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  1. Hi Everyone,I have a customer that needs a CQM1H (CPU51) replaced. They purchased the processor new-old-stock from a source they found online. It arrived in the original packaging and had the safety label around the top of the unit, so it seems that it is as advertised and no need to suspect that it would have problems. I purchased secondhand, a power supply to attach to it and program it from the bench instead of in the machine. The customer also provided me with an SD card containing the project file(s) for the machine. I am able to load the project in CX-ONE (running on Win 7) just fine. My computer has a native serial port (COM1) and I built a programming cable to work with the DB9 peripheral port according to a diagram I found online.The processor powers up right away with the ERR/ALM continuously on. No other LEDs came on initially, and after a bit of playing around with communications settings, I finally landed the right protocol and my computer seemed to identify the processor correctly. I compiled the source and attempted a transfer to the PLC. I got some failed message (or maybe messages) at the end of the transfer. It did seem to send all of the binary code, it just ended with an error message that I unfortunately didn't write down or grab a screenshot.Anyway, what I have now is a PLC processor with the ERR/ALM LED on always, I've never seen it in RUN mode, and now after the programming attempt, I'm seeing the COMM LED strobing at about a .5sec frequency (with or without a cable attached to the peripheral port), AND I cannot get CX-Programmer to again acknowledge the processor anymore. I'd like to reset this back to the way it arrived to me, but can't figure out how to make that happen offline. The DIP switches don't seem to cause that effect. I should say also that the DIP switch settings are all OFF except 3 and 7.Any help is much appreciated!Thanks,John  
  2. Hello all, I'm commissioning a project and connected a 2 wire pressure transmitter Danfoss MBS33 060G3039 to a FX2N-4AD module attached to a FX3U base. When I connect a 4-20mA simulator it all works fine, my signal is correct 0-4000=4-20mA and my HMI shows a correct value however when i connect to the Danfoss transmitter a mismatch occurs. It starts with a 5,5mA signal at 0,0 BAR so my HMI shows already 1,0 BAR instead of 0,0. It seems, when I increase the pressure, that is is a linear up going signal. somehow I think it is a hardware connection because with the simulator at the input it works OK but I can not find an other way to connect than inthe manual. Is there an other way with resistors or something to allign the impedance to the PLC module? Best regards, Theo
  3. FX2N 4AD2DA

    Hi,    Doas anyone have any samples how to configure +10 analog outpu for china version of mitsubishi PLC , and how can i test if configuration work  ?
  4. Hi everyone,  I am new to Mitsubishi PLC. I am trying to see from where Run or speed commands goes to Servo. I have MELSEC FX2M-32MT with FX2N-1PG cards for the Servo and I am using GX Developer 8.91v  Also, I would like to mention that initially I found out that BATT V light was lit so here what I didi. >I replaced the battery within 20 second while powered ON. Before changing the battery I took upload of the program successfully.  >I have cleared PLC memory and re downloaded the program.  > Checked Memory addresses M8005 8006 both are Low.  Now, when I am trying to run  my machine it is not giving output to two Servos while a conveyor operates when started from the HMI so it means program is inside PLC, right ? Program is attached if someone wants to have a look.  labeling mc 300322.rar
  5. Mitsubishi Fx2n Modbus rtu vfd

    Hello everyone, may you all bless with the best. Can anyone please help me on connecting and programming In Modbus rtu INVT CHF-100A vfd with FX2n having rs485-bd moblue. I want to connect 11 vfd and one fx2n plc also 
  6. Mitsubishi Fx2n Modbus rtu vfd

    Hello everyone, may you all bless with the best. Can anyone please help me on connecting and programming In Modbus rtu INVT CHF-100A vfd with FX2n having rs485-bd module. I want to connect 11 vfd and one fx2n plc also .
  7. Mitsubishi Fx2n Modbus rtu vfd

    Hello everyone, may you all bless with the best. Can anyone please help me on connecting and programming In Modbus rtu INVT CHF-100A vfd with FX2n having rs485-bd module. I want to connect 11 vfd and one fx2n plc also 
  8. E615 hmi print garbage value

    Hi, I am using 615 beijer hmi with fx2n plc and it was printing data correctly before changing the hmi i have download the progame to new hmi but after that it is showing garabge value at print out how can i solve the problem Thanks  
  9. Hello All, I am currently stuck at fx2n 232bd which has to communicate with proface 4301tw hmi , although i have many hmi's available but i am unable to communicate this with hmi, almost tried every thing i just wanna know the exactly settings in gp-prox fig 1 ...  and fx cpu parameters anyone experienced guy ?? Help would be greatly Appriciated. Thanks
  10. Dear all, I have a FX2N-20MR chinese semi-clon of a Mitsubishi PLC. It has only a serial DB9 port that cannot be removed or exchanged (which is possible in the Mitsubishi original PLC). I wonder if I can make a simple SCADA system using that port and just one computer. I am reading this post: https://forums.mrplc.com/index.php?/topic/9653-fx-series-and-modbus/ And I am wondering how I can do what it is suggested there in the second message:  to use a free FB block, available in GX IEC (but not in GX Developer), which will communicate modbus via a standard RS232 BD board. Later on it mentions a library called ModbSFX. That message is from 15 years ago so I am wondering if now there is some other way to do it, perhaps some other software has that functionality? I don't have GX IEC. I am a student trying to make a project so I would like a cheap and simple solution. Any help to do so will be very welcome. Thanks Regards Marcelo
  11. GX WORKS 2 with MX component

    I'm trying to simulate the proface HMI and my ladder program using the MX component " communication setup utility". I followed all the steps on a tutorial vid however an error pops'up (check the attached file). i was wondering if you can help. Thanks in advance.
  12. MITSUBISHI A2SH-S1 CPU

    Hey i want to know that in mitsubishi A2SH-S1 CPU how can i determine that battery voltage is what and if battery voltage is low then i want to on an output so that i can change the battery with the new one so that my program does not gets erased. 
  13. Siemens S5-95U PLC and Battery Concern

    Hi All, We have a hydraulic press that is being controlled by Siemens S5-95U PLC . Lately the S5-95U has been randomly stopping during operation thus causing the hydraulic press to stop running. However the S5-95U instantly returns to RUN status after stopping. This is the first time it has happened after a decade of service. Prior to the random stops issue, around January 2021 the S5-95U completely stopped and the program in the RAM was erased so we had to replace the PLC battery and restore the program with our backup. Strangely, the PLC battery we replaced still had 3.4VDC upon checking. What's even more baffling is that even after we replaced the PLC battery with a new one,  Battery LED is still yellow although the program is still retained in the RAM. In summary, we have two concerns: 1. S5-95U randomly stops and resumes during operation ever since we were forced to replace the PLC battery and restore the program. 2. PLC battery has been replaced but the Battery LED is still yellow but the program is still retained in the RAM.   I have a suspicion that the two concerns I mentioned above are somehow connected but I lack the technical expertise to diagnose. I'm hoping someone can help me figure out our issue. Worst case, I think our S5-95U needs to be replaced.   Thanks,  
  14. Hi All, We have a hydraulic press that is being controlled by Siemens S5-95U PLC . Lately the S5-95U has been randomly stopping during operation thus causing the hydraulic press to stop running. However the S5-95U instantly returns to RUN status after stopping. This is the first time it has happened after a decade of service. Prior to the random stops issue, around January 2021 the S5-95U completely stopped and the program in the RAM was erased so we had to replace the PLC battery and restore the program with our backup. Strangely, the PLC battery we replaced still had 3.4VDC upon checking. What's even more baffling is that even after we replaced the PLC battery with a new one,  Battery LED is still yellow although the program is still retained in the RAM. In summary, we have two concerns: 1. S5-95U randomly stops and resumes during operation ever since we were forced to replace the PLC battery and restore the program. 2. PLC battery has been replaced but the Battery LED is still yellow but the program is still retained in the RAM.   I have a suspicion that the two concerns I mentioned above are somehow connected but I lack the technical expertise to diagnose. I'm hoping someone can help me figure out our issue. Worst case, I think our S5-95U needs to be replaced.   Thanks,  
  15. FX-2NC-32MT Battery & Communication Cable

    Hi, FX-2NC-32MT PLC need to change Battery, Can you please tell me the battery model no? Which communication cable require  for FX-2NC-32MT PLC upload or download program? Thanks & Regards Sohel Ahmed
  16. Dear colleagues, Maybe someone faced with cylindrical grinding machine G32P-100NC model by Belor Co., Ltd or Supertec and have a set of programs for it? The program of A2N-20GM (FX2N-20GM) module has been lost. 
  17. Mitsubishi FX2N Battery Error

    I got through a mitsibishi FX2N PLC and when i turned it on it was giving battery error. So when i checked it with system and run diagnostic so i found the same error. By visual inspection i saw that there us no battery in it and someone has taken it out. So my question is that how we are going to reset the PLC when the battery was not intact for how long whixh we dont know. I have the copy of program with me to upload it to plc but the actual issue is battery error.
  18. Float Value FX2N Problem

    Dear All, I am facing a problem in FX2n, Infact i am making a totalizer from the flow. everything is fine. but client demands to add some totalizer value to start with totalizer.  the problem is that when i add 50000 value the value of registers stucks. although i am using 32bit float register along with DEADD command for Totalizer. the makes some steady at some place. i dont know why. but i give the totalizer 0 it works fine.  Any Solution regarding this will be help.    Value in the D72 = 0.0003
  19. Hi Guys I am currently configuring a profibus configuration using Gx Configurator DP. I need to 3 IO modules through a FX2N-32DP-IF. The modules I need to add are: FX2N-48ER(Intputs), FX2N-16EX and another FX2N-48ER(outputs). Do I need to download these modules GSD files and add them individually to the node?  If so, can you provide me with a link to these GSD files, as I am unable to find it?   Kind Regards Morne
  20. FX2n incorrect latch range

    Hello, I have an FX2N that got a corrupted program after the battery went flat. The PROG-E led is lit. I don't have a copy of the program, but I managed to read it from the PLC. Attached is the read program, it reports an incorrect latch range plus a bunch of errors. Any hints are appreciated. Thank you. Kind regards. backup_fx2n.zip
  21. Folks, we have a set of Mitsubishi Q12PRHCPU (redundant) running effortless since many years. CPU-A as standby and CPU-B as Control. Recently we noticed BATT low alarm on CPU-B. So we arranged for a spare battery Q6BAT and started the procedure as per manual(attached procedure and flow chart). We did memory copy from Control to standby (as prescribed precaution) and did the Reset of Standby PLC CPU-A. Memory copy from B to A completed successfully 100%. But the BACKUP LED did not turn Green from Red & Error LED kept flickering on standby CPU-A. CPU-B remain in Control but backup LED turned RED. From system monitoring we found that there is a Error 6000 (FILE DIFF.) observed in One of the .QPG (program 00-MDBUS.QPG). We tried to reset it but were not successful. We are surprised that why does the program differs when it was copied from CPU-B to CPU-A using the memory copy. Still we did the VERIFY and found no difference between the programs in CPU-A & CPU-B.  Can anyone explain the cause of this issue and the solution. Please note that the CPU-B is still in control and plant is running. Backup LED on both CPU are red which means (redundancy loss) and error LED on standby CPU-A is flickering RED. There is no error in the CPU-A (Control) -we checked this using the GX Developer. Also attached here are the image of the error and error help. Thanks in advance. Battery Replacement procedure.pdf Battery Replacement procedure-Flow Chart.pdf Error.pdf MELSEC QCPU ERROR CODE 6000 FILE DIFF.pdf
  22. Hi,   We have a company that is specialized in bandsaw machines, this is one of those machines: What we have done is hook up a wire encoder to the saw bow and the other end of the wire on the base of the machine. You can see a picture of it in the attachment. I have followed the manual of the FX2N-2AD module, the wire encoder requires the current input from 4-20mA, and I am getting a digital output, but this needs to be converted to show in millimeters on the HMI. Unfortunately I am only learning how to do this, and am not an expert in Mitsubishi PLCs (yet). Currently the only code we are using in PLC for reading the 2AD module is found in attachment. TLDR: Wire encoder giving a digital output, but now need code that can convert this value into mm.    
  23. FX2N-32MR Prog/CPU Error

    Hello. I first off I wanna say that I am completely new to PLCs and am trying to help fix my Uncles hydraulic die cutting machine that uses a Mitsubishi FX2n-32MR plc. It has CPU version 3.10 and ram memory and is giving him the error 6402. This machine was working perfectly fine up until a few days ago. I already know that the backup battery is toast. It was only reading 0.1 volts. I am trying to figure out if the plc is fixable, if this is a software or a hardware issue and if so, how to fix it and help save him $$$.  I have successfully communicated with the PLC using a usb to sc09 cable and have the following software installed: GXWorks 2, GXWorks3, GX Developer and MT Developer 2. I got the error 6402 from GX Developer. I have attached what I believe to be the Program that it has installed to the PLC, but all I did was save it after the program read it(it had an error while reading it) so I dont know if there is actually any data.  Any help or direction is greatly appreciated. I have attached 2 images as well. Not sure how helpful they may be. Default Program.rar
  24. Program lost after battery replace

    We think so we lost the program after a battery replace, because the program isn´t loaded on GOT. Is it possible restore it by the PLC?
  25. FX3U Stop Reading Channel Data

    Hello Everyone,  Need help with reading channel data of FX2N-4AD with FX3U Cpu. I have added all the logic and it works also. Problem is that, FROM function stop reading/fetching data from FX2N-4AD after some time i.e couple of hours and value just hang. Like 502 or something, untill you reset the whole PLC. What could be the problem. For the further info, -I have connected the FX2N-4AD on the right of fX3U-64M. -There are two extension blocks FX2N-16EX and FX2N-16EYR also added to the right of FX3U-64M -Order of mounting....FX3U-64M > FX2N-16EX > FX2N-16EYR > FX2N-4AD > FX2N-4AD   I have tried using the 2nd special module connected at the end, but It showed similar problem after few hours of running. THis shows that both Special blocks fx2n-4ad are okay. There is something wrong with PLC maybe? Please help