Digital Input Module Block Diagram - ABB Symphony Harmony Series Instruction

Inputs
DC inputs to allow for contact debounce time (17 millisecond
response time).
The IMDSI13 (24 VDC), the IMDSI14 (48 VDC), modules have
fixed configurations and do not require any jumper selections.
The IMDSI22 (120 VAC, 24VDC, 48VDC, or 125 VDC) module
has jumpers to select the working voltage. Refer to
for an explanation of the jumper connections.
Input Circuits
Figure
the module. The input isolation block consists of current limit-
ers and optocouplers to isolate the 16 field inputs from the
module circuitry. The input circuits provide 1500 VDC isola-
tion between input and logic circuitry and other input chan-
nels. For further information on specifications refer to
Table 1-4.
Digital input high impedance provides additional (passive) pro-
tection from high energy transients of field digital inputs.
S 1
G R O U P A
LE D S
M O D U LE
S TAT U S
G R O U P B
LE D S
Figure 2-1. Digital Input Module Block Diagram
2 - 2
NOTE: Due to the number of pins on the P3 connector, 12 inputs are separate
while the remaining two pairs share input terminals. The positive (+) side of
point seven and eight are tied together in each group (refer to Table 5-1).
These points must use the same contact voltage (120 VAC, 24 VDC, 48 VDC,
or 125 VDC) set by the jumpers on the IMDSI22 module, or according to the
relevant modules working voltage.
2-1 is a block diagram illustrating signal flow through
A D D R E S S
S W ITC H
1 2 3 4 5 6 7 8
O P E N
C O N T R O L
LO G IC
I/O E X PA N D E R
B U S IN T E R FA C E
TH R E S H O LD IN P U T
D E TE C T IO N IS O LAT IO N
Section 3
L O G IC
P 1
P OW E R
G R O U P A
F IE LD
P 3
IN P U T
G R O U P B
I/O
E X PA N D E R
B U S
P 2
T 03247A
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