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S7-400 CPU 41x -- Product information -- Background and system information
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Which SIMATIC S7-300/S7-400 modules support the NTP time-of-day message and how do you activate this kind of time synchronization?
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Which types of connection/protocols do the S7-300/400 CPUs and the CPs support by default?
Which PROFINET nodes support automatic commissioning (device replacement without interchangeable medium) in the case of topological configuration and device replacement without topological configuration?
Behavior of the CPU after power off without back-up battery
I/O addressing with DP slaves
Which PROFINET nodes support the extended PN diagnostics and what do you have to configure?
What is the difference between a restart (warm restart), cold restart and hot restart of a S7-400 CPU?
Which SIMATIC S7 modules support the "Direct Data Exchange" function (internode communication)?
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Which entries deal with consistent data in conjunction with distributed I/O?
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Which modules support the S7 routing function?
CPU does not work in RUN
What does "Correction factor" mean in the "Diagnostics/Clock" tab of the CPU's Properties dialog?
What is multicomputing mode and what are the differences to operating in the segmented subrack?
Differing information on the requirement of offline/ online memory
How can I get an overview of the S7-400 memory concept?
What is multicomputing mode and what are the differences to operating in the segmented subrack?
Part number:


The properties and advantages of multicomputing:

  • Common K bus and common P bus in non-segmented module racks (central controllers) URL and URL.
  • All CPUs work on one common I/O and communication bus, with automatic synchronization of the operating state transitions.
  • A complex overall task can be split over up to 4 CPUs.
  • Scalable performance increase is possible by simple slotting another CPU.
  • Increase of system resources (memory, flags, counters, ...).
  • Option of separating time-critical process part from non-time-critical process parts (e.g. rapid control of a fast closed-loop controller).
  • Every I/O module is assigned to one specific CPU.
  • Multicomputing is supported by S7-400 CPUs with the following order numbers:
Module Order number: Order number: previous / discontinued
CPU 412-1 6ES7412-1XJ05-0AB0 6ES7412-1XF01-0AB0
CPU 412-2 6ES7412-2XJ05-0AB0 6ES7412-2XG00-0AB0
CPU 414-2 6ES7414-2XK05-0AB0 6ES7414-2XG01-0AB0
CPU 414-3 6ES7414-3XM05-0AB0 6ES7414-3XJ00-0AB0
CPU 414-3 PN/DP 6ES7414-3EM05-0AB0  
CPU 416-2 6ES7416-2XN05-0AB0 6ES7416-2XK00-0AB0
CPU 416F-2 6ES7416-2FN05-0AB0 6ES7416-2FK04-0AB0
CPU 416-3 6ES7416-3XR05-0AB0 6ES7416-3XL00-0AB0
CPU 416-3 PN/DP 6ES7 416-3ER05-0AB0  
CPU 416F-3 PN/DP 6ES7 416-3FR05-0AB0  
CPU 417-4 6ES7417-4XT05-0AB0 6ES7417-4XL00-0AB0
Table 1: Modules that support multicomputing

Operation in the segmented module rack CR2

  • The CPUs in the segmented module rack are each an independent subsystem and behave each like a separate processor, i.e. there is no multicomputing.
  • The segmented module rack contains two separate P bus segments with 10 slots in Segment 1 and 8 slots in Segment 2.
  • For each I/O bus segment one CPU is implemented, to which the I/O modules are assigned locally. The CPUs work independently of each other without synchronization of the operating state transitions.
  • The common communication bus enables communication of subunits without additional hardware.
  • Two separate controllers can thus be realized in one CR (space saving in the switchgear cabinet).
  • Cost saved, because only one module rack and one power supply are required.

More information on this topics is available in

  • Entry ID: 1117849 "SIMATIC S7-400 Programmable Controllers Hardware and Installation (installation manual)", section 2.3.
  • Entry ID: 23904550 "SIMATIC Automation System S7-400 CPU Specifications", section 3.1.

 Entry ID:42650   Date:2008-04-21 
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