FM 451 positioning module Siemens

Область применения

The FM 451 three-channel positioning module handles the adjustment of mechanical axes in the case of rapid-traverse and creep-speed drives. The module is intended for the positioning of adjusting and setup axes, preferably with standard motors, controlled via contactors or frequency converters.

The module is used in:

• Packaging machines
• Lifting gear and conveying equipment
• Woodworking machinery
• Paper and printing machinery
• Rubber- and plastics-processing machines

Обзор

• Three-channel positioning module for rapid/slow-action drives
• 4 digital outputs per channel for motor control
• Displacement measurement incremental or synchronous-serial

Note

Displacement measuring systems and precut/preassembled cables for counting and positioning functions are available under SIMODRIVE Sensor or Motion Connect 500.

http://www.siemens.com/simatic-technology

Дизайн

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.

Функции

Positioning functionality

• Setup:
  Move the rapid-traverse or creep-speed axis into position at the touch of a button (jog mode).
• Absolute incremental feed:
  The axis is moved to an absolute target position. The numerical values are stored in a table on the FM 451.
• Relative incremental feed:
  The axis is moved through a set route.
• Reference point motion:
  For synchronization after the PLC has been turned in when using incremental position encoders.

Special functions

• Set actual value
• Set reference point
• Delete distance to go

Mode of operation

Preparatory steps for a positioning task:

• Coordination of mechanical system and electronics:
  Easily achieved by entering machine data.
• Specify target position(s) via the S7 CPU or configuration software
• Transfer the interface signals from the CPU to the FM 451 (start, stop)

The FM 451 handles the actual positioning:

• 4 digital outputs controlling the rapid-traverse, creep-speed, counterclockwise and clockwise functions are assigned to each channel.
• Creep speed or rapid-traverse/creep speed is specified depending on the distance to the target.
• After the cutoff point is reached, the module monitors the target approach. After the target area is reached, a signal is sent to the CPU.

Технические данные