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
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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
Difference between PCC and PLC, and IPC
Programmable computer controller, referred to as PCC (programmable computer controller), as a new concept in the mid-90 in the industrial sectors, which is different from the programmable logic controller PLC (program logic controller) and IPC IPC (industry personal computer) of a new generation of programmable computer controller, Represent the development trend of industrial control technology.PCC … Continue reading Difference between PCC and PLC, and IPC
Siemens PLC basic classification
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
S7-200 programs instructions cannot be used
"S7-200 programs, there are those that do not can be used? I did a lot of subroutines, subroutine repeatedly calls without any problems, but there is a subroutine is invoked, each loop inside the first command that calls the subroutine works, while the second call is null and void. If this subroutine and then recopy … Continue reading S7-200 programs instructions cannot be used
PLC sequential control design method
Sequential control design method is the basic idea of the system connected to the order of a working cycle is divided into several stages, these stages are known as step (Step). Sequential function chart (SFC) is mainly composed of steps, to the connections, transformations, transitions, conditions and actions.Figure 1 is a diagram on how to … Continue reading PLC sequential control design method
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