Manual for installation of the Sensformer® Connectivity Device 
 
  © 2020 Siemens Energy  Page 10 
 
 
Figure 8- Example for connecting ModBus 
 
Size of conductor: 1.5 mm
2
. 
Tightening torque: < 1Nm. 
Cable: double insulated, UL 94 V-1 flammability classification and 
VW-1 flame rating. 
Ferrule:  certified, 1.5  mm
2
  conductor  area with 14  mm  overall 
length and 8 mm pin length. 
Connector pins: 
•  D+: data plus line 
•  D-: data minus line, 
•  COM:  internal  common  reference  point  of  Sensformer 
Connectivity Device. 
 
7.  Connect digital inputs 
The  digital  inputs  are  not  allowed  to  be  powered  when 
installing and/or wiring Sensformer Connectivity Device. 
Risk of electric shock! 
Do  not  use  cables  without  ferrules.  The  ferrules  must  be 
certified. 
For  more  information,  see  the  Installation 
requirements chapter. 
The using cables on the digital inputs must be double insulated 
and must have UL 94 V-1 flammability classification and VW-1 
flame rating. 
For  more  information,  see  the  Installation 
requirements chapter. 
 
Connect the digital sensors to the digital inputs of the Sensformer 
Connectivity  Device.  D1A  and  D1B,  D2A  and  D2B  are 
interchangeable connections. 
 
Though, the digital inputs  are interchangeable, the measured 
values are not in DC mode. Because of that, the recommended 
wiring is the following: the D2B and D1B are the negative, the 
D2A and D1A are the positive in DC mode. 
This has no effect to the AC mode. 
 
 
Figure 9 – Example for connecting digital inputs 
 
Size of conductor: 1.5 mm
2
. 
Tightening torque: < 1Nm. 
Cable: double insulated, UL 94 V-1 flammability classification and 
VW-1 flame rating. 
Ferrule: certified, 1.5 mm
2
 conductor area with 16-18 mm overall 
length and 8 mm pin length. 
 
8.  Connect the power supply 
PE  marked  connector  does  NOT  provide  PROTECTIVE 
BONDING  PROTECTION,  its  purpose  is  FUNCTIONAL  EARTH 
TERMINAL! 
Be sure to disconnect the power cord before installing and or 
wiring Sensformer Connectivity Device. 
Risk of electric shock! 
 
The power supply of Sensformer Connectivity Device has a three-
pole screw terminal (PE, L and N). In case AC power supply is the 
L and N terminal are polarity independent, and must be wired up 
the PE. 
 
The color of PE cable must be green-yellow. 
For  more  information,  see  the  Installation 
requirements chapter.