1. Step Instruction (STL/RET) Step instruction is an instruction that is specially planned for sequential control. In the field of industrial control, many control processes can be completed by sequential control, and the use of step instructions to complete sequential control is not only convenient to complete, but also easy to read and modify.
There are two step commands in FX2N: STL (Step Contact Instruction) and RET (Step Return Instruction)
STL and RET commands can only be stepped if they are used in conjunction with the conditioner S. As STL S200 indicates, the normally open contact is called the STL contact, which has the symbol in the ladder diagram --, it has no normally closed contact. Let's use each conditioner S to record a work step, for example, STL S200 is useful (ON), then enter the step indicated by S200 (similar to the main switch of this step), start to perform the work that should be done in this stage, and determine whether the conditions for entering the next step are satisfactory. Once the signal is ON at the end of this step, the S200 is shut down and enters the next step, such as the S201 step. The RET command is used to reset the STL instruction. After the RET is fulfilled, it will return to the bus and exit the stepping state.
2. Condition handling diagram
The sequential manipulation process can be divided into thousands of stages, also known as steps or situations, each with different actions. When the transformation conditions between two adjacent conditions are satisfied, the transformation will be completed, that is, the transformation from the previous state to the next state fulfillment. We often use the Situation Handling Diagram (Utility Table Diagram) to describe this sequential manipulation process. Each condition is recorded with conditioner S, and X is the transformation condition. For example, when X1 is ON, the system changes from S20 to S21.
Each step in the situation transfer diagram consists of three contents: the content driven by this step, the transfer conditions, and the conversion goal of the command
Step drive Y0, when X1 is ON, then the system changes from S20 to S21, X1 is the transformation condition, and the goal of transformation is S21 step.
3. Instructions for the use of step commands
1) The STL contact is a normally open contact connected to the left bus, and if an STL contact is turned on, the corresponding situation is the active step
2) The contacts connected to the STL contacts are subject to LD or LDI commands, and the left bus is returned only after the RET has been fulfilled
3) STL contacts can drive the coils of Y, M, S, T and other components directly or through other contacts
4) Because the PLC only performs the circuit block corresponding to the active step, the output of the double coil is allowed when using the STL command (the sequential control program can repeatedly drive the same coil in different steps);
5) MC and MCR commands cannot be used in the circuit block driven by STL contacts, but CJ commands can be used6) STL commands cannot be used in interrupt programs and subroutines
|
More on that
|
Mitsubishi Q series PLC and GX Works2 connection method
01 USB connection
USB connection requires the device USB driver, generally the device will be actively driven after the installation of GX Works2 software, but at a single time due to anti-virus software or system reasons, or the device may not be available, then we need to manually drive the device to the accounting machine. The specific device method is ...
|
|
Introduction to Mitsubishi PLC network structure
1. The equipment layer/fieldbus CC-Link equipment layer is a field network that connects PLC and other control equipment, sensors and drive equipment, which is the lowest layer of the entire network system. The CC-Link fieldbus connection greatly reduces the number of wirings and improves the maintainability of the system. Whereas...
|
|
The role of Mitsubishi inverters in energy conservation and emission reduction
1. Descend the starting current of the motor
When the motor is started, due to the influence of inertia and load, there will be a large starting current. This current causes fluctuations in grid voltage and energy additions to the grid. The use of frequency converters can effectively solve this problem. After conditioning inverter ...
|
|
Mitsubishi PLC product line analysis
FX1S Series:
Mitsubishi PLC is an integrated small unit type PLC. And it has intact functions and communication functions and other scalability. If you consider the space and cost of the installation, it is an ideal choice.
FX1N Series:
It is a popular PL with strong functions launched by Mitsubishi Electric ...
|
|
Mitsubishi PLC FAQs
1. How to connect a PNP three-wire proximity switch to the input port of FX3U PLC.
Answer: The signal output termination of the PNP three-wire system close to the switch is connected to the input port of the PLC, such as X0, and the 0V end of the PNP type close switch to the 0V terminal on the PLC, and the S/S terminal and the 0V terminal ...
|
|
Mitsubishi PLC controls the control method of the inverter
1. Use the switching signal of PLC to control the inverter
The output point and COM point of the PLC (MR type or MT type) are directly connected to the STF (forward engine), RH (high speed), RM (medium speed), RL (low speed), and SG input ports of the inverter. The PLC can control the inverter through the program.
|
|
Mitsubishi fx2n AC power supply · DC input table of discontinued replacement models
FX2N-16MR Discontinued Replacement: FX3U-16MR/ES Input: 8 DC 24V Drain Output: 8 Relay
FX2N-16MR-ES/UL Discontinued Replacement Model: FX3U-16MR/ES Input: 8 points DC24V drain/source output: 8 points Relay
FX2N-16MS ...
|
|
Mitsubishi FR-E540 inverter parameter settings
1. Press the mode button continuously until you enter the parameter writing state, and the LED display is: Pr.O
2. Press the upper button to adjust the parameter to the Pr.34O parameter.
3. Press SET, the LED displays the initial value of Pr.340, press ...
|
|
OC troubleshooting method reported during inverter operation
1. For the test of the power output capacity of the driving circuit, to detect the pulse terminal signal such as GU\EU, it is not possible to have voltage (or pulse waveform) alone, and the current output capacity should be detected, and then admit whether it is normal;
2. Admit the defects of the current transformer. My solution is to use the ...
|
|
Mitsubishi plays an important role in the paper industry
From raw material pulp to papermaking, and then through packaging and logistics, the paper towel finally completes the "transformation" to meet customers. The impression of packaging and quality, coupled with the comprehensive effect of multiple specifications, traceability, high standards, authoritative certification and other factors, will finally win the hearts of customers, and then establish a trustworthy ...
|
|
Features of the MELSEC iQ-R series of programmable controllers
1. Routine control is consistent with safety control
In the MELSEC-QS series, it is necessary to prepare a system for conventional control and a system for safety control. With the MELSEC iQ-R series of safe programmable controllers, it is possible to combine conventional and safe control into a single system.
Quiet...
|
|
Mitsubishi Electric develops technology for high-power-density converters with embedded components
TOKYO, March 25, 2020 – Mitsubishi Electric Corporation (TSE: 6503) today announced that it has developed a new technology that integrates power devices, passives, sensors, and other embedded components on the same substrate and performs the dispensing at 100kW (continuous) power.
|
|
Inverter life extension method - Mitsubishi
First, the frequency converter should not be installed on the equipment with a sensation, because the main circuit connection screw in the frequency converter is simply loose, and many frequency converters are damaged due to this reason.
Second, the wiring problem: the input end of the inverter is connected to an air The initial maintenance current should not be too large, ...
|
|
Mitsubishi Electric appeared at the 2021 China Smart Expo
From August 23 to 25, 2021, the 2021 China International Intelligent Industry Expo (hereinafter referred to as the Smart Expo) was held in Chongqing International Expo Center. Mitsubishi Electric (China) ...
|
|
Mitsubishi PLC encryption process
The encryption process is as follows:
** Open the serial port for the first time
[00000000] IOCTL_SERIAL_SET_BAUD_RATE Baud Rate: 9600 (Set baud rate here)
[00000000] IOCTL_SERIAL_SET_LIN ...
|
|
Mitsubishi inverter FR-D700 series selection
Q: When will I choose the D740 series inverter?
A: D700 is a multi-function compact inverter, more portable, less than E700, the general function can be basically realized, simple start and stop can use D700 series.
Q: How should Mitsubishi inverter D740 ...
|
|
Mitsubishi PLC has a built-in time adjustment step
1. TWR (Time Write) command
Instructions to write time presets to the built-in real-time clock: Clock information is written to the TWR (Time Write) command. The sequence number of the action instruction is FNC167, [S ·] T, C and D can be used, and only 16-bit operations can be used, accounting for 5 program steps.
The work of the directive ...
|
|
Methods for shortening the scanning cycle of PLC programs – Mitsubishi
1. Try to avoid using "double words" when you can use "words", and try to prevent using real numbers when you can use integers.
2. Give priority to the use of surplus (other than hardware connection) IB, IW, ID, QB, QW, QD, followed by M and S;
3. Try to prevent the transformation of data types, ...
|
|
Mitsubishi PLC advantages
Discrete control and motion control, Mitsubishi's instructions are abundant, there are dedicated positioning instructions, control servo and stepping are easy to complete, to complete some messy action control is also Mitsubishi's strength, and Siemens is weaker in this area, there is no special instruction, do servo or step positioning control is not ...
|
|
Mitsubishi Electric Europe Ltd. acquires AQS, a Sweden air conditioning distributor
TOKYO, April 2, 2020 - Mitsubishi Electric Corporation (TSE: 6503) announced today that its European subsidiary, Mitsubishi Electric Europe Ltd., acquired all the shares of AQS PRODUKTER AB, a Sweden company in the comfort, craft industry, on April 1.
|
|
Contact
working hours
