The FM 455 has 16 separate closed-loop control channels. The controllers display the following features:

• Prefabricated controller structures for:
  • Fixed setpoint control,
  • Cascade control,
  • Ratio control,
  • 3-component control.
• Choice of modes:
  Automatic mode, manual mode, safety operation, follow-up mode and backup mode
• Sampling time (depending on the resolution of the analog inputs and the compensation input):
  • For 12 bit: 20 to 180 ms.
  • For 14 bit: 100 to 1700 ms (depending on the number of enabled analog inputs)
• 2 control algorithms:
  Self-optimizing temperature algorithm, PID algorithm
• User-friendly controller optimization:
  The self-optimization function for the temperature algorithm is stored on the module and can be automatically activated in the case of setpoint changes of more than 12 %. the PID control algorithm is optimized using the parameterization screen forms in the configuring package
• Backup mode:
  In the event of CPU failure or CPU Stop, the controller can continue to operate independently.
• Disturbance variable input:
  the analog inputs can be used for feedforward compensation in addition to actual value acquisition, if desired.

Temperature controller with integrated self-setting

The temperature controller with integrated self-setting is suitable for controlled systems where the entire process has approximately the same temperature when the setpoint is reached, as is the case in water bath controls, steam boiler controls or injection molding machines.

The procedure is unsuitable for controlled systems where the temperature in a significant portion of the process still varies significantly after the setpoint has been reached, as is the case in furnace controls where the air heats up and the temperature is measured. When the air temperature has reached the setpoint, the furnace and its contents can still be cold.

Parameterization

A configuring package is available for parameterizing the FM 455. This contains all the screen forms required for configuring, parameterization and startup.

Detailed online Help is available for all screen forms.

The parameterization screen forms are called up from STEP 7 following installation.