Instruction Manual

5. Commissioning

5−83

Festo P.BE−GDCP−SFC−LACI−PB−EN en 0812NH

5.7.10 Using the local digital outputs

Purpose The outputs can be used for the following:

 Displaying an internal logical status of the SFC−LACI,

(e.g.occurrence of an error)

 Displaying that certain values have been reached

(e.g.position values)

 Controlling a brake/clamping unit (see section 5.7.11)

 Operating a fan, DC motor or similar

Switching logic Positive switching logic: when the output is set (switching

state true,

logic 1"), the output is set to 24V. If the output is

not set, to 0V (or in Out2 with PWM, to high impedance).

Negative switching logic: If the output is set, the output is set

to 0V (or in Out2 with PWM, to high impedance). If the output

is not set:

to 24V.

PWM (only Out2) With pulse−width modulation (PWM), a pulsed signal is

output. When using as a brake output, a continuous signal is

initially output for 100 ms when the output is set

(CI6510/1Ah).

PWM value The PWM value is the duty cycle during a period of time

(frequency: approx. 20 kHz), in the following

diagram, 33 %:

24V

33%

100%

100ms

1 Only when using as a brake output

2 High impedance

Fig.5/12: PWM value