Beijing HollySys Intelligent Technologies Co., Ltd. All Rights Reserved 5
Chapter 2 Overview
LK220 Master Control Module act as the master control unit for the medium and large PLC system in
hollysys company, which has high reliability, high performance, and fast response characteristics, can
be widely used in a variety of application scenarios, such as subway, water treatment, high-end
equipment, complex machines, and production line control. The redundant system is composed of the
controller, IO and configuration software, which can realize the functions of data acquisition, logic
calculation, output execution, human-computer interaction, data exchange and so on.
2.1 System characteristic
2.1.1 High Reliability
(1) Dual backplane redundant structure includes power redundancy, controller redundancy and
network redundancy.
(2) In redundancy mode, the system can run when there is a single fault.
(3) The system is based on the TCP/IP protocol to realize safety and reliable network
communication, and defense tens of thousands of zero day vulnerabilities and other
undisclosed vulnerabilities or risks. System has passed Wurldtech's Achilles international
certification.
(4) Support three proofing: moisture proofing, salt spray proofing and fungus proofing, satisfying
GB2423 • 3/ GB2423 • 17/ GB2423 • 16.
2.1.2 Fast Response
(1) The time for redundancy switching is no more than 130ms.
(2) The minimum time of task scheduling is less than100 us.
(3) The loop response time of system is less than 200ms.
2.1.3 Large Capacity
(1) Single-DP network, 124 IO slaves can be added.
(2) The IO capacity supported by the system is more than 10,000 points.
2.1.4 Easy Maintenance
(1) Reading Log tool can record abnormal operations, faults and other information, and more
than 10,000 logs.
(2) Module information and diagnostic information of each module can be obtained respectively
through Module Information Instruction Library and System State Instruction Library.
(3) Each module is hot-swappable.
(4) You can update the firmware via SD card or AutoThink software.
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