, multi-point interface (MPI)S7-300/S7-400 network PLC via MPI interface, MPI network using global data (Globe Data) communication patterns can be for small amounts of data exchange between PLC. It does not require additional hardware and software, low cost and usage reduction.MPI network is used to connect multiple CPU or device. MPI for RS-485, a multicast … Continue reading Multi-point interface (MPI) and global data sets
Category: plc program
PROFIBUS Protocol and network
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
S7-300 PROFIBUS DP system configuration
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
S7-300 industrial Ethernet
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
Mitsubishi FX series PLC programming of work process
Most PLC using batch input/output cycle work scan, running as user programs one by one in the order. A complete cycle can be divided into three stages:(A) enter the refresh phasePrograms at the start of monitoring program the machine to scan input each signal on all input ports, and in turn into the corresponding input … Continue reading Mitsubishi FX series PLC programming of work process
Introduction of various components in the Mitsubishi FX PLC (take FX2-64MR as an example)
A, input relay xX, y, there are countless normally open and normally closed contacts for programming use.Y section only for driven load using a normally open contact.You can see that each group is 8Input/output points determined in accordance with practical needs.Host + extended mode can be used to use number followed by addendum to the … Continue reading Introduction of various components in the Mitsubishi FX PLC (take FX2-64MR as an example)
PLC components function and address assignment
1. Enter image register (input relay) I(1) input image register worksInput relays the PLC interface to receive user input signal. PLC in the "relay" and the relay in the relay control system there are essential differences, "soft relay", which is essentially a storage unit. Each "input relay" coil is connected to the PLC inputs (such … Continue reading PLC components function and address assignment
PLC addressing modes
1. direct addressingDirect addressing is used directly in the instruction memory or registers the component name (logo) and the address number, reads or writes data directly to the specified region. Bit, byte, Word, double word addressing, as shown in Figure 2-8.2. indirect addressingIndirection operand does not provide direct data, but through the address pointer is … Continue reading PLC addressing modes
PLC addressing mode
Addressing modeProgrammable controller address is encoded inside the PLC elements, so that when the program execution can uniquely identify each component. PLC in a data store for each element is assigned a storage area and letters as a regional symbol and represents the type of component. Such as: digital input and write the input image … Continue reading PLC addressing mode
An understanding of PLC output select
In our PLC in general design, we used to use outputs for relay outputs, so you can do enforcement agents contact signal needs, such as some required AC voltage 220V, some need DC voltage, is a passive touch point, etc. In the output of the PLC-contact protection, generally use the RC protection, some protection is … Continue reading An understanding of PLC output select
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