ladder logic sequence - PLCS.net

jimcav · January 26th, 2007, 10:17 AM

Hey Guys

I am using a allen bradley 1500 connected to emerson servo drives, before i sit down and reinvent the wheel does any one have an example of what the did to sequence moves. The thing that drives me nuts is there end of index bit always stays on after the index is done and wont go off till i start that index again.

thanks
jim cav

dalem · January 26th, 2007, 01:10 PM

I don't have any examples, but the following may save you from going completely nuts.

Use an ONS or OSR in the rung of your program, so that the PLC only sees (or uses) that end of index signal once. The program will then ignore it until after the next index start. (True to false then true again.)

January 26th, 2007, 10:17 AM	#1
jimcav Member Join Date: Dec 2004 Location: new jersey Posts: 168	ladder logic sequence Hey Guys I am using a allen bradley 1500 connected to emerson servo drives, before i sit down and reinvent the wheel does any one have an example of what the did to sequence moves. The thing that drives me nuts is there end of index bit always stays on after the index is done and wont go off till i start that index again. thanks jim cav

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January 26th, 2007, 01:10 PM	#2
dalem Member Join Date: Sep 2005 Location: NE Wisconsin Posts: 101	I don't have any examples, but the following may save you from going completely nuts. Use an ONS or OSR in the rung of your program, so that the PLC only sees (or uses) that end of index signal once. The program will then ignore it until after the next index start. (True to false then true again.)

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