1756 ControlLogix safety I/O modules require either a specific Removable Terminal Block (RTB) or 1492 interface module (IFM) to connect all
field-side wiring.
• 1756-IB16S and 1756-IB16SK (1756 ControlLogix 16-point Sinking Safety Input Modules) have been agency certified using only the
ControlLogix RTBs (1756-TBCHS or 1756-TBS6HS).
• 1756-OBV8S and 1756-OBV8SK (ControlLogix 8-point Safety Bipolar/Sourcing Output Modules) have been agency certified using only
the ControlLogix RTBs (1756-TBNHS and 1756-TBSHS).
• For information about the IFM module wiring systems that have been tested for use with 1756 Safety I/O modules, see Knowledgebase
Technote, 1492 IFM Modules, Cables and Wiring Diagrams for 1756-IB16S, 1756-OBV8S Safety I/O Modules.
