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.
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.
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.
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.
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.
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.