S
I'm looking for a inexpensive alternative to hot backup of Siemens PLC and somebody suggegst me to look for software redundancy. However, I'm also told that software redundancy is a lower grade solution for redundant PLC and the switchover time could be longer than 1.5 second!! Also there is a lot of software programming work to do just to take care of the transferring of data between the redundant PLCs. Can anybody that has experience with this system tell me what is it all about?