UMAX130511 Version 1.00A Preliminary Documentation
– May be subject to change
15 - 141
1.1.
Digital Function Block
The digital input (DI) function block only becomes applicable on the input when object 6112h,
AI
Operation
, is set to a digital input response.
Figure 3
– Digital Input Objects
When object 6112h is set to 10 =
Digital Input
, object 2020h
DI Pull-up/Pull-down Mode
will
determine the configuration of the internal Pull-up/Pull-down resistors. The options for object 2020h
are shown in Table 1, with the default bolded.
Value Meaning
0
Pullup/Down Disabled (high impedance input)
1
10
kΩ Pullup Resistor Enabled
2
10
kΩ Pulldown Resistor Enabled
Table 1
– DI Pullup/Down Options
Figure 4 shows the hysteresis on the input when switching a discrete signal. A digital input can be
switched up to +Vcc (42Vmax.)
Figure 4
– Discrete Input Hysteresis
Once the raw state has been evaluated, the logical state of the input is determined by object 6002h
DI_Polarity_8_Input_Lines
. The options for object 6002h are shown in Table 2. The state of the
DI will be written to read-only object 6000h
DI_Read_state_8_Input_Lines
. By default, normal
on/off logic is used.
Value
Meaning
Discrete Input Active High Hysteresis
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
In
p
u
V
o
lt
a
g
e
(
V
)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
D
ig
it
a
l
S
ig
n
a
l
Input Voltage
Digital Hi/Lo
Discrete Input Active Low Hysteresis
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
In
p
u
t
V
o
lt
a
g
e
(
V
)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
D
ig
it
a
l
S
ig
n
a
l
Input Voltage (V)
Digital Hi/Lo
