LKS is a safety control system developed by HollySys, and meets the requirements of system capability of safety integrity level SIL2 with large capacity, high availability, superior performance, fast response characteristics, can be widely used in rail transportation, petrochemical, fine chemical industry, oil and gas pipeline transmission, hospital safety equipment, rail vehicle maintenance station and enterprise ESD system. Control system is composed of the controller and the IO module to complete the functions of data acquisition, logic operation, action output, human-computer interaction and so on, so as to realize the security protection function.
Hardware Components and Structures
LKS safety control system adopts the dual backplane redundant structure, install a control unit on the two backplanes respectively as A series and B series. Each control unit consists of the following components:
Figure 1: LKS Control Unit Components
Safety 24V Power 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 backplane.
Safety Main Control Module
Safety main control module LK220S is redundant in configuration. Module contains two 10/100 Mbps Ethernet interfaces to connect engineer station and operator station, to download the user program and upgrade controller. And also as a MODBUSTCP master/slave station to communicate with other devices. You can upgrade controller and store user files via SD card slot in panel. The controller runs in the different mode by changing the position of key switch. In redundancy mode, two controllers are in master –slave relationship, and the master switches to slave when fault occurs in master controller.
Safety Redundant Communication Module
It is used to complete the redundant communication between A and B frame with fiber cable.
Safety DP Master Station Communication Module
LK249S module includes two DB9 communication interface, connected to the expansion backplane LK117 / LK118 by DP cable, establish the communication connection with IO module. LK249S module exchanges data with safety main control module via the bus in backplane.
4 Slot Local Backplane Module
It is used to install the LK220S, LK921S, LK240S and LK249S. It supports both high-speed local backplane bus and PROFIBUS-DP bus for data exchanging between modules.
Hardware products of LKS safety control system mainly include backplanes, power modules, main control module, communication modules, I/O modules and attachments, as shown below.
LKS is a SIL2 safety control system of HollySys, therefore, Safety FA-AutoThink as the configuration software self-developed for LKS system. It belongs to HollySys AutoThink software family. Safety FA-AutoThink has the following characteristics: