Programmable Logic Controller (PLC)

LK Large Series PLC

HollySys launched its updated version large scale Programmable Logic Controller (PLC), this version does have some differences in appearance and enhancements. It adopt the dual rack redundant structure which can be mounted separately on two racks, respectively, A series and B series.

The updated version PLC can be widely used in a variety of applications such as the high-end machinery and equipment control, complex machine control, discrete manufacturing plant control, suitable for transportation, municipal services, water treatment and other public engineering.

LK220 Series PLC has successfully passed Wurldtech Achilles International Certification and HollySys was the first to obtain Achilles Level I Certification of large PLC suppliers in China and it proves that HollySys’s LK Control System Information Security capabilities have reached the international advanced standards, help to enhance the benefits of products in the smart plant, intelligent equipment, and intelligent city applications.

Download more info here:

  1. LK 220 Series Programmable Logic Controller System Manual 2018 V1.2
  2. Datasheet-LK PLC V2016
  3. HollySys LK 220 PLC Overview 2016

Feature Highlight

High Reliability
  • Dual rack redundant structure, including power redundancy, controller redundancy, network redundancy.
  • In redundancy mode, the system can run when there is a fault.
Fast Response
  • The fastest time for redundancy switching is 130 ms.
  • The minimum time of task scheduling is less than100 us.
  • The fastest loop response time of system is less than 200 ms.
Large Capacity
  • Under the same network segment, you can add 122 pairs control stations.
  • Single-DP network, you can add 116 IO slaves.
  • The IO capacity supported by system more than 10,000 points.
Easy Maintenance
  • Reading Log tool that can record the abnormal operation, fault and other information log more than 10,000.
  • You can respectively obtain module information and diagnostic information of each module through Module
  • Information Instruction library, System State Instruction library.
  • Each module is hot-swappable.
  • To update the system via SD card or AutoThink software.
  • Compatible with existing LK IO module.
Hardware Components & Structures


HollySys’ LK large PLC helps customer to increase their efficiency and productivity while minimizing life-cycle cost through its high reliability products and customize solutions.

For further information for LK large PLC, please contact +86-10-5898 1527.

High Performance
  • 533MHZ CPU, 13 nanoseconds processing speed.
  • Large Memory Capacity: Program: 16MB, Data: 64MB, 1MB power-loss protection zone.
Large Expandable I/O Control
  • Scalable and Flexible system expansion.
  • Up to max. of 57,334 digital I/O control points.
  • Up to max. of 3,584 analog I/O control points.
Redundany System
  • Redundancy support for CPU, Ethernet, PROFIBUS-DP, and Power Supply.
Backplane Architecture
  • Local Backplane: Comms+CPU+I/O or Highspeed I/O.
  • Expansion Backplane: Comms+I/O.
Communication Protocol
  • Support TCP/IP, PROFIBUS-DP, MODBUS, RS-232, RS-485.
Easy to Install, Operate, and Maintain
  • Hot Swappable Modules.
  • Self-diagnostic and fault-diagnostic.
  • Spring-cage wiring terminal.
  • Safety Module Insertion Key preventing incorrect module inserting on the backplane.
  • Backplane mounting with screws.
Low Power Consumption
  • CPU module draws 5 watts.
  • I/O module draws 2 watts.
Compact Structural Design
  • Integrated design saving installation space.
Standard Programming Languages
  • Programming software, PowerPRO, supports IEC-61131-3 standard with six programming language (LD, IL, FDB, ST, SFC, CFC).
Graphical HMI Designer
  • Graphical Libraries.
  • Alarm, Reports, Log, and Historical Trend.
  • User Friendly.
Typical Single CPU Architecture