A positioning controller with the FM 451 features the following essential components:

• FM 451:
  • For positioning three independent axes
• S7-400 CPU:
  • For sequence control
  • For starting and stopping positioning actions
• Programming device:
  • For programming the STEP 7 program
  • For parameterizing the FM 451 with STEP 7 via parameterization screen forms
  • For testing and startup
• Operator panel:
  • For operator control and monitoring of the machine
  • For error diagnostics

The connection between the FM 451 and the CPU is established by means of technology blocks.