It seems that Triconex TMR PLCs will lose the values of internal variables not only if power is cycled, but also if the CPU is stopped. The 16MB of the 3008 CPU is not battery backed, only the 6MB of Flash memory. Granted, TMR CPUs, redundant power supplies, etc. the probability is low. The real concern is losing arrays of data developed during operation if the CPU is stopped and restarted. We have a constraint where we can't have a connection to a PC to act as a server to reload the arrays like might be obvious. Anyone have Triconex experience and would like to lend 2 cents? Thanks.