Siemens SIMATIC MV440 Operating Instructions Manual page 298

Process interfacing via an automation system (PLC, PC)
10.5 Controlling the I/O interface "DI/DO"
Select program
To select a program, apply the relevant bit pattern at the inputs SEL0 to SEL3. You can
select programs 1 to 15. If you select program 0, the program last selected will be retained.
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SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06