Rockwell Automation 61C351 2-In/2-Out 4-20 mA Analog Rail Module - Manual (Page 39)

5Ć5
Step 4. Turn on power to the module and to the external
hardware. Use the Executive software to read the value
on the input channel. Use an ammeter to read the input
signals at the terminal point and compare the two. If both
read zero, verify that the external hardware is operating
correctly. If the external hardware is operating correctly,
the 32mA fuse for the input channel may be blown.
Step 5. Replace the 32mA fuse(s) that has blown following the
directions below.
a) Stop any application tasks that are running.
b) Turn off power to the external hardware connected to
the module. Turn off power (120 VAC or 24 VDC) to
the module.
c) Without disconnecting the wiring, remove the 12Ćpoint
connector from the faceplate and set aside. Without
disconnecting the wiring, remove the 4Ćpoint
connector from the faceplate and set aside.
d) Before disassembling the module, note that it consists
of two major pieces, the metal enclosure and the
printed circuit board, which is screwed to the left side
of the enclosure (if facing the front of the module).
After the screws are removed, the two pieces can be
seperated in a manner similar to that of opening a
book. Simply pull the left side of the module
(including the faceplate) to the left away from the
remainder of the metal enclosure. See below for the
screws that need to be removed. If some of the
screws are inaccessible, remove the entire module
from the cabinet before proceeding.