Nokta Industrial
 Automation Systems

CPU 224 XP/CPU 224 XPsi
  • Extensive instruction set:
    A large number of
    • Basic operations such as binary logic operations, result allocation, save, count, create times, load, transfer, compare, shift, rotate, create complement, call subprogram (with local variables)
    • Integrated communication instructions (e.g., S7-200 communication (Network read NETR, Network write NETW) or Freeport (Transmit XMT, Receive RCV))
    • User-friendly functions such as pulse-duration modulation, pulse sequence function, arithmetic functions, floating-point arithmetic, PID closed-loop control, jump functions, loop functions and code conversions simplify programming
  • Counting:
    User-friendly counting functions in conjunction with the integrated counters and special commands for high-speed counters open up new application areas for the user
  • Interrupt handling:
    • Edge-triggered interrupts (activated by rising or falling edges of process signals on interrupt inputs) support a rapid response to process events
    • Time-controlled interrupts can be set at 1 ms increments from 1 ms to 255 ms
    • Counter interrupts can be triggered when a setpoint is reached or when the direction of counting changes
    • Communication interrupts make exchanging information with peripheral devices such as printers or bar code readers quick and easy
  • Direct interrogation and control of inputs/outputs:
    Inputs and outputs can also be scanned and set directly independent of the cycle. The controller is then able to respond quickly to process events (e.g., direct resetting of outputs on the occurrence of an interrupt).
  • Password protection:
    The 3-level password protection concept effectively safeguards your know-how. The protection concept has the following options for access to the user program:
    • Full access: the program can be altered as desired.
    • Read-only: the program is protected against unauthorized changes. Testing, setting system parameters and copying the program are possible.
    • Complete protection: the program is protected against modification and unauthorized readout and copying. Parameter settings are supported.
  • Test and diagnostic functions:
    User-friendly functions support testing and diagnostics: The entire program is executed and analyzed using a definable number of cycles. Internal parameters such as bit memories, timers or counters, are logged in a max. of 124 cycles.
  • "Forcing” of inputs and outputs during test and diagnostic operation:
    Inputs and outputs can be set independently of cycle and thus permanently, for example, to test the user program.
  • Runtime edit:
    In RUN mode, programs can be edited and modified programs can be loaded into the CPU at the click of a mouse, without having to interrupt the current program.
  • Additional mathematical modules such as SIN, COS, TAN, LN, EXP
  • Data logging:
    Time-controlled or event-controlled saving of data records on the EEPROM memory submodule, e.g. performance data, statistical data, fault/error messages, optionally with a time tag. The log file can be transferred at any time using the S7 Explorer in STEP 7-Micro/WIN.
  • Recipe management:
    Recipes are defined and downloaded within the STEP 7-Micro/WIN project. For better memory utilization, the recipes are stored in the EEPROM memory submodule. The recipes can be modified and updated online.

The STEP 7-Micro/WIN32 V4 programming package permits complete programming of all S7-200 CPUs.


The CPU 224 cannot be programmed using STEP 7-Micro/DOS. If programming is to take place via the serial interface of the PG/PC, the PC/PPI cable is required additionally. If the STEP 7 Micro/Win V4 programming software is used, programming can take place via the SIMATIC CP 5511 or CP 5611 (see SIMATIC NET) as well as via the MPI interface of the programming device. This increases the maximum permissible transmission rate to 187.5 kbps.

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