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

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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.
Data cycle
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

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