Programmable Position Limits The DMC-18x2 provides programmable forward and reverse position limits. These are set by the BL (Backwards Limit) and FL (Forward Limit) software commands. Once a position limit is specified, the DMC-18x2 will not accept position commands beyond the limit. Motion beyond the limit is also prevented. Execution of the above example will cause the motor to slew at the given jog speed until the forward position limit is reached. Motion will stop once the limit is hit.
Off-On-Error
The DMC-18x2 controller has a built in function which can turn off the motors under certain error conditions. This function is know as ‘Off-On-Error”. To activate the OE function for each axis, specify 1 for X,Y,Z, and W axes. To disable this function, specify 0 for the axes. When the function is enabled, the corresponding motor will be disabled under the following 3 conditions: 1. The position error for the specified axis exceeds the limit set with the command, ER 2. The abort command is given 3. The abort input is activated with a low signal. Note: If the motors are disabled while they are moving, they may ‘coast’ to a stop because they are no longer under servo control. To re-enable the system, use the Servo Here (SH) command. The SH command will clear any position error and reset the commanded position to the actual position.
Automatic Error Routine
The #POSERR label causes the statements following to be automatically executed if the error on any axis exceeds the error limit specified by ER. The error routine should be closed with the RE command. RE will cause the main program to be resumed where left off. NOTE: The Error Subroutine will be entered again unless the error condition is gone.
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