The FM 352 electronic cam controller is a 1-channel module for solving position- or time-dependent tasks.
They are far superior to mechanical cam controllers, particularly thanks to their high level of flexibility.

The FM 353 is a positioning module for controlling stepper motors. It can perform many functions for solving a wide variety of positioning tasks, and offers a high level of precision, dynamic response, and user-friendliness.
In contrast to modules which control servomotors, the FM 353 requires no position decoding system

It can be used in all low-load positioning tasks and where there are no major load fluctuations. When these prerequisites are fulfilled, virtually the same degree of accuracy can be achieved with the FM 353 and stepper motors (µm-range) as with servomotors.  

The FM 353 is used in the SIMATIC S7-300, C7 and ET 200M on S7 masters. Operation with WinAC Slot 41x is possible.

Ultra-high-speed binary logic operations and the fastest possible path-dependent switching operations combined with exceptionally little jitter - Those are the strengths of the SIMATIC FM 352-5 application module.
With a cycle time of only 1 µs, it is clearly superior to any conventional PLC CPU.
Whether you want to increase the machine cycles, produce products of the highest quality, or prevent machine or tool damage - the FM 352-5 is exactly the right choice.

The FM 354 is a positioning module for position control with servomotors. It is suitable for precise position control in the face of load fluctuations or high dynamic response.
The FM 354 can be used for simple point-to-point positioning as well as for complex velocity profiles with the very highest demands on dynamic response, precision and speed, and is thus the ideal solution for positioning tasks with high clock-pulse rates both in mini controls and in distributed configurations directly on the machine.   
The FM 354 is used in the SIMATIC S7-300, C7 and ET 200M on S7 masters as well as with WinAC Slot41x.