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User Manual Chapter 15

GFK-1742F Jan 2020

Using the Electronic CAM Feature 334

cyclical CAM, specifying “NONE” means the CAM will exit when it reaches either the

minimum or maximum master position of the profile.

The [master mode] is used to specify whether the master axis operates in Absolute or

Incremental mode. The master axis may be operated in absolute or incremental mode for

both Cyclic and Non-Cyclic CAMs. In Absolute mode, the master positions in the table

represent the absolute positions of the master axis. In Incremental mode, the slave axis

positions in the table are relative to the master axis position when the CAM instruction is

initiated.

The [Cyclic Exit Condition] is used to specify an exit condition for a Cyclic CAM profile. If the

CTL condition evaluates to TRUE, the CAM will exit at the end of the current cycle.

Bi-directional and Unidirectional CAMs can be defined by using the +Vlim and -Vlim master

axis velocity limit parameters. For Unidirectional operation, the appropriate velocity limit

must be set to zero for the direction in which motion is prohibited. For example, if motion

in the negative direction is prohibited, then –Vlim must be set to zero.

15.3.5 CAM-LOAD Command

The CAM-LOAD command is used to load the slave axis position into a parameter register.

A regular PMOVE command can then be used to move the slave axis to the loaded position.

The CAM-LOAD command uses the CAM profile name, actual master position and phase

(specified using the CAM-PHASE command) to determine the starting point for the slave

axis.

Syntax:

CAM-LOAD <”CAM profile name”>, <Parameter Number>, <master mode>

Parameter

Description

<”CAM Profile Name”>

Name of the CAM Profile from the CAM Library ( the profile must be

linked to the CAM Download block). This name is limited to a

maximum length of 20 characters (also, see Note 3 below). Note that

the quotes around the name are required.

Specifies the Parameter Number to load.

Master mode can be declared as ABS (absolute) or INCR (incremental);

this indicates how the master position data is interpreted in the slave

start position calculation.

In ABS mode the absolute master axis position is used to determine

the corresponding slave starting position value from the CAM table.

In INCR mode, the master value is assumed to be equal to the CAM-

Phase in the calculations.

Emerson DSM314 User Manual

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