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  1. 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
  2. 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?
  3. FX2N Battery replacement

    I have run across a Mitsubishi FX2N with a battery light on.  I have never worked with Mitsubishi before, but the manual describes changing the battery and indicates the controller must be powered down for the change.  You have to beat the clock and change the battery within 20 seconds.  Has anyone changed these batteries while powered?  Used to do that with PLC5's but I have never dealt with this processor before. 
  4. I want some recommendations for a PLC that can hold its memory for long periods of time with no power. I have a customer that has the molds that only get used a couple of times a year and when they are not being used they sit in storage until they need them again. Currently they have a DirectLogic05 controller and what they have noticed is that when they pull these molds out of storage to use them, the program is lost and they got to download it again. They want to make it to were all they gotta do is plug and play basically for this machine. Is there a special module or a processor that can hold its program for long periods of time while it has no power on it? 
  5. Difference between 1747L552B/C and L552

    Hello, i would to know if there is differences to replace a 1747-L552B/C CPU with a 1747-L552. We have some problems to find in Europe a exactly type of this cpu (it's also much expensive), but there are avaible many  L552 code. Best regards, Ennio
  6. Second day using Proficy. Needing to cookie cut from a template program that references I/O devices in the HMI variables. Currently I have to edit each one individually, and there are thousands of tags to be changed, times the number of cloned systems I am creating. How can I automate this mind numbing, and error prone work?
  7. Q50UDEHCPU battery info

    Does anyone know if the Q50UDEHCPU is supplied with a battery for saving the RAM memory in case of power down? Also i read that you can put a second battery to back-up the memory stored in the Memory Card in case of power down. Is this also supplied by Mitsubishi or does it need to be ordered separately?
  8. Dear All, I am a new on this forum and this is my fist post. I am using Mitsubishi Melsec A cpu (A1SJH) which is now communicat with GOT GT1155-QTBDA. Right now plc base rack right side last port is using for HMI communication. I want to replace only GOT with any other brand. Can any one suggest which make HMI can support with A1SJH CPU. Thanks in Advance
  9. Hello! I saw there were some people on this forum who works with theese old PLC:s so i try here: Run onto this ancient Omron PLC - C20-CPU84E. Someone has not maintaned the battery enough.. and someone has not upgraded the machine. Stupidity. Now they want it running in three days. About 100+ I/O so its interesting to kick the old horse once more. I took the CPU off-site for investigation. I do not have the programming console etc but I am able to hire equipment from Omron if needed. PLC is said to have PROM. CPU is set to RAM ( dip-switches ). "PROM" Circuit has no programming window. It does not look like Omron EPROM images found on google. PROM chip has marking "Omron BP0J". * Application does not seem to need timers. Battry dead. LEDs: POWER ON RUN OFF ALARM OFF ERROR ON For testing - I charged the battery to 3.3+ V ( later resoldered the connector to a fresh CJ1W-BAT01, also gives 3.3V ) LEDs: POWER OFF RUN ON ALARM OFF ERROR ON Manual says it wants the battery alarm reset using programming terminal. Question: Run is lit: does it actually run? Or is it - it tried to run?. I tried manipulating some inputs and suspect the later. If it run - I could travel on-site and see how the machine behaves. If not - i have to get theprogramming terminal first. Thank you for any input.
  10. Hi there I have a panelview in plant and when I try to buy, it tells me this obsolete, someone will know what is the recommended replacement for this equipment Rockwell, part number is 27711P-T7C4D1 or when i can found this number replacement part thanks a lot guys for the help Angel Leiva Project Manager Ingenieria Autintrol CA 584242608153
  11. I have several Mitsubishi Melsec Fx-1n 60 plc's that sometimes go for weeks without the equipment getting powered up when not in use. I know that it has the eeprom memory- does anyone know of a cheap effective hack to attach a battery or other device to the plc to retain the memory? I thought of attaching a battery backup unit from staples to it-any thoughts? The program operates ink pad printers which has several "jobs" in memory- (with parameter settings) it loses. This is leading to excessive set-up time when production is required. Any help is greatly appreciated!