A positioning controller with the FM 351 features the following essential components:

• FM 351:
  • For the positioning of two independent axes
• S7-300 CPU:
  • For sequence control
  • For starting and stopping positioning actions
• Programming device:
  • For programming the STEP 7 program
  • For parameterizing the FM 351 with STEP 7 using parameterization screen forms
  • For testing and startup
• Operator panel (optional):
  • For operator control and monitoring of the machine
  • For error diagnostics

The FM 351 and CPU are linked via technology blocks.