C
L E A R
P
A T H
M C / S D
U
S E R
M
A N U A L
R
E V
.
3 . 0 9
5 6
T
EKNIC
,
I
NC
. T
EL
.
(585)
784-7454
HLFB
O
UTPUT
W
IRING
E
XAMPLES
Any external circuit or device to be connected to the ClearPath HLFB
output should conform to the guidelines below. Proper circuit
design/selection greatly reduces the probability of electrically damaging
the output, particularly in the event of a common production mistake such
as an accidental short or reversed wiring.
HLFB
AS A
"S
INKING
"
O
UTPUT
The HLFB output can be used as a sinking output as shown below. This
topology provides ClearPath with a high level of immunity from damage if,
for example, the circuit is shorted to machine chassis. Such a short would
simply make the output appear like a closed circuit.
Note:
the preceding assumes the DC supply return is connected to chassis
ground at one location in the machine
.
ClearPath Internal
HLFB
+
HLFB -
Current
Limiter
5-24VDC
(Return)
PLC Input
5-24VDC
(Supply)
IN
+
IN
-
ClearPath Internal
HLFB
+
HLFB -
Current
Limiter
5-24VDC
(Supply)
Microcontroller
Digital Input
Pull-up resistor
(1k - 20k typical)
IN
GND (Return)
HLFB as a sinking output