Setting the End-of-Line (EOL) switch - Facility Explorer - Part No. 24-10144-173 - FX-PCX2721-0 - Field Device - FX-PCX27 Expansion Input/Output Module

FX-PCX2721 Expansion Input/Output Module Installation Instructions

Facility Explorer
Product name
FX-PCX27 Expansion Input/Output Module
Document type
Installation Guide
Document number
Part No. 24-10144-173
Document revision
Revision date

About this task

Each expansion module has an EOL switch. When the EOL switch is set to ON, it sets the expansion module as a terminating device on the bus. See Figure 1 for the EOL switch location. The default EOL switch position is OFF.

Figure 1. End-of-Line switch positions

To set the EOL switch on an expansion module, complete the following steps:


  1. Determine the physical location of the expansion module on the SA or FC bus.
  2. Determine if the expansion module must be set as a terminating device on the bus.
    Note: The EOL termination rules for SA buses and FC buses are different. Refer to the following documents depending on your system (FX or BCPro): FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670) or MS/TP Communications Bus for BCPro System Technical Bulletin (LIT-12011908) for detailed information regarding EOL termination rules and EOL switch settings on SA and FC buses.
  3. If the expansion module is a terminating device on the FC bus, set the EOL switch to ON. If the expansion module is not a terminating device on the bus, set the EOL switch to OFF.

    When an expansion module is connected to power with its EOL switch set to ON, the amber EOL LED on the expansion module cover is lit.