DL06 Micro PLC User Manual, 3rd Edition, Rev. E
Chapter 2: Installation, Wiring, and Specifications
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Most DL06 input and output circuits are grouped into banks that share a common return path.
The best indication of I/O common grouping is on the wiring label. The I/O common
The following complete set of labels shows five banks of
four inputs and four banks of four outputs. One common is provided for each bank.
This set of labels is for DC (sinking) output versions such as the D0-06DD1 and
D0-06DD1-D. One common is provided for each group of four outputs, and one designated
terminal on the output side accepts power for the output stage.
+
–
I/O
Circuit
Return Path
Main Path
(I/O point)
Field
Device
AC
(
N
)
24V
0V
N.C.
C1 C3Y0 Y15Y12Y10Y17Y7Y5Y2
C0 C2 Y16Y14Y13Y11Y6Y4Y3Y1
LG
G
AC
(
L
)
C0 C4C2X1 X3 X4 X6 X11X13 X14X16 X21X23 N.C.
C1 C3X2 X5 X7 X10X12 X15X17 X20X22X0
N.C.
AC
(
N
)
24V
0V
+V
C1 C3Y0 Y15Y12Y10Y17Y7Y5Y2
C0 C2 Y16Y14Y13Y11Y6Y4Y3Y1
LG
G
AC
(
L
)
I/O Common Terminal Concepts
In order for a PLC I/O circuit to operate, current
must enter at one terminal and exit at another.
This means at least two terminals are associated
with every I/O point. In the figure to the right,
the input or output terminal is the main path
for the current. One additional terminal must
provide the return path to the power supply.
Most input or output point groups on PLCs
share the return path among two or more I/O
points. The figure to the right shows a group (or
bank) of 4 input points which share a common
return path. In this way, the four inputs require
only five terminals instead of eight.
NOTE: In the circuit to the right, the current in the
common path is 4 times any channel’s input current
when all inputs are energized. This is especially
important in output circuits, where heavier gauge
wire is sometimes necessary on commons.
groups are separated by a bold line. A thinner line
separates the inputs associated with that common. To
the right, notice that X0, X1, X2, and X3 share the
common terminal C0, located to the left of X1.
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