Configuration of an External Measurement Axis (Channels 13 to 16)

Introduction

An external measurement channel is used to return external position information to the module. Configuring an external measurement involves configuring a real axis or an imaginary axis in which only the position information is valid.

Configuration Screen

The configuration screen of an external measurement is as follows. There are 3 parameter entry zones: Scale factor, Modulo and Units as well as a field for choosing the address.

Address

This field allows you to define the source of the position information:

Virtual: the position is written by the project program in the output register %QDr.m.c.0,
1 to 8: the position is read on the auxiliary position input of the real axis defined in the choice of the Address field (1 to 8).

Scale Factor Zone Parameters

Description

Parameter	Description
Numerator	Scale factor numerator. This value is entered as a floating point.
Denominator	Scale factor denominator. This value is entered as a floating point.

Modulo Zone Parameters

Description

Parameter	Description
Active	In the case of an infinite axis, this check box is used to activate the modulo crossing authorization.
Max modulo	Upper modulo limit. This value is entered as a floating point.
Min. modulo	Lower modulo limit. This value is entered as a floating point.

Units Zone Parameters

Description

Parameters	Description
Position	Position unit: mm, mm, cm, m, in, ft, yd, mil, mrad, rad, deg, arcmin, turns, pulses.

Internal Unit

The internal unit is mm for the linear (metric) type, inch for the English linear type and turn for the angular type.

Choosing a unit in degrees means that for a scale factor of 1/1, an increment of 1 pulse of the encoder changes the position by 360 degrees. For a unit in cm and a scale factor of 1/1, an increment of 1 pulse of the encoder changes the position by 1/10 mm.