Chapter 2 Overview
6 Beijing HollySys Intelligent Technologies Co., Ltd. All Rights Reserved
2.2 Hardware components and structures
LK series large-scale PLC system adopt the dual backplane redundant structure, a large universal
controller is mounted separately on two backplanes, respectively, A series and B series. Each
redundant controller set consists of the following components:
Figure 2-1 LK Controller Components
1： LK921 24V power switching module
2： LK220 master control module
3： LK240 redundancy communication module
4： LK249 DP master station communication module
5： LK130 4-slot backboard module
1. 24V power switching module
Dual 24V DC inputs are converted to single 24V DC output by redundant processing, it provides
redundant 24VDC power supply for the 4 slot backboard.
2. Master control module
Master control module LK220 is redundant in configuration. Module contains two 10/100 Mbps
Ethernet interface for connection to a program computer, to download the user program and upgrade
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