Functionality

General

The power feed module supplies the Power Rail with a voltage of 24 V DC and a maximum current of 4 A.

The dual designed power feed terminals 8+ and 11+ or 9- and 12- have the ability to loop the supply (up

to a max. of 10 A). The integrated fault evaluation detects shorts and possible collective error messages.

In a fault condition, the relays switch closed (terminals 7 and 10) and the fault is indicated by means of a

red LED on the front panel. The mode of operation can be adjusted with a plug-in jumper. The terminals

13 and 15 are for the bus connection (only with Power Rail PR 900-N). The terminal 14 is the measuring

point for the collective error message (only planned for inspection or test, may not be wired into the

system).

Features and Benefits

■ 24 V DC supply voltage

■ Supply current ≤ 4 A

■ Bus access via terminals

■ Redundant supply

■ Fault signal output with adjustable

mode of operation

■ EMC acc. to NAMUR NE 21