0
points to vacant slots of the A1SJCPU and some slots of the first extension base
unit, and allocate I/O points to the second and third extension base units. (The total
number of I/O points for the A1SJCPU and 1st, 2nd, and 3rd extension base units is
256.)
For details on "I/O allocation", see the ACPU Programming Manual(Fundamentals).
0
1
2
3
00
10
20
30
A1SJHCPU
to
to
to
to
0F
1F
2F
3F
Extension base unit (A1S58B-S1)
8
9
10
11
12
13
80
90
A0
B0
C0
D0
to
to
to
to
to
to
8F
9F
AF
BF
CF
DF
2 - 21
MELSEC-A
4
5
6
7
Slot number
A1SJH : 5
40
50
60
70
to
to
to
to
A1SJH-S8 : 8
4F
5F
6F
7F
14
15
E0
F0
to
to
EF
FF
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