Node Structure

Note that product-specific configuration or test steps may be necessary. For example before:

• Commissioning
• Recommissioning
• Exchange and replacement of I/O modules

These configuration or test steps are described in the respective & Product Manual.

Types of Components

Several different types of components are used in the I/O system:

• Head Stations:
• PFC
• Controller
• Fieldbus couplers
• I/O Modules:
• Analog input and output modules
• Digital input and output modules
• Function and technology modules
• Communication modules
• Supply and segment modules

Node Configuration

A node configuration consists of at least the following:

• A head station
• A power supply
• An I/O module
• An end module

Structuring a Node

When planning a node, please take the following into account:

• Grouping by potential group
• Optical delimitation of the potential groups

For fast, effortless planning, use the WAGO Configurator Smart Designer.

Number of I/O Modules

The maximum number of I/O modules that can be operated in one node depends on several factors:

• Mechanical Expansion:
  The distance between a head station and an end module must not exceed 768 mm, including the end module. If your node is wider, it must be divided into multiple sections with an additional fieldbus coupler, controller or internal data bus extension.
• Addressability:
  Up to 250 I/O modules can be addressed, depending on the head station.
  When calculating this number, it is not necessary to include I/O modules that do not have any process or diagnostic data (e.g., distance modules).
• Head Station Memory:
  Head stations have limited memory for the process image.
• Fieldbus Technology Characteristics