TX-I/O Island Bus
Tightening Torque
When using electric screwdrivers for wiring terminals always set the torque to 0.5 to
0.6 Nm or 50 to 60 Ncm.
Test Terminals
Pin diameter of I/O module test terminals is 0.078” (2 mm).
Common Grounding Requirement
CAUTION
All devices not isolated by a Trunk Isolator/Extender (TIE) or isolation transformer
must be connected to the same grounding point.
CAUTION
Do not connect TX-I/O components to a floating system neutral. Otherwise,
equipment damage will occur.
• System Neutral ( ) must be continuous throughout the TX-I/O Bus.
• System Neutral must be connected to building approved earth-ground ( ) at a
single point only at the 24 Vac transformer.
Third-party Transformer
If powering from a third-party transformer, earth ground the secondary neutral to
the same point for all panels powered by that transformer.
If powering TX-I/O components from a third-party transformer, connect the
transformer neutral to the building-approved earth ground.
I/O Module Insertion Required for Proper Grounding
All measuring/neutral terminals are connected in the plug-in I/O module, not in the
terminal base. When the plug-in I/O module is removed, these terminals are not
connected.
41
Siemens Industry, Inc. TALON TX-I/O Modules and Island Bus Technical Reference
588-587 CONFIDENTIAL: For internal use only 4/6/2010
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