Application And Areas Of Use; General Information; Criteria For Selection; Figure 6-3: Application Example, Coupling Links In Box Terminal Format - Siemens sirius System Manual

3RH, 3TX, LZX coupling links

6.3 Application and areas of use

6.3.1 General information

Advantages
Applications
Usage
Application example

6.3.2 Criteria for selection

Technical specifications
6-10
The use of coupling links offers the following advantages:
• Galvanic isolation between two circuits
• Current gain
• Protects the controller from interference and overvoltage
• Substantially reduces the power input of switchgear
• Permits power gain or level adaptation
Coupling links are used in:
• Production engineering
• Machine setup
• Process control in power distribution
• Building services automation
• Process engineering
Coupling links are used for:
• Floating signal transmission
• Linking of different voltages (AC/DC) and currents
• Power gain
• Level adaptation
• Protection of the controller against EMC noise from the I/O
• Contact multiplication
I/O
Devices
110 VAC
24 VDC
230 VAC
Pushbutton Coupling
Position link
switch

Figure 6-3: Application example, coupling links in box terminal format

Coupling links are selected on the basis of a number of criteria:
See Section 6.7:
• Rated control supply voltage U
• Typical power input
• Output elements
• Rated operational currents I
• Permissible line length
Electronic
controller
24 VDC
In- Out-
put put
s
e
Final control-
ling element
110 VAC
230 VAC
Coup-
Motor
ling contactor
link
SIRIUS System Manual
GWA 4NEB 430 0999-02b
M