PM861AK01 3BSE018157R1 For small systems, such as 80 points or less. Generally do not need to expand, when the system is larger, it is necessary to expand. Products of different companies, the total number of points of the system and the number of expansion modules are limited, when the expansion still can not meet the requirements, the network structure can be used. Individual commands of some manufacturers’ products do not support expansion modules, therefore, it is necessary to pay attention to the software compilation when adopting analogue modules such as temperature, etc. Each manufacturer also has some regulations, please see the relevant technical manual. There are many types of expansion modules from various companies, such as single input module, single output module input output module, temperature module, high-speed input module, etc..

PM861AK01 3BSE018157R1 When you carry out network design, it is much more difficult than PLC stand-alone control Firstly, you should choose a model that you are more familiar with, and you should have a deeper understanding of its basic and functional instructions, and you should have a careful understanding of the execution speed of the instructions and the storage capacity of the user programme. Otherwise, it cannot adapt to your real-time requirements and cause system crash. In addition, the communication interface, communication protocol data transfer speed should also be considered. Finally, but also to the PLC business to seek network design and software technical support and detailed technical information, as for the choice of several layers of workstations, depending on the size of your system.

PM861AK01 3BSE018157R1 Before programming the software, you should first familiarise yourself with the software manual of the selected PLC product, and then program it after becoming proficient. If the graphical programmer or software package programming, it can be directly programmed, if programmed with a handheld programmer, you should first draw a ladder diagram, and then programming, so that less error, speed is also fast after the end of the programming first air-conditioning programme, to be normal after each action, and then debugging on the equipment.