Beckhoff EP8309-1022, Документация

Страница: 15 / 116

Product Overview
EP8309-1022 15 Version: 2.0.0
DO Outputs
The data for the digital outputs can be found under DO Outputs .
X5 pin4 -> socket 5, pin 4
....
PWM control (activated through PDO assignment 0x1602, default PWM, alternatively AO)
The control data for the PWM output can be found under PWM Control .
Enable Dithering -> activate dithering
Enable -> activate PWM output
Reset -> reset on error
PWM output -> load-independent current, depending on module rating
(e.g. 1.2 A and setting in object 0x8060:10)
AO outputs (activated through PDO assignment 0x1603), not activated by default
The values for the analog output can be found under AO Outputs .
Analog Output - output value
2.5 Pulse width modulation (PWM)
The Beckhoff terminals and box modules integrate compact PWM output stages in the smallest of designs.
PWM output stages control the output current through pulse width modulation (PWM) of the supply voltage.
This means that the full supply voltage is activated or deactivated at the output. The duty cycle (pulse width)
is modified, but not the voltage level. The current is built up based on the load connected to the inductance.
Fig. 5: Operation at load with adequate inductance
Fig. 6: Operation at load with inadequate inductance (near ohmic)