Controlling With The Fm - Siemens SIMATIC S7-400 Configuration And Use Manual

4.7

Controlling with the FM 455

Introduction
The FM 455 is a universal controller module. The FM 455C is a continuous
controller for controlling analog actuators and the FM 455S is a step controller for
controlling motor-driven actuators. The FM 455 provides the following features to
relieve the load on the CPU:
• Temperature controller (fuzzy controller)
• PID controller
Functions of the FM 455
The FM 455 provides you with the following functions:
• Fixed setpoint control
• Follow-up control
• Three-component control
• Cascade control
• Ratio control
• Blending control
• Split-range control
Automation System S7-400 Configuration and Use
A5E00442711-02
Technological Functions of the S7-400
4-9