Removable Terminal Block (RTB): A field wiring connector for I/O modules. Field wiring is connected to an RTB rather than directly to a module terminal block.
Interface Module (IFM): A field wiring arm that uses prewired/factory-wired cable to connect to an I/O module.
ControlBus Connector: The backplane connector interface for the ControlLogix system that connects the module to the ControlBus backplane.
Connector Pins: Pins that create input/output, power and grounding connections to the module through an RTB or IFM.
PLC CONTROL Module Components
Locking Tab: Anchors the RTB or IFM cable on the module, maintaining wiring connections.
Slots for Keying: Mechanically keys the RTB to prevent inadvertently making the wrong wire connections to the module.
Status Indicators: Display the status of communications, module health, and input/output devices. Use these indicators to help troubleshooting errors or system faults.
Top and Bottom Guides: Provide assistance in seating the RTB or IFM cable into the module.
RIUP: ControlLogix feature that allows 1756 modules to be removed and inserted into a chassis while backplane power applied
