FPΣ User's Manual 
 
2.3 Restrictions on Unit Combinations 
11 
2.3  Restrictions on Unit Combinations 
By adding expansion units, the number of I/O points can be increased. However, the 
maximum number of expansion units per CPU is limited. 
 
2.3.1  FP0 Expansion Units 
A maximum of three FP0 I/O expansion units or FP0 intelligent units (or a combination of the 
two) can be connected on the right side of the FPΣ CPU. A combination of relay output types 
and transistor output types is also possible. 
AB
 
A
 
FPΣ CPU 
B
 
Maximum expansion: 3 units 
1
 
Expansion unit/intelligent unit 1 
2
 
Expansion unit/intelligent unit 2 
3
 
Expansion unit/intelligent unit 3 
Maximum number of I/O points 
CPU type  CPU  Using FP0 I/O expansion units 
FPG-C32x  32 128 
FPG-C28x  28 124 
FPG-C24x  24 120
*)
 
 
*)
  Number of points when using an FP0 transistor-type expansion unit. 
 
NOTE
 
•  Install the FP0 thermocouple unit to the right of other expansion units. If it 
is installed on the left side, overall precision will deteriorate. For details, 
refer to the FP0 thermocouple unit manual. 
•  Install the FP0 RTD unit to the right of the other expansion units.