NAiS FP Series User Manual page 21

Functions and Restrictions of the Unit
1.3.2 Restrictions on the Number of Units for Expansion (for FPΣ
expansion unit)
Expansion unit 4
Max. possible expansion is with a total of four units.
Up to four dedicated FPΣ expansion units can be added at the left of the FPΣ.
The 64 points type expansion unit consist of 32 input points and 32 transistor output
points.
Controllable I/O Points
Type of control unit
FPG - C32T2
FPG - C24R2
The FPΣ expansion unit cannot be used for FPG - C32T.
Tip
If using FP0 expansion units and FPΣ expansion units in combination, the number
of input and output points can be expanded to a maximum of 384 points for the
FPG - C32T2 and 376 points for the FPG - C24R2.
1 - 8
Expansion unit 3 Expansion unit 2
Number of I/O points when using
control unit
32 points
24 points
Expansion unit 1 Control unit
Number of I/O points when using
FPΣ expansion unit
Max. 288 points
Max. 280 points
FPΣ