The basic logic instructions of the Mitsubishi FX series plc

Fetch Command and Output Command (LD/LDI/LDP/LDF/OUT)

The basic logic instructions of the Mitsubishi FX series plc

(1) LD (take instruction) - the instruction that the normally open contact is connected with the left bus, and each - logic line that starts with the normally open contact is used with this instruction;

(2) LDI (Negative Command) A normally closed contact is connected to the left bus, and every logic line that starts with a normally closed contact is used with this instruction;

(3) LDP (take rising edge command) The rising edge detection instruction of the normally open contact connected to the left busbar is only for the specified bit component. Rising edge (OFF-→ON) when the scan cycle is turned on;

(4) LDF (take falling edge command) falling edge detection command of normally closed contact connected with the left bus;

(5) OUT (Output Instruction): An instruction to drive a coil, also known as an output instruction.

Contact Series Command (AND/ANI/ANDP/ANDF)

1) AND (and Instruction) - A normally open contact connects the instruction in series to complete the logical "AND" operation;

2) ANI (and counter-directive) - a series of NC contacts to connect the command to complete the logical "and not" operation;

3) ANDP. ascending edge detection tandem connection command;

4) ANDF descending edge detection tandem connection command;

Contact Parallel Command (OR/ORI/ORP/ORF)

1) OR (or instruction) is used for the parallel connection of a single normally open contact to complete the logical "OR" operation;

2) ORI (or non-directive) for parallel connection of a single normally closed contact to complete the logical 'or not' operation;

3) ORP Rising Edge Detection Parallel Connection Command;

4) ORF falling edge detection parallel connection command;

Block Operation Instructions (ORB/ANB)

1) ORB (block or instruction) is used for parallel connection between circuits with two or more contacts connected in series;

ANB (Blocks & Instructions)

1) It is used for series connection between circuits with two or more contacts connected in parallel;

Set & Reset Commands (SET/RST)

1) SET (set command) its function is to set and adhere to the operated policy element;

2) RST (Reset Command) resets the operated guideline element and maintains the zeroing condition. The application of SET and RST commands, when X0 is normally turned on, Y0 becomes the ON state and - insists on this state, even if X0 disconnects the ON state of Y0 remains unchanged; Only when the normally open and closed of X1 does Y0 become OFF and insist, even if X1 is normally open and closed, Y0 is still in OFF condition;

Differential Instruction (PLS/PLF)

1）PLS（。 Rising Edge Differential Instruction) is generated on the rising edge of the input signal - a scan period of pulse output;

2) PLF (Falling Edge Differential Command) generates a scan cycle pulse output on the falling edge of the input signal, uses the differential command to detect the edge of the signal, and controls the status of Y0 through set and reset commands;

3) The policy elements of the PLS and PLF directives are Y and M;

4) When using PLS, the policy element is ON only in one scan cycle after the drive input is ON, and M0 is ON only in one scan cycle when the normally open contact of X0 is broken to on; When using the PL F command, it only uses the falling edge of the input signal to drive, and the rest is the same as PL S;

Master Command (MC/MCR)

1) MC (Master Control Command) is used for the connection of common series contacts. After the MC is fulfilled, the left bus is moved to the rear of the MC contact;

2) MCR (Master Control Reset Command) It is the reset command of the MC command, that is, the MCR command is used to restore the position of the left bus; In programming, it is often the case that multiple coils are operated by one or a group of contacts at the same time, and if the same contacts are connected in the control circuit of each coil, many memory cells will be occupied, and this problem can be handled by using the master command.

MC, MCR instructions, use MC NO M100 to complete the left bus right shift, so that Y0, Y1 are under the control of X0, during which N0 indicates the nesting level, and the number of uses of N0 in the non-nesting structure is unlimited; MCR NO was used to recover to the original left bus condition. If X0 is disconnected, it will cross the command between MC and MCR.

Warehouse Directives (MPS/MRD/MPP)

Warehouse instructions are new basic instructions in the FX series, which are used in multiple output circuits and bring convenience to programming. In the FX series PLCs, there are 11 memory cells, which are specially designed to store the intermediate results of program operations, called stack memory.

1) MPS (Stack Instruction) sends the calculation result into the first segment of the stack memory, and at the same time moves the data sent from the previous to the lower segment of the stack in turn;

2) MRD (Read Stack Instruction) reads out the first segment of data from the stack memory (the last data entering the stack) and the data continues to be stored in the first segment of the stack, and the data in the stack does not move;

3) MPP (Stack Out Instruction) reads out the first data of the stack memory (the last data entering the stack) and the data disappears from the stack, and at the same time moves other data in the stack up in turn;

Stepper instructions for FX series PLCs

1. Step Instruction (STL/RET)

Step commands are instructions designed for sequential manipulation. 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 correct.

There are two stepper commands in FX2N: STL (Step Contact Command) and RET (Step Back Command).

STL and RET commands can only have a stepping function if they are paired with conditioner S. For example, STL S200 indicates that the status normally open contact is called the STL contact, and its symbol in the ladder diagram is -|| | It has no normally closed contacts. For example, STL S200 is useful (for 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 judge 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 S201. 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.

The basic logic instructions of the Mitsubishi FX series plc

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