Establishing Grounding Connections with the I/O Base

Electrical ground connections for the processors are created with the I/O base on which the processor is mounted. Electrical ground connections are established during the assembly process, as follows:

  • When you snap together the I/O base and the processor, an electrical ground connection is established by touching the ground contact spring on the I/O base to the ground contact plate on the processor.

1 ground contact spring on I/O base

2 ground contact plate on the processor

  • For an I/O base unit with a fixed ground nut, an electrical ground connection is established when you perform the following tasks:

    • Insert the male-female standoff into the fixed ground nut on the I/O base.

    • Connect a ground screw to the standoff through the top of the processor.

    Refer to the assembly topic for instructions on how to install the male-female standoff and ground screw.

    NOTE: A ground screw and male-female standoff can be used only with I/O base modules that include the fixed ground nut.
NOTE: To complete your grounding connections, establish both a protective ground (PE) and a functional ground (FE) for the I/O base. For a detailed description of grounding considerations for Momentum I/O base units, refer to the Modicon Momentum I/O Base User Guide.