MITSUBISHI PLC’s PROG light

MITSUBISHI PLC’s PROG light

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 light on MITSUBISHI PLC

ALM light on MITSUBISHI PLC

ALM refers to the alarm, which may be PLC running some problems.
MITSUBISHI PLC’s fault light prog.e light

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

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

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 specifications and external wiring of the [4. power circuit.
The results of inspection should be checked according to the 8.1 item if there is a change in the LED light. If the LED still keeps the light state.
Please confirm that the program operation cycle is too long.
If all the checks are carried out, the light state of the [ERROR]LED can not be removed, and some kind of failure should be taken into consideration in the programmable controller.
What does M8147 mean in MITSUBISHI PLC, under what circumstances is 1, and under what circumstances is 0?

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
M3000v1 in MITSUBISHI PLC

M3000v1 in MITSUBISHI PLC

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

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

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

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 connected to a counter, the current value is increased by 1 (note that X10 is disconnected, and the counter will not reset). When the counter counts the current value to 10, the output contact action of the counter C0 is Y0 connected. After that, even if the input X11 is connected again, the current value of the counter remains unchanged. When the reset input X10 is connected, the RST reset command is executed, the counter is reset, the output contact is reset, and the Y0 is disconnected.
2. General auxiliary relay (M0 ~ M499)
The FX2N series has a total of 500 points with auxiliary relay. When the general auxiliary relay is running at PLC, if the power suddenly goes off, all the coils are OFF. When the power is switched on again, except for the external input signal, the remaining ON will remain OFF, and they will have no power failure protection function. General auxiliary relay is often used as auxiliary operation, temporary storage and shift in logic operation.
According to needs, the M0 to M499 can be changed to power failure to maintain auxiliary relay by program setting.
Power interruption relay (M500 ~ M3071)
The FX2N series has 2572 M500 to M3071 power cuts to maintain auxiliary relay. Unlike ordinary auxiliary relay, it has the function of power failure protection, that is, it can remember the instantaneous state of power interruption and reappear its state after re energizing. It can maintain its original state when the power supply is cut off, because the lithium battery in PLC keeps the contents of their image registers when the power is interrupted. Among them, M500 ~ M1023 can be set as universal auxiliary relay by software.

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