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Chapter 7 IO Module
7.1 LK610 16-channel Leaking Type Digital
Input Module
7.1.1 Basic Features
16-contact leaking type input
Field supply voltage: 10 VDC~31.2 VDC
Field power loss detection
Reverse supply protection
Isolation between each field channel and the system
Support the PROFIBUS-DP slave station protocol
Hot swapping
7.1.2 Operating Principle
Threshold level of LK610:
Logic 1: voltage range: 10~31.2 VDC, current: 2 mA (10 VDC)~10 mA (31.2 VDC).
Logic 0: Max. Voltage: 5 VDC, Max. Current: 1.5 mA.
As shown in Figure 7-1, LK610 adopts the leaking type input, with the negative pole of the field power
supply connected to the 16-channel common terminal. The one end of the switch is connected to the
positive pole of the field power supply, with the other end connected to the input terminal of the DI
channel. When the switch is turned off, the current flows into the optocoupler from the input terminal,
and then flows out of the common terminal and back to the negative pole of the field power supply.
When the input voltage is 10~31.2 VDC, the LED side of the optocoupler is turned on, providing a high
level output. When the input voltage is no more than 5VDC or the input voltage is more than 1.5 mA
LED side of the optocoupler is cut off, providing a low level output.
The RC filter circuit filters the input voltage to remove dithering, with the LED playing a role in reserve
protection.
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