User`s manual
IPL T SF Series • Communication and Control
Communication and Control, cont’d
4-4
Figure 4-4 — High and low transitions of
adjustable threshold with deadband (hysteresis)
Digital output
When a ex I/O port is congured as a digital output, it is set
to offer two output states: “on” and “off”. When the port is
set to an “on” state, (SW1 is closed), the I/O pin is connected
to ground (each I/O port is capable of sinking 250 mA max.).
When the port is set to the “off” state, (SW1 is open), the output
pin is oating.
If the application calls for TTL compatibility, SW2 can be
selected to provide a 2K pull-up resistor to +5 VDC.
Figure 4-5 — Sample of a digital output port
driving an LED using an external +5 VDC source
2
4
6
8
10
12
14
16
18
20
22
24
26
Low
High
Time
VDC
Upper
Hysteresis
Threshold
Lower
Threshold
I/O
24K SW1
390
+30V
+5V
GND