The x currently is 0 to 5, but that could change to more numbers. Ordering the part that has '40' in the part number gives you the CPU that has firmware V4.x. You will notice that each CPU type has 3 part numbers. The scope of application ranges from replacement of relays and contactors, conveying systems, pump control, and energy management through to distributed tasks in a more complex automation network. The S7-1200 with firmware V3.0 can still be programmed with Step7 V17. Compact, modular Simatic S7-1200 controllers are used for open-loop and closed-loop control tasks in mechanical and plant engineering. As with the other CPUs, the basic unit is available in three versions: dc/dc/dc, ac/dc/relay, and dc/dc/relay. The new Simatic S7-1215C CPU offers the user 14 digital inputs, 10 digital outputs, two analog inputs, and two analog outputs. Processing speed has also been increased: for example the Boolean execution time is 0.085 microseconds per operation. The new CPU also has a second Profinet interface, two analog outputs as well as fast outputs for controlling up to four stepper motors. At 100 kilobytes, the user memory has twice to four times the capacity of existing devices. The Siemens Industry Automation Division has extended the top end of its Simatic S7-1200 controllers portfolio with the addition of the Simatic S7-1215C.
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