Basic Units 07 KT 97, 07 KT 96, 07 KT 95

· The lithium battery 07 LE 90 can be put into the battery compartment in order to – store and backup the user program in the RAM – store and backup data which is additionally contained in the RAM, e.g. the status of flags – backup the time and date (real-time clock) 

· RUN/STOP switch for starting and aborting the program execution 

· Extensive diagnosis functions – self-diagnosis of the basic unit – diagnosis of the CS31 system bus and the connected modules · Integrated Flash EPROM for storing program and data 

· Exchangeable SmartMedia Card 07 MC 90 for user data or for updating the operating system or PLC program 2.1.1.2 Project planning / start-up The following has to be observed for project planning and start-up: 

· Programming is performed with AC31 programming software, which can be run on commercially available IBM compatible PCs (see documentation of the programming system 907 AC 1131). 

· Online program modification A quick modification of the user program is possible without interrupting the operation (see programming system 907 AC 1131). 

· Possible operating modes – Stand-alone basic unit – Bus master basic unit – Slave basic unit 

· Backup of data areas, i.e. saving of data during power OFF/ON, is possible with an integrated battery and/or by storing them in the Flash EPROM.