plc program
PLC in practical applications often run into two problems: one is the PLC I/O points is not enough and needs to be expanded, however increased I/O points will increase costs; second, the PLC has selected an Extensible I/O points are limited and cannot be increased. Therefore, on the premise of meet the system requirements, the … Continue reading How to reduce PLC outputs
Now more commonly used RS232 serial 9-pin d-shaped serial [DB9] and 25-pin d-shaped serial [DB25], the maximum communication distance of up to [15m]. The short distance between two devices close, 232 of them with 232 cable directly connected to the serial port if distant, via modem (MODEM) connected.RS232 interface-"Negative logic"--the output is represented by +5V~+15V … Continue reading RS232 serial interface basics
CNC machine tools PLC consists of two types of interface information, namely electrical interfaces of the hardware information and register the software interface information.1. the signal flow including input and output interfaces2.From the signal amplitude characteristics including analog and switch interfacesInput signal: composed of machine transfer signals to the PLC or CNC external device known … Continue reading CNC machine tools PLC hardware electrical interface
PROFIBUS is the abbreviation of Process Field Bus, 1989 by Siemens-led 13 companies and 5 research institutions in the standardization norms established in a joint development project. 1996 PROFIBUS as Germany national standard DIN19245, is also a European standard EN50170. PROFIBUS achievement in practical applications, in many bus top, widely used in a variety of … Continue reading PROFIBUS fieldbus
CAN be controller area network (Controller Area NetWork) for short. It is Germany developed by Bosch company and several other semiconductor manufacturers, was initially designed specifically for the automotive industry, the workload of aimed to save on wiring, because of its features were later widely used in all walks of life. Its chip production by … Continue reading CAN be the abbreviation for controller area network
Integration of fieldbus control and information processing CC-Link (Control and Communication Link) is a province of wiring and information networks, it is not only highly real-time, distributed control, with smart device communications, RAS features, and rely on strong links with many equipment manufacturers, provide an open environment. Q Series PLC modules CC-Link QJ61BTll, in the … Continue reading Structure and application of CC-link fieldbus
1, PROFIBUS Protocol has three main parts:PROFIBUS DP (Distributed I/Os): between the master and the slave uses round-robin method of communication, mainly used in manufacturing unit-level and field-level communication in automation systems.PROFIBUS PA (Process Automation): power transmission and communications data across the bus, mainly used in process automation system oriented unit-level and field-level communications.PROFIBUS FMS … Continue reading PROFIBUS Protocol and network
PROFIBUS DP system configuration can be classified as DP master station system, CP Communications template main station system and intelligent slave DP systems. Three take DP master station system in the DP, CP Communications template main station system is basically the same hardware configuration.1. the PROFIBUS DP systems: master/slave with DP systemsTake DP master/slave system … Continue reading S7-300 PROFIBUS DP system configuration
Communications processors are used for SIMATIC CP 343-1 S7-300 communications processor. Shared CPU communications tasks and allows other connections.S7-300 by CP 343-1 and programmer, computer, human interface device, other SIMATICS7 system and the SIMATIC S5 programmable controller to communicate:CP 343-1 communication processors installing in S7-300 DIN standard rail, can also be installed on the extension … Continue reading S7-300 industrial Ethernet
1. S7 series: traditional PLC product, S7-200 is for the low performance requirementsSmall PLC. S7-300 is a modular-type small and medium PLC, up to 32 modules can be extended.S7-400 is a large PLC can be expanded more than 300 modules. S7-300/400 formMPI, PROFIBUS or industrial Ethernet, etc.2. M7-300/400: the S7-300/400 the same structure, it can … Continue reading Siemens PLC basic classification
PLC ONE 