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  1. 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? 
  2. 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?
  3. 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.
  4. 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!