Technological Functions of the S7-400
4-6
Automation System S7-400 Configuration and Use
A5E0044271 1-02
4.4 Controlled Positioning with the FM 451
Introduction
The FM 451 positioning module is used to set and position mechanical axes with
the rapid/creep method. It provides the following features to relieve the load on the
CPU:
• Monitoring of standstill and target approach
• Setting of actual value / actual value on-the-fly
• Zero offset
• Setting of reference point
• Deleting of distance remaining
Functions of the FM 451
The FM 451 provides you with the following functions:
• Configuration in inching mode
• Absolute/relative incremental approach
• Reference point approach
• Loop traverse
Performance characteristics of the FM 451
The FM 451 has the following performance characteristics:
• Number of axes:
-- 3 linear or rotary axis
• Inputs and outputs
-- 4 digital inputs per axis
-- 4 digital outputs per axis
• Typical drives
-- Standard motor , contactor controlled
-- Standard motor with frequency converter , e.g. Micromaster
-- Asynchronous motor connected to power unit with vector control
• Connectable encoders:
-- Incremental encoder 5 V differential signal, symmetrical
-- Incremental encoder with 24 V signal, asymmetrical
-- SSI absolute encoder
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