Digital Input Circuit; Digital Output Circuit - ABB Symphony Harmony Series Instruction

Digital I/O
through J6 on the I/O module select the input voltage and
input mode.
D I+
1
JU M P E R
D I–
P W R
D I R E F E R E N C E
R E F D I
Figure 2-4. Digital Input Circuit
Digital Outputs
The output isolation block consists of optocouplers to isolate
the control logic circuits from the process (Fig. 2-5). Four open
collector transistors that can sink a 250 milliampere load for
24 VDC or a 125 milliampere load for 48 VDC make up the
driver block.
Figure 2-5. Digital Output Circuit
2 - 6
1
JU M P E R
R E S IS TO R S
2
POWER
1
FROM
2
OUTPUT
CIRCUITRY
P W R
4
R E F D I
11
+
3 10
–
1
2
3
4
J2
4
3
P W R
TO IN P U T
C IR C U IT RY
13
T 00 32 4B
FIELD
OUTPUT
TP00085A
WBPEEUI240769B0