johnny61

hi, thanks for the guide.I just manage to get it works thanks to TWControls.

I have draw 2 ladder diagram based on the question.I think there are some mistake in it ladder diagram and may be I miss some part. Can someone please give some comment and advice.thanks. question.pdf Q2C.doc Q3C.doc Q2c_update.doc Q3cupdate.doc

thanks for all the guide,advice and spending the time for helping me.

my lecturer just told me that I can use the B3 function for my ladder diagram.I am very sorry that I is my mistake for causing the problem.How abou the Q3©ladder diagram?I have problem with the timer relay part.

Since I am using the trial version of the PLC software so I can not use the XIO function.I will temporarily replace it with normally close relay. 2QC.doc

hopefully this is correct.I still need to use the NEQ fuction ? 2QC.doc

is the the way? 2QC.doc

Here is the new ladder diagram.So now I have to replace the output for Y0,Y1 and Y2 with the OTL and OTU? 2QC.doc

can you please guide me on using the b3 function,I would like to know how to use it. From what I found out that in plc: "Individual data bits can be accessed in the bit memory. These can be very useful when keeping track of internal states that do not directly relate to an output or input. The bit memory can be accessed with individual bits or with integer words" What I don't understand is how can I use the bit function it in application?Do I have to use instruction such as 'BSR' 'NEQ' such as the one used in the 'tank program' 'OSR' in order to use the bit function.

thanks for the Q2c guide.I would like to know about the the Q3c ladder diagram which is about the automatic door control system.

how about the q3c ladder diagram?The question never mention about the instruction so I can use any step or instruction to solve it.

I did look at the panic modes example whch he use the B3:0 function.My friend said that we can only use the normal instruction such as timer,counter and relay to solve the problem.I will double check again with my lecturer this weekend.how about the Q3c ladder diagram?I think I miss the timer relay part?

note:I forget to change the preset tiem for both timer to 6000 and 1800. Q2cupdate2.doc

thanks for everyone help.Acually ,I am taking a part time PLC program.I just learn about PLC for 3 weeks and I can understand the basic instruction in PLC such as counter,timer.

I am sorry that I forget to add description on my ladder diagram.I will add it.

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Can someone please show me the a simple ladder diagram using a sequencer strategy such as : 1.fill up water in tank. 2.turn on motor 3.drain the tank Please help me.I really would like to know the basic step of using the sequencer.Thank

finally i manage to understand SQO.thanks for all the advice,tips and guide.

there are mistake in the destination address and the file name.

My plc program will not allow me to use the B10:0 as the file for SQO.It only allow me to use #N7:0.Can it work?

I attach a ladder diagram.Please give some comment and help me.I really getting confuse with SQO. sqo.doc

Thanks for the file but why there is no SQO and SQC instruction in the ladder diagram.

can you please convert the file to pdf format because my logixpro can not open rss file.thanks.

I got the PLC software from this webpage: http://www.thelearningpit.com/lp/logixpro.html