For processing input signals from binary sensors or mechanical contacts from the field, Pepperl+Fuchs offers highly reliable digital input modules for use in Zone 1 explosion-hazardous areas. As part of our FB system remote I/O solution, these modules feature Ex ia or Ex e terminals and are ideally suited for connecting NAMUR proximity switches, optocouplers, or volt-free contacts.
A mechanical contact or switch can also be used with an isolated barrier and mounted with parallel or serial resistors to simulate operation of a NAMUR initiator.
FB system remote I/O digital inputs are available in the following versions:
The modules support lead breakage detection and short circuit detection. Galvanic isolation separates the inputs from bus and power. In addition, the modules are hot-swappable which allows quick and easy module replacement without time-consuming system shutdowns.