How to deal with Mitsubishi PLC failures

01. Base system problem

In Mitsubishi PLC, there are binary, octal, decimal, 10, 2-10 (BCD), etc., we need to master the conversion of 2-8 base.

2-8, remember the base number from the back, divide every 3 into a group, and each group is converted into 8 base, such as 1110111-1 110 111-167;

8-2, separate each of the octal numbers, and then convert each bit into a binary system and combine them. e.g. 157-1 101 111-1101111;

2-16 conversion, 2-16, the binary number is remembered from the back, every 4 are divided into a group, and each group is converted into hexadecimal, such as 1011111-101 1111-5F

16-2, separate each hexadecimal number, and then convert each bit into a binary system and combine them. Such as 47-0100 0111-1000111

In the FX series PLC, X,Y is used in occimal system, that is, X0-X7, X10-X17, Y0-Y7...... There is no X8, and other soft components are in decimal format.

In the A and Q series PLCs, X and Y use hexadecimal system, that is, X0-XF, X10-X1F, Y0-YF

How to deal with Mitsubishi PLC failures

How to deal with Mitsubishi PLC failures

02. Programming software

FX-GPWIN is only suitable for FX series PLC programming

GX-Developer is suitable for FX, Q, A series PLC programming

GX-WORK2 is suitable for FX, Q, L series PLC programming

When installing GX-Developer, please first install the SETUP in the ENVMEL device folder in the device environment, and then click SETUP in the device folder when the device is finished. When setting up, please note that there will be an option in the middle of the device, and be careful not to tap the device into monitoring mode.

03. Programming line problem

There are several main programming cables: SC-09, USB-SC-09, and USB (printer cable).

When using SC-09, if the computer does not have RS232 interface, it needs to be equipped with USB/RS232 converter, when purchasing the converter, please be sure to explain to the merchant that it is used for PLC programming. First of all, the device driver is required, and after the device is driven, there will be a virtual RS232 port number of the converter in the device manager of the computer, such as COM4, and this port number should be selected when downloading and uploading during programming.

When using the USB-SC-09 cable, the device driver is required, and after the device is driven, there will be a virtual RS232 port number of the converter in the device manager of the computer, such as COM4, and this port number should be selected when downloading and uploading during programming.

When the Q series PLC is connected with a USB cable, the first connection will find new hardware, and the driver will be in the device directory MELSEC\Easysocket\USBDrivers.

04. Array problem

It is not uncommon to see people asking this question like MOV H0003 K1Y000

First of all, you need to understand that H and K H are generally hexadecimal values, and K is decimal values.

Before you understand the meaning of KmXn, KmYn, KmMn, etc., this is like an array, an array of 4 adjacent elements, which can represent 0-1111 in binary, which is 0-5 in decimal and 0-F in hexadecimal. Km indicates that there are several arrays, and Xn, Yn, etc., indicate the beginning bit of the array. For example, K1Y0 is Y0, Y1, Y2, Y3, where Y0 is the low position and y3 is the high position, and the corresponding data should be written Y3Y2Y1Y0.

05. Pulse output problem

If you want to output pulses, you need the MT model, and of course, the MR model can also be changed to transistors if you are good enough to change the relay such as Y0 and Y1 to transistors.

06. The problem of peripheral imitation potentiometer

There is an imitation potentiometer on the periphery of FX0N, the corresponding potentiometer address is D8013, and the starting value changes between 0 and 255 with the adjustment of the potentiometer.

There are two imitation potentiometers in the periphery of the FX1N/FX1S, the corresponding potentiometer address is D8030/D8031, and the starting value changes between 0 and 255 with the adjustment of the potentiometer.

The FX2N does not have an imitation potentiometer in the periphery.

The peripheral potentiometer can be expanded via an expansion board.

The use of peripheral potentiometers, such as timers with adjustable timing time, etc., if the timing time of the demand is 2-8S, then the demand is converted as follows

07. About the moment at that time

It is assumed that there is no time in FX0N

FX1N/1S, FX2N Time of Time, Seconds D8013, Minutes D8014, Hour D8015, Day D8016, Month D8017, Year D8018, Day of the Week D8019.

If you need to turn on and off at 8:00 and turn off at 17:00

　　LD>= D8015 K8

　　SET Y0

　　LD>= D8015 K17

　　RST Y0

08. Mutual conversion of binary and decimal systems

This can be classified into N-base and decimal conversions.

First, look at the conversion of decimal to N, and choose the divisor remainder, that is, divide the decimal number by N to get the quotient and remainder, and divide the quotient by N to get the quotient and remainder...... This is repeated until the quotient is 0, then all the remainders are lined to the left, and the remainders obtained first are placed to the right, and the resulting set of numbers is the N base number of the decimal number. For example, if the decimal number 12 is converted to a decimal system, then 12/7 = 1 is left as 5, and 1/7 = 0 is left as 1, so the base number is 15. For example, if the decimal number 9 is converted into a binary number, then 9/2 = 4 and 1, 4/2 = 2 and 0, 2/2 = 1 and 0, 1/2 = 0 and 1, so the binary digit 1001.

Then look at the conversion of N-base numbers into decimal numbers, first take the value of each bit * the weight of the bit to get the product, and then add the product of each bit to get the sum of the number is the decimal number of the number. The weight of the M bit of the base N = the (M-1) square of N.

For example, 23 in decimal 7 to decimal = 2×7(2-1) +3×7(1-1) =2×7+3×1=17. For example, 37 in octal is converted to decimal = 3×8(2-1) + 7×8(1-1) = 3×8+7×1=31.

09. About widening and model description

　　FX 1 N-30 MR-001

FX is a series number Mitsubishi Micro PLC

1 is a series sequence,

N is extensible, if S cannot be extended

30 indicates that the total number of input and output points is 30 points

M is the host, and E is the extension

R is the relay output, T is the transistor output (when the front is E, X is the input, YR is the relay output, YT is the transistor output, YS thyristor output) 001 is the AC power supply, D DC power supply.

Although S is not an expandable product, if you only need to expand X, Y, AD and DA below 4 points, you can choose the function expansion board, such as FX1N-4EX-BD, FX1N-2EYT-BD, FX1N-2AD-BD, FX1N-1DA-BD.

When the input/output point is expanded, the number starts with the next 8 bits of the host, such as FX1N-30MR, extended FX1N-8EX, FX1N-8EYR, then the input of the host is X0-X7, X10-X17, the output is Y0-Y7, -Y10-Y15, the extended input is X20-X27, and the output is Y2-Y27.

10. Problems in the use of programming software

Mitsubishi programming software can directly input instructions in the form of sentence tables when modifying the ladder diagram, and there is no need to use [ ] to select them one by one.

When modifying, pay attention to the input method in English, and pay attention to the difference between 0 and O.

How to deal with Mitsubishi PLC failures

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