Specifications

Interfacing to Encoder Outputs
The DL06’s DC inputs are flexible in that they detect current flow in either direction, so they
can be wired to an encoder with either sourcing or sinking outputs. In the following circuit,
an encoder has open-collector NPN transistor outputs. It sinks current from the PLC input
point, which sources current. The power supply can be the +24VDC auxiliary supply or
another supply (+12VDC or +24VDC), as long as the input specifications are met.
In the next circuit, an encoder has open-emitter PNP transistor outputs. It sources current to
the PLC input point, which sinks the current back to ground. Since the encoder sources
current, no additional power supply is required. However, note that the encoder output must
be 12 to 24 volts (5V encoder outputs will not work).
DL06 Micro PLC User Manual, 3rd Edition, Rev. C
E–26
Appendix E: High-speed Input and Pulse Output Features
1
2
3
4
E
6
7
8
9
10
11
12
13
14
A
B
C
D
Encoder Output,
(one phase)
+–
Phase A or B Input
Output
Ground Common
12-24 VDC Supply
(sinking)
(sourcing)
Input
Phase A or B Input
Output (sourcing)
Ground
Input
+12 to 24VDC
(sinking)
Encoder Output,
(one phase)
Common