16 CHANNEL DIGITAL INPUT MODULE
masibus
Ref No: m11A/om/101
Issue No: 03
User’s Manual
Page 6 of 7
3.2 Wiring Diagram & Circuit Diagram:
1
2
4
3
X
Ex+
Ex-
1
2
4
3
X
Ex+
Where X = Filtering Circuit (AC Input)
Attenuation circuit (DC Input)
SW1
Ex-
Ex+
INPUT SIGNAL
DI 1
+
-
SW2
+
DI 2
-
SW3
+
DI 3
-
SW4
DI 16
-
+
Figure.3: Wiring Diagram & Circuit Diagram:
4. I/O MODULE OPERATION:
An input module respond to an
input signal in following manner:
Input filtering limits the effect of
voltage
transients
caused
by
contact bounce and/or electrical
noise. If not filtered, voltage
transients could produce false data.
All input modules use input
filtering.
Optical isolation shields back plane
circuits and module logic circuits
from possible damage due to
electrical transients.
Logic circuit processes the signal &
determines the output signal.
An output LED indicates the status
of the output signal.
Block Diagram of I/O Module is
shown in figure 4
X
OPTICAL
ISOLATION
LOGIC
CIRCUIT
OUTPUT
DRIVE
LED
OUTPUT
INPUT
Where X = Filtering Circuit (AC Input)
Attenuation circuit (DC Input)
Figure.4: Block Diagram of I/O Module
