Update SYMAX 400 to Allen-Bradley


Thread Starter

Antonio Fernandez

Customer with an obsolete SYmax has lost communication and not able to recover logic nor even to restart the system.

Additionally, customer has lost communication with processor and its facility is currently stopped. Need to update to a new system, but logic must be recovered since it has not be documented.
You need to put a voltmeter on the backup battery without disconnecting it from the 400. If its reading less than 2.5 Volts there is probably no program to save. Backup batteries are either 3.0v or 3.6 volts in most systems. Most RAM chips need to have at least 2.5 volts them to maintain the program.

Good luck..