Linear mover with sensors

Linear Mover with Integrated Sensors

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You need these elements to set your machine in motion. In reality they correspond to all those components that are just carrying out a straight movement. These might be hydraulic/pneumatic cylinder, rack and pinion drives, piezo-electrical actuators, wagons running on rails and all kinds of things like this.

In TrySim, a linear mover is a line that can be located anywhere in space along which the movement is executed. If the desired movement does not follow a straight line, you either have to interlink two ore more linear movers or, if this is not possible, use a joint, the free point, or the chain.

The linear mover has a marked spot, which is called hot spot. This spot can be moved along the linear mover, however not beyond its limits.

In order to fix other elements to the hot spot, you have to define the linear mover as their father. All these elements will then move just like the hot spot.

The speed or the position of the hot spot is preset by the drive. So the drive corresponds to a motor, a valve or a control electronic. To select the drive you have to click it within the edit mask from the list ‘drive type’. By the button ‘drive’ you call up the edit mask of the drive.

These are the possible drives of the linear mover.

On the edit mask the position of the hot spot is shown as a number or by a slide controller. During the construction time the position can be changed in order to adjust limit switches and things alike.

There is also a linear mover with integrated sensors and position indicator.

To change the orientation of the linear mover with the mouse you have to point with the mouse cursor on one end of it and wait until the mouse cursor changes to a cross.

You can also use a linear mover to control a joint, a valve or a heating.

The linear mover is equipped with integrated limit switches and a position detection. You can configure the sensors in the tabsheets 'limit switch' and 'position' at the edit mask of the linear mover.

The procedure to synchronize the position detection is as follows:

1.) Move the hot spot to a position where you know the value that the position detection should display. To do that you can move among other things the slide controller ‘hot spot’ on the linear mover form.

2.) Open the mask of the detection with the tabsheet 'position'. You can either enter the offset as way or put the current desired donor value into the field ‘display’.

Please note the difference between this position detection and the one that is done by the spy: If you use linear movers which work oblique in space, the output will be the distance along the linear mover, whereas the spy will provide three spatial coordinates separately.

The integrated limit switches will only work if the hot spot of the linear mover is absolutely at the stop. If the hot spot does not stop there (this will often happen if the linear mover is moved by a joint) this will lead to errors. In such cases you should use a normal linear mover and normal limit switches. You can adjust these so that they respond in every case.

The position determination provides the value as DINT. We did so because the value range of the INTs (-32000 to + 32000) is not enough in many cases. If you need just one INT in the program you just have to load the last two bytes of the DINT. Example: You state ED 1200 for the Sensor. This ED consists of the bytes 1200, 1201, 1202 and 1203. If need just one INT, because your positions are guaranteed smaller than 32.000 units, write in the PLC program: L EW 1202.

Please note that the bytes 1200 and 1201 may no longer be used, since the position determination will write on them in every simulation cycle.

Apropos of nothing: It is wise always to use DINTs. Modern PLCs contain storage space without end and you hardly ever have to consider wether the value range is big enough.

Please read the help to the resolver for conveyor