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ABC X-CPU-2 m57 - the modular CPU solution for the Simatic S5-Racks



The ABC X-CPU-2 m57 is a central module for use in the automation systems of the SIMATIC S5 by Siemens. The module is programmable in STEP5, STEP7, PCS7 and TIA by Siemens and is suitable for restructuring and upgrading projects.

Integrated is the multiprocessor operation with up to three S5 CPUs and one S7 CPU.

In addition the m57 offers an expanded operating functionality for asynchronous handling of fast processes.

4 Gigabit CPs, 3 fieldbus masters and the unique opportunity to work with S5 and S7 programs simultaneously, give the subject of retrofit SIMATIC S5 systems a new dimension.

  • Intel Atom Processor N450 1.66 GHz, 512 KB L2 Cache
  • 4x integrated 10/100/1000 Mbps Ethernet interfaces
  • 2GB memory on board
  • 64 MB remanent data
  • Built-in socket for SD cards
  • 3 serial interfaces (1x TTY, 2x RS232)
  • LED diagnostics display
  • For use in SIMATIC racks of 115U, 135/155U and 150U/S/K by Siemens
  • Command compliant to S7-CPU 416 also in Mixed Mode as 416-945/948
  • Quantity structure/Performance equates to S7-CPU417
  • Compatible to S5-CPU 945/948
  • Supports multiprocessor communication with up to 3x S5-CPU948 and 1x S7-CPU416
  • Programmable in STEP5, STEP7, PCS7 and TIA
  • Complete TCP/IP connection for linking of homogeneous and heterogenous system components integrated
  • High Performance (average 10ns/operation)
  • One up to three fieldbus master Profibus, Profinet, EtherCAT


Technical data hardware​ ​


Intel® Atom TM Processor N450

electrical data​

+5Vdc: 4.85V...5.24V

operating conditions

operating temperature

storage temperature

relative humidity

vibrations and shock resistance



0°C ... +60°C

-40°C ... +85°C

during operations: max. 90% without condensation

2g/10..500Hz, 20g/10ms

acc. IEC1000-4-2 (ESD)

acc. IEC1000-4-4 (burst)

emissions acc. EN55022, Part B​


4 LEDs as status and fault indicators


double eurocard, height 8 HU​





1x AS 511 (TTY) with DSUB 15

2x RS232 with DSUB 9

4x 10/100/1000 Mbps.

memory extension​

2 GB DDR2-667 MHz

8 GB SD Memory Card

64 MB remanent

technical data software RS5:

processing times

bit operations

word operation​s

fixed point arithmetics

floating-point arithmetics

10 ns

10 ns

 10 ns

10 ns


technical data software RS7​:

processing times​

bit operations

word operations

fixed point arithmetics

floating-point arithmetic​s

10 ns

10 ns

10 ns

10 ns


S7 timers 2048​

S7 counters 2048​

data range and remanence


process image



FBs max.

FCs max.

data blocks max.


Load memory

Work memory

Communication jobs


16 KByte from MB 0 to MB 16383

16 KByte in/16 KByte out

from EB 0 to EB 16383/AB 0 to AB 16383

max. 64 Kbyte




9 wake up alarms

20 Mbyte

16 Mbyte



order numbers and prices:


The ABC X-CPU-2 m57 will be replaced by the ABC X-CPU-6 m57. Order numbers and prices of the ABC X-CPU-6 m57 can you see here.

Step and Simatic are registered trademarks of Siemens AG.

Profibus, Profinet, EtherCat are registered trademarks of their respective companies.