SIEMENS SIMADYN D control system

SIMADYN D is a well-proven subrack-based system (Rack Based), with a modular hardware and software design. This means that it can be configured for any type of application.

SIMADYN D distinguishes itself due to the various packaging types with subracks which are suitable for small extending up to high requirements. Not only this, but also the matching modules for closed-loop control, input/output and communications.

The subracks with up to 24 slots have two high-performance 16-bit backplane buses for fast data transfer between the individual modules.

CPU modules

For SIMADYN D, general open-loop and closed-loop control tasks are executed on high-performance 32 and 64-bit CPU modules with RISC processors.

Both CPU modules offer a slot for Flash program memory modules MS5, MS51, MS52 (supplementary components)

Buffer memory modules
  • The buffer memory modules provide a memory via which several CPU modules can exchange data with one another.

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In addition to user-friendly engineering using graphic program techniques, users have all of the advantages of a system which has proven itself admirably in the widest range of applications, and that for over a decade now.

Graphic engineering

For many years now, using SIMADYN D, control concepts have been developed, implemented and tested on the target system with the graphic STEP 7, and CFC engineering tools and, as an option, SFC – and that directly on the screen. These advantages have a positive impact in all of the phases of a project:

  • Standard tools for engineering/configuring, testing, commissioning, service and maintenance as well as when making changes and expanding the functionality
  • Configuring instead of programming: Suitable function blocks, e.g. for closed-loop control, arithmetic operations, input/output, communication or diagnostic tasks, are selected from a library and are located as graphic symbol directly on the “worksheet” on the screen. These function blocks are then interconnected using the mouse or are parameterized. A high-performance auto router immediately visualizes the signal flow which has been entered
  • Complex tasks can be broken-down into transparent sub-tasks. This supports structured work and makes it easier to understand and even allows older concepts to be comprehended.
  • An authentic print-out can be created from the configured hardware and software at the “press of a button”.


CPU modules

A SIMADYN D system always contains one or several CPU modules. The configured user program (e.g. user software) run on these CPU modules. For extremely complex, sophisticated tasks, or if many functions have to be processed in extremely short cycle times, then several CPU modules are used. There are various types of CPU modules with the following features:

  • State-of-the art, high-performance 32-bit technology (PM5, PM6) permits cycle times for typical control loops of approximately 0.5 ms.
  • PM5 for standard applications and PM6 for applications requiring a high performance

Up to 8 CPU modules can be operated in a subrack.

Program memory modules

A program, generated on a PC, is downloaded into a program memory module (MS..). This memory module is then inserted in the CPU module. The memory modules also have a non-volatile memory for permanently saving online changes.

Buffer memory

If more than one CPU module is operated in a subrack, a buffer memory module MM.. must be inserted between the CPUs to implement data exchange.

Input/output modules

Analog, digital and incremental encoder signals are connected to input/output expansion modules IT41/IT42 as well as via the SITOR converter module ITDC.

Every CPU module can be ex­panded by a max. of 2 IT.. modules.

The EA12 and EB11 input/output modules also provide additional connections for analog, digital and incremental encoder signals.

Communication modules

High-performance serial couplings are implemented (PROFIBUS DP, Industrial Ethernet, fiber-optic cable subrack coupling) using the communication modules (CS..) and the communication sub-modules which can be inserted on them.

It is important to especially mention the CS7 carrier module. Up to three communication modules, type SS4 (for DUST/USS protocols) or SS52 (for PROFIBUS DP) can be plugged-onto the CS7.

A SIMOLINK® master interface ITSL is directly plugged onto one of the CPU modules.

Interface modules

As a result of the high quantity of signals, the plant and process signals, for example, analog, digital and incremental encoder signals, are acquired through interface modules.

The interface modules (SA.., SE.., SU..) are snapped onto mounting rails in the cabinet and are connected to the modules through pre-assembled, plug-in cables (SC..).

Using these interface modules, analog signals can be electrically isolated and adapted.

Digital signals are displayed on LEDs and can be electrically isolated.

Operator panels

SIMATIC operator panels are connected to MPI through the CS7 communications module and the SS52 communications module. Several operator panels can be operated on the MPI bus.

The user programs the function and display of the operator panels using the ProTool/ Lite SIMATIC tool. This means, for example, that several process quantities can be monitored and changed.

Commands can be entered, the SIMADYN D clock time can be set and displayed using function keys.

Operating and fault messages can be defined in the OP using the user data areas.


Serial coupling to PROFIBUS DP, SIMOLINK or Industrial Ethernet is established with communication modules. Plug-in communication submodules are inserted on the main communication modules.

As a result of the high number of signals, the plant and process signals, for example analog, digital and incremental encoder signals are not directly connected to the modules but rather to interface modules and plug-in termiinals.


Control-related applications are quickly and simply created using CFC function blocks.

Technical specifications





32-bit RISC with FPU

64-bit RISC with FPU

Program memory (PC card)

2, 4 MB Flash

2, 4, 8 MB Flash

Work memory



Cache (program/data)

16/4 KB

16 KB each

Permanent modification memory



64 KB SRAM, battery-backed

256 KB SRAM, battery-backed

Sampling time

  • Shortest

100 µs

100 µs

  • Typical

0.8 ms

0.5 ms

Typical computing times (REAL)

  • MUL, multiplier

5.5 µs

1.8 µs

  • PIC, PI controller

14.3 µs

4.7 µs

  • RGE, ramp generator

29.5 µs

9.9 µs




Industrial Ethernet

Industrial Ethernet