User Manual

Function blocks
221
08/04 AWB2528-1423GB
Function of the PUT function block
Figure 100: Signal diagram of PUT function block
1: trigger coil
2: trigger coil contact feedback
3: send
Pulse width modulation
This function block is available from device version 04.
easy800 provides 2 pulse width modulation function blocks
PW01 and PW02. The function blocks are connected directly
to the outputs.
They are assigned as follows:
PW01 r Q1
PW02 r Q2
The pulse width modulation function block is primarily used
for outputting the manipulated variable of a PID controller.
The maximum frequency is 200 kHz. This corresponds to a
period duration of 5 ms. The maximum period duration is
65.5 s.
Wiring a pulse width modulation function block
A pulse width modulation function block is integrated in the
circuit diagram as a contact or coil.
1
2
3
h
When using the pulse width modulation function block
with a minimum on time of less than 1 s only use devices
with transistor outputs.