Step instructions (STL) is the use of internal software components, processes stepping sequence control program control instructions. Step return instructions (RET) refers to the condition (s) process is finished, to return to the main program (bus) instructions.Attention when stepping instructions1. Stepper point is only normally open contact, instead of normally closed contacts, said the instructions … Continue reading Mitsubishi PLC ladder step instructions [STL],[RET]
Mitsubishi FX series PLC constants (k, h)
State relay (s) within the PLC "soft relay", and enter a relay (x) and the output relay (Y), there are countless on the normally open and normally closed contacts, if not step into the soft components can be used as General auxiliary relay (m). Total state relays within the FX series 1000, S0~S9 are mainly … Continue reading Mitsubishi FX series PLC constants (k, h)
The three ways of realization of communication between PLC and PC Internet
Numerous suppliers of various types of PLC, each of them has advantages and disadvantages, to meet user needs, but in terms of morphology, composition, functions, and programming varies, no uniform standards, the manufacturers to develop communication protocols also vary. At present, the following three main ways of communication between PLC and PC connectivity:1) by using … Continue reading The three ways of realization of communication between PLC and PC Internet
PLC timer (t)
Of timer in PLC equivalent to relays time relays in the system.It has a set value registers (one word), a current values of registers (one word) and an image uses to store its output contact status register (binary bit), these three storage units using the same component number. FX series PLC timers are divided into … Continue reading PLC timer (t)
Mitsubishi FX series PLC analog control functional unit
A, analog input/output modules1.F2-6A input characteristicThe output characteristics of 2.F2-6ASetting and adjustment of 3.F2-6A(1) input type selectionInput type selection (0~5) v, (0~10) and v (0~20) when mA, each channel selection. If a channel selection (4~20), mA, then all of your channel needs to be set to (4~20) mA.(2) set the output typeSet the output type … Continue reading Mitsubishi FX series PLC analog control functional unit
Mitsubishi FX series PLC high-speed counter (HSC)
1. Overview of high speed counter21 C235~C255 share PLC high-speed counter 8 high-speed counter inputs X0~X7, an input at the same time can only be used for a high speed counter. 21 counters are 32-bit plus/minus counter (see table 3-7). Different types of counters can be used simultaneously, but their high speed counter input cannot … Continue reading Mitsubishi FX series PLC high-speed counter (HSC)
FX series PLC display and graphic operating Terminal
ith the development of factory automation, micro-PLC control more and more complex and advanced, FX series PLC is equipped with a wide variety of display module and graphics operator terminals as a human-machine interface.1. Display module FX1N – 5DMFX1N – 5DM has 4 keys and a backlit LED display, installed directly on the FX1S, FX1N, … Continue reading FX series PLC display and graphic operating Terminal
Two main extensions of Mitsubishi FX series PLC
The delay has a maximum value of FX series PLC, such as delay greater than the maximum value of the timer can be used more than one timer delay relay.The specific method is:(1) before using a normally open start the next timer timer.(2) counter and timer work.
Design of PLC control system the main steps to be followed and the content
(1) technical analysisIn-depth understanding of process control object, features, requirements, and dividing control of all phases, summarized the various stages of, and between the various stages of transition conditions, draw the flowchart control flow chart or function. (2) select the appropriate PLC type When you select the PLC model, mainly consider the following points: 1 choice of functions. … Continue reading Design of PLC control system the main steps to be followed and the content
PLC program design
PLC programming is generally divided into the following steps:1. programming preparationsGetting ready for a program is to understand the whole control system functionality, scale, control, input/output signals of type and quantity, special features of the interface and the relationship with the other device, contents and methods of communication, the entire concept of the control system … Continue reading PLC program design
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