QKM QD1, User Manual, Page: 23 / 64

Chapter 2
Work Principle
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2.3 Digital input (DI)
2.3.1 Modular type
Modular QD1 supports 32- or 16-channel optocoupler-isolated digital input, and the
input circuit diagram is shown in Figure 2-6.
Figure 2-6 Input circuit diagram of modular QD1
2.3.2 Economical type
Economical QD1 supports 16-channel optocoupler-isolated digital input, and a
single slave station can achieve up to 112-channel optocoupler-isolated digital input via
cascaded daughterboards. The input circuit diagram is shown in Figure 2-7.
User port
Controller
Optocoupler-isolated DI