CPU Types 
 
FPΣ User's Manual 
20 
3.2  Input and Output Specifications 
3.2.1 Input Specifications 
The input specifications below apply to all FPΣ CPU types. 
 
Item  Description 
Insulation method 
Optical coupler 
Rated input voltage 
24V DC 
Operating voltage range 
21.6–26.4V DC 
Rated input current 
For X0, X1, X3, X4: 
For X2, X5-X7: 
For X8-XF: 
≈8mA 
≈4.3mA 
≈3.5mA 
Input points per common 
C32, C28: 16 (X0–XF) 
C24: 8 (X0–X7 and X8–XF) 
(Either the positive or negative pole of the input power supply can be 
connected to the common terminal.) 
Min. ON voltage/min. ON current 
For X0, X1, X3, X4: 
For X2, X5–XF: 
19.2V DC/6mA 
19.2V DC/3mA 
Max. OFF voltage/max. OFF current 
2.4V DC/1.3mA 
For X0, X1, X3, X4: 
≈3kΩ 
For X2, X5–X7: 
≈5.6kΩ 
Input impedance 
For X8–XF: 
≈6.8kΩ 
FALSE → TRUE 
Response time 
TRUE → FALSE 
For input X0, X1, X3, X4: 
≤1ms: normal input 
≤5μs: high-speed counter input, pulse catch input, interrupt input (see 
note) 
For input X2, X5–X7: 
≤1ms: normal input 
≤100μs: high-speed counter input, pulse catch input, interrupt input (see 
note) 
For input X8–XF: 
≤1ms: normal input 
Operation mode indicator 
LEDs 
 
NOTE
 
This specification applies when the rated input voltage is 24V DC and the 
temperature is 25°C.