EMERSON A6312 Processor card

In applications where both the master and the follower are controlled by the DMC-18x2 controller, it may be desired to synchronize the follower with the commanded position of the master, rather than the actual position. This eliminates the possibility of an oscillation on the master passing the oscillation on to the slave. For example, assume that a gantry is driven by two axes, X and Y, one on each side. This requires the gantry mode for strong coupling between the motors. The X-axis is the master and the Y-axis is the follower. To synchronize Y with the commanded position of X, use the instructions: GA, CX Specify the commanded position of X as master for Y.

Electronic Cam 

The electronic cam is a motion control mode which enables the periodic synchronization of several axes of motion. Up to 3 axes can be slaved to one master axis. The electronic cam is a more general type of electronic gearing which allows a table-based relationship between the axes. It allows synchronizing all the controller axes. To illustrate the procedure of setting the cam mode, consider the cam relationship for the slave axis Y, when the master is X. Such a graphic relationship is shown in Figure 6.4. Step 1. Selecting the master axis The first step in the electronic cam mode is to select the master axis.

For the given example

 since the master is x, we specify EAX Step 2. Specify the master cycle and the change in the slave axis (es). In the electronic cam mode, the position of the master is always expressed within one cycle. In this example, the position of x is always expressed in the range between 0 and 6000. Similarly, the slave position is also redefined such that it starts at zero and ends at 1500. At the end of a cycle when the master is 6000 and the slave is 1500, the positions of both x and y are redefined as zero. To specify the master cycle and the slave cycle change, we use the instruction EM.

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