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By Robert Cachro, Sr. R&D Engineer and Brad Stecker, Engineering Manager
Introduction
In this example the fault output from an HS35iQ encoder was connected to a Rockwell PLC. A simple single line
of ladder logic was used to read the fault line from the encoder and turn on an LED when a fault is present. The
LED is just an easy way to indicate the fault was successfully read from the encoder but other solutions such as
alerting maintenance are possible by utilizing the fault output function.
Hardware Setup
The following components were used to test this example:
•
HS35iQPROGR81721R2 encoder with 2.2k load resistors
•
L27ERM-QBFC1B PLC
•
24V DC Power supply
•
LED with current limiting resistor
The supply terminals for the PLC and the encoder were both connected to the same 24V DC power supply. The
24V power supply was also connected to the
+V
and
COM0
connections on the “DC OUT” port included with the
PLC. The anode or positive side of the LED had a resistor connected in series to limit the current supplied from
the PLC output. The LED/resistor pair was connected to
DC OUT 08
and
COM
. The fault output from the encoder
was connected to
DC IN 00
.
COM0
of “DC IN” was also tied to common (
COM
) of the PLC and encoder. See
the wiring diagram in Figure 1.
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