Setting The Pull-Up Voltage - IMS MicroLYNX Quick Manual

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U s e s o f t h e I s o l a t e d D i g i t a l I / O
The isolated I/O may be utilized to receive input from external devices such as
sensors, switches or PLC outputs. When configured as outputs, devices such as
relays, solenoids, LED's and PLC inputs may be controlled from the
M icroLYN X
S ystem
MicroLYNX. Depending on the device connected, the input or output may be
pulled-up to either the internal +5VDC supply or an external +5 to +24VDC
supply, or the I/O lines may be pulled-down to ground.
These features, combined with the programmability and robust construction of
the MicroLYNX I/O open an endless vista of possible uses for the I/O in your
application.
Setting Pull-up Voltage for the Isolated Digital I/O
The isolated I/O lines may be pulled-up two ways. Depending on your I/O setup
and devices used, it will be necessary for you to set the switches or supply an
external pull-up voltage
1]
2]
I n t e r n a l + 5 V D C
When using the internal +5VDC supply, the I/O line is pulled-up
through a 7.5kΩ resistor. To pull the I/O line up to the internal
supply, the switches for the I/O lines being pulled-up must be
placed in the ON position. This is not to be used as a +5VDC
output, only as a pull-up voltage if the user doesn't wish to supply
an external voltage.
E x t e r n a l + 5 t o + 2 4 V D C S u p p l y
If a higher voltage is needed, an external supply may be connected. The pull-up
switches will be ON, and the V+ output of the supply connected to pin 1 (V
PULLUP) and the supply return (GND) would be connected to pin 8, (I/O
GROUND) of the MicroLYNX I/O connector.
INPUTS
OUTPUTS
Figure 8.2: Isolated I/O Applications
The internal +5VDC, 150mA supply.
An external +5 to +24VDC supply.
S e nso rs
Sw itches
P L C O u tp uts
R ela ys
So len oids
LE D s
PL C In puts
25