FPΣ User's Manual 
 
4.3 FPΣ Memory Expansion Unit 
49 
General specifications 
Item  Description 
Ambient temperature 
0°C–+55°C 
Ambient humidity 
30–85% RH (at 25°C non-condensing) 
Storage temperature 
-20°C–+70°C 
Storage humidity 
30–85% RH (at 25°C non-condensing) 
Vibration resistance 
10–55Hz, 1 cycle/min, double amplitude of 0.75mm, 10min on 3 axes 
Shock resistance 
≥98m/s
2
, 4 times on 3 axes 
Noise immunity 
1000Vp-p, with pulse widths 50ns and 1μs (based on in-house measurements) 
Operation conditions 
Free from corrosive gases and excessive dust 
Weight 
≈80g 
Performance specifications 
Item  Description 
Memory 
256 Kwords (1 Kword x 256 banks) 
Battery life 
≥5 years 
Current consumption (5V) 
≤100mA 
Number of occupied points 
16 input points 
 
4.3.1 Data Organization 
The data in the memory expansion unit is organized in 256 banks (1 bank = 1 Kword = 1024 
words). 
Banks are assigned hexadecimal numbers from 0 to FF and each bank has word addresses 
ranging from 0 to 3FF (decimal 0–1023). 
To read or write data in the memory expansion unit, the bank number and word address must 
be specified.