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Programming

Rotary Table with “Calibrated” Stop Positions

Home the axis, wait for an input and then index to 3 different stop positions (absolute positions),

wait for an input between indexes. The InPosn output function could be assigned to an output

to indicate when the axis has completed the index and the following error is less than a specified

amount. Since the indexes are to absolute positions they can be adjusted to “calibrate” the stop

positions to account for mechanical non-linearity in the particular rotary table. A rollover

position of 360.00 degrees would be entered into the setup screen so that the system would take

the shortest path (across the rollover) during the last move.

Home.0.Initiate ‘Sensor,Offset=0.0deg/s,Vel=-1000deg/s

Do While (TRUE) ‘Repeat until the program is halted

Wait For ModuleInput.1=ON ‘ModuleInput.1 is the “Go” input

Index.2.Initiate ‘Absolute,Posn=120.07deg,Vel=1000deg/s

Wait For InPosn

Wait For ModuleInput.1=ON

Index.3.Initiate ‘Absolute,Posn=239.95deg,Vel=1000deg/s

Wait For InPosn

Wait For ModuleInput.1=ON

Index.1.Initiate ‘Absolute,Posn=0.03deg,Vel=1000deg/s

Wait For InPosn

Loop

Flying Cutoff/Shear

Flying cutoff or flying shear application to perform synchronized out and return indexes which

repeat every 100 inches of master travel.

Part Length = 100 inches

Knife Travel Distance = 20 inches

PLS.0 is used to initiate Index.0 every 100 inches. PLS.0 has an “ON” point at 0.000 inches

and an “OFF” point at 90.000 inches. PLS.0 has a rollover position of 100.000 inches. The

rollover position is used to set the part length. The source for PLS.0 is the master axis. The PLS

is configured in the PLS setup screen. The PLS output does not necessarily need to be

connected to an output line on the drive or module because it is used within the program to

initiate an index.

An Index PLS is used to fire the cutoff knife. The Index PLS is connected to Output #1 on the

drive. The Index PLS is configured in the index setup screen. The Index PLS for Index.1 has

an “ON” point 2.000 inches into the index and an “OFF” point 18 inches into the index.

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Emerson FM-3 Installationshandbuch Seite 107