UI current loop jumpers - 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

Brand
Facility Explorer
Product name
FX-PCX27 Expansion Input/Output Module
Document type
Installation Guide
Document number
Part No. 24-10144-173
Document revision
G
Revision date
2019-03-22
Language
English

The UI current loop fail-safe jumpers are on the circuit board under the expansion module cover near the UI terminals. When a UI is defined (in the system software) as a 4 to 20 mA Analog Input and the UI’s current loop jumper is in the Disabled (default) position (Figure 1), the 4 to 20 mA current loop circuit opens whenever power to the expansion module is interrupted or off.

Figure 1. Current loop jumper positions

Setting the current loop jumper to the Enabled position (Figure 1) connects an internal 100 ohm resistor across the UI terminals, which maintains the 4 to 20 mA current loop circuit even when power to the expansion module is interrupted or off.

Important: Current Loop jumpers must be in the Disabled (default) position for all UIs that are not set up to operate as 4 to 20 mA analog inputs.