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I have a driver, siemens micomaster 440. I want to control a 3phase induction motor with this inverter via PC using MATLAB. I think there are a few method for this such as profibus, RS-485, USS etc. Which one is better? And I will send data which involves speed,direction, start, and stop info. which data sholud I send? I don't know structure of data. For instance, 1. byte = direciton 2.byte = speed .... .... n.byte.

Thanks everybody I will examine....

Im new with Siemens. I couldnt understand OB,FB, etc. blocks structures and couldn't find using of these in manuels. How will I use these blocks when I generate a new program? Help please... Sorry I haven't indicated that I will use S7-300 so I've Step7 software

Function 67 is RAMP function. And you can find this manuel in downloads.

I know I,Q,C,T,M but What are the memory area "L" , "D" and others in the programming applications? How can I find this terms in programming manuel? Icoldn't find...

Hi, I will control a D.C. motor with a FX2 PLC.Im using GX Developer. This motor start to run with acceleration. (Firstly slow and it will speed up with a ramp in 2-3 seconds). And motor will be slow down end of this motion. (This motion's Velocity-Time curve will be similar with y=X^2 function.) I know smoothly data operation in GX. How can I do with GX Developer, Which function can I use? Thanks for helps...

I ve post an example about blocks.There are 2 blocks. One of them is SFC and other is ladder. Ladder is General Control. Im using ZRST instruction in this ladder and its resetting SFC's steps. general_control.bmp

Hi homer, you can use in-line comparisons. In this compare, you can use K,H,K, KnX, KnY, KnM, KnS, T,C,D,V,Z. For ins. [= T0 D15]-------------() (Assume that Data15=2000 and T0 is 100ms timer) regards, untitled.bmp

Hi waus Im using GX Developer. but I don't know differences betwen GX and GX IEC. Im using zrst ınstruction.Firstly I build a general Control near the SFC blocks which is writing in ladder.And for example Im writing -||--------------[ZRST S0 S100] this instruction is resetting the first 100 steps

Hi Waynes. Thanks for help but I coldn't have a look link that you give.I think it's have a problem...

Thanks Waynes but no. I don't want to compare two statement. That was an example.I want to learn all of In-line compare statements.

JY992D48301 JY992D88101 JY997D16601 You can use these pdf names and look for in google with other key words for example FX,PLC, mitsubishi etc.

Thanks Panic, But I usually use BMOV instruction for data registers D. for example directly D1,D2,etc. And I know that it is used with KnX, KnY, KnM, KnS, T,C,D, V, Z (RAM) File registers, How can I use for M bits and Outputs?

Hi Crossbow, I think idea that you said is right. The problem is M bits which are not used as coils. You said that I find a solution using OR contacts. How do you use this contacts and what do you make "OR" with ? --------||---------- | X1 | |__?____|

Make sure the plc is in RUN that was great!....