Showing posts from May, 2018


The main reason is that the program written by PLC has made mistakes, some of which may be logical errors, or may be input errors. You have to check it out. Programmable logic controller (programmable logic controller), which uses a class of programmable memory used in its internal storage program, executes user oriented instructions such as logic operation, sequence control, timing, counting and arithmetic operation, and controls various types of machinery or production process by digital or analog input / output.


ALM refers to the alarm, which may be PLC running some problems.

MITSUBISHI PLC’s fault light prog.e light

PROG.E is a program error indicator. This light is usually a mistake on the program. You can look at the error number in the special register D8060-D8069 to determine where the error is, and let’s look at the programming manual.

Proge alarm for MITSUBISHI PLC

“PROG.E” LED flashes, it is an error indication. The light LED flashes when the timer, the constant of the counter, the circuit, the battery voltage, the abnormal noise, the conductive foreign object, and the contents of the program memory are changed. Please check the program again to check whether there is any conductive foreign matter mixed, whether there is a serious noise source, and check the indication value of the battery.

MITSUBISHI pLC, alarm display ERROR

Error display “[EPROR] LED scintillation” When the equipment exceeds the specification, the circuit is not good, or there is abnormal noise, conductive foreign matter mixed into the cause of the changes in the contents of the program memory. The LED will flash, the programmable controller STOP, and the output will change to OFF. In this case, please reconfirm the program and check it.
There are no conductive foreign bodies and high intensity noise sources. “[ERROR] LED light” (CPU) due to the mixing of conductive foreign matter inside the programmable controller or external abnormal noise, it results in runaway or over operation cycle. 200ms, WDT error, the LED lamp is bright, programmable controller STOP, and all outputs are OFF. Power failure reset, if the programmable controller returns to normal, please check whether there is abnormal noise source, whether there is conductive foreign matter mixed. In addition, please check whether there are third kinds of grounding according to the specifi…

What does M8147 mean in MITSUBISHI PLC, under what circumstances is 1, and under what circumstances is 0?

MITSUBISHI PLC special relay M8147 monitors Y0 pulse output, and M8148 monitors Y1 pulse output.
The role of special relay M8147 and M8148 is that when Y0 and Y1 have pulse output, M8147 and M8148 are set at 1 and no pulse output is set at 0.a


This is the use of the variable address.
The final address of M3000V1 depends on the value of V1. If V1 equals 100, then the final address is M [3000+V1] =M3100..

How to count the MITSUBISHI PLC counter

Parallel the Y0 and C0 at the output end. When the Y0 triggers the output once, the C0 will count once.
The counter must have a reset instruction. Technology completion triggers RST C1 reset
If you want to display the count times on the touchscreen, use the MOV command to send the C1 count to register D.
The display component of the touchscreen should select the display address, and the address is the D register you sent. For example, D1 D2 and so on. The display screen can display the data of the register.
The CD port of touch screen is the power supply interface, usually 24V DC. The communication port is the COM port. And that is to download the USB port. There is no technical port. Counting, timing and so on in PLC, all kinds of data are communicated through COM port.

How to use the C counter in MITSUBISHI PLC

A cylinder pushes the cylinder two times. How do we use the counter C to complete it?
First choose the condition, that is to say which input signal to count, I see the cylinder limit position sensor on the line, the cylinder is in place after the sensor bright, that is, the input signal, and then count the counter once,
LD x1
Set C1 K2

How to use counter C and auxiliary relay M in MITSUBISHI PLC programming

1. internal counter C
The internal counter counts the internal signals (such as X, Y, M, S, T, etc.) when performing the scan operation. The connection and disconnection time of internal input signal should be longer than that of PLC.
(1) the 16 bit increase counter (C0 ~ C199) is 200 points, of which C0 ~ C99 is a general type, and 100 points of C100 to C199 are a power break retention type. This kind of counter is an added count. It sets a set value before application. When the number of input signals (rising edge) is added to the set value, the counter action is often closed and often closed. The setting value of the counter is 1~32767 (16 bit binary), and the setting value can be set indirectly through the specified data register in addition to the constant K setting.
The following example illustrates the working principle of a universal 16 bit increment counter. As shown in Figure 1, X10 is the reset signal and C0 is reset when X10 is ON. X11 is counting input. Whenever X11 is conne…

All special auxiliary relays of FX series PLC

The MITSUBISHI PLC special auxiliary relay has 256 points, which are used to represent some of the states of the PLC, providing clock pulses and signs (such as the carry, the bit of the bit), setting the running mode of the PLC, or for the step control, the prohibition of interruption, the setting counter is counting or subtracting count. Special auxiliary relays are divided into two types:
(1) contact use type
The system program of PLC drives the coils of the contact use special auxiliary relay to use the contacts directly in the user program, but not their coils. Here are several examples:
M8000 (operation monitoring): when PLC executes user programs, M8000 is ON; when execution stops, M8000 is OFF.
M8002 (initialization pulse):M8002 is only ON (see Figure 3-8) in a scanning period of the M8000 changing from OFF to ON state (see Figure 3-8), which can be used to initialize or give initial values to the components with a power failure retention function with the constant open contacts of…

mitsubishi plc timers

The manual says, using a special timer in T192 ~ subroutine and interrupt subroutine in T199, I now subroutine timer is not enough, can I use the general timer in the subroutine, in addition, for the 192~199 general and special Godson program timer in the end what is the difference? Timer: T0~T199 (200 point) is the timer of 100ms (set value: 0.1~3276.7 S); T200~T245 (46 point) is the timer of 10ms (set value: 0.01~327.67 S); T246~T149 (4 points) is a 1mS cumulative timer (set value: 0.001~32.767 S, power loss retention, that is, interrupt action); 6 Cumulative timer (set value: 0.1~3276.7 S, power loss maintenance, that is, interrupt action).
If T192 to T199 and T246 to T249 are used in subroutines or interrupt programs, the current value of the timer is modified when END instructions are executed. When the current value of the timer is equal to the set value, its output contacts act when executing the timer coil instruction or the END instruction. If the timer is not used, the work of…

MITSUBISHI PLC’s timer to the time contact action Is it immediately reset or maintained

In MITSUBISHI PLC, timers can be divided into retention type and non maintenance type (taking FX series as an example). If T0–T199 is not maintained, T200–T250 is maintained. For your problem, it should be answered: if you use any of the T0–T199 in the program, the contact will act when the timer goes to the time. As long as the condition of the timer coil is true, the contact is kept, and the contact will be reset immediately as long as the condition of the timer coil is driven. If you use any of the T200–T250 in the program, the contact will act when the timer goes to the time. If the condition of driving the timer coil is true, the contact is kept, even if the condition of the driver timer coil is false, the contact is still kept, you need to reset the RST instruction, or MOV K0 T2XX. Reposition.

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