Normal Operation/Valve Control - Siemens DQ 4x24VDC/2A HS User Manual

Parameters/address space

4.3 Normal operation/Valve control

4.3 Normal operation/Valve control
Normal operation
"Normal operation" refers to the function of the DQ 4×24VDC/2A HS as digital output
module.
Valve control is a special function of normal operation.
Valve control function
You use valve control to switch to a smaller "holding current" after tightening the valve
(locked-rotor current). You do this by activating a pulse width modulation (see section Pulse
width modulation (Page 19)).
With a 0 → 1 transition of the digital channel, the configured holding time is started. After it
has expired, the pulse/pause duty factor is activated as pulse width modulation. The
actuating signal is output digitally as a pulse sequence of on and off pulses.
Configuration
You configure valve control with the following parameters:
● "Normal operation" operating mode
● Holding time valve control
● Pulse width modulation duty factor
● Pulse width modulation time period
Chronological sequence
The figure below shows the chronological sequence for valve control. The pulse width
modulation is activated in the next possible data cycle.
①
Data cycle
②
Holding time valve control
Figure 4-1 Valve control
18
Digital output module DQ 4x24VDC/2A HS (6ES7132-6BD20-0DA0)
Manual, 03/2015, A5E34944434-AA