I/O Allocation 
 
FPΣ User's Manual 
58 
5.1 General 
I/O allocation is performed automatically when an expansion unit is added and is determined 
by the installation location. The I/O allocation of the FPΣ CPU is fixed.  
4 x FP∑
3 x FP0
1487 6 35
FP∑
2
 
I/O allocation of FP
Σ
 expansion units and FP0 expansion units 
Type of unit  Unit number  Slot number 
1)
  I/O addresses 
2)
 
3)
 
4)
 
FPΣ CPU 
1
 
– –  X0–XF, Y0–YF 
2
 
1 – X20–X3F, Y20–Y3F 
3
 
2 – X40–X5F, Y40–Y5F 
FP0 I/O expansion unit 
4
 
3 – X60–X7F, Y60–Y7F 
5
 
1 0 X100–X17F, Y100–Y17F 
6
 
2 1 X180–X25F, Y180–Y25F 
7
 
3 2 X260–X33F, Y260–Y33F 
FPΣ I/O expansion unit 
8
 
4 3 X340–X41F, Y340–Y41F 
 
 
NOTE
 
1.  Slot numbers must be indicated in certain programming instructions. 
2.  The input relay “X” and output relay “Y” are expressed as a combination of 
decimal (
1
) and hexadecimal (
2
) numbers: 
 
X
1, 2, 3 ... 9
1, 2, 3 ... 9, A, B ... F