markaren1

Help needed with first AB PLC program Hi All, I am struggling to get a first piece of code running on a 1761. All I initially want to do is copy Input 0 to Output 0. Comms between PC and PLC is via an RS232 cable. I have installed RSLinx V1.7, configured an RS232 DF1 device using auto configure. Running SuperWho indicates two boxes "STA0, DF1-COM1" talking to "STA1 UNTITLED" with the latter blinking. If I disconnect the RS232 cable, the animation stops blinking. Sounds like PLC and RSLinx are communicating. After installing RSLogix Micro Starter... File -> New -> Bul.1761 MicroLogix1000 using AB_DF1-1 driver Select LAD2 MAIN_PROG, Insert a new rung before END Drag Examine If Closed to left of new rung, double clcik on it and set to I0:0/0 Drag Output Energise to right of new rung, double click on it and set to O0:0/0 Edit->Verify Porject (1761-micro appears below the two inserted instructions) File->Save As -> bitcopy.rss (processor name UNTITLED) Comms->Download At this point the message "No response from processor at selected Path/Node!" I have tried this with two different 1761 units. both units appear to behave the same. Pointers what I am doing wrong will be most appreciated. Thanks, Mark

Many thanks for your help. Regards, Mark

Hi Guys, The top of the units appears to have two small recessed trimmers marked '0' and '1', any idea what they are for ? I am also looking for a copy of the manual for the 214 unit, I can only find more recent manuals. Pointers to where go hunting will be appreciated. Thanks, Mark

Many thanks. I ended up uninstalling everything then installing http://files.rockwellautomation.com/Public...roLite_Linx.zip (134+ MB) Unfortunately the package available on MrPLC (33MB) does not have the bundled RSLinx drivers, and that was what appeared to be the issue. Regards, Mark

Hi All, Just acquired one of these unit and am looking for some quickstart guidance... Have downloaded and installed RSLogix Micro which seems to run OK and assume that a COM port is used to transfer data to the PLC. Please could I have a summary of the limitations of this software when used unregistered (is that possible ?). Are there any designs for the interface cable available so I can make one up (or must I go searching on eBay ?) Many thanks, Mark

Hi All, Many thanks for your time with my earlier round of questions, I am slowly bringing the machine to life... Further questions: 1) Always true. I currently synthesize this using (LD X0 ORI X0) which is always true. Is there a short cut to start on the left of the ladder with 'always true', if so how ? 2) Any idea of the stack depth of the machine - how many times can you LD X0, LD X1, LD X2 etc. until the first entry gets lost ? 3) I am sure that I read something which implied that it might be possible to code for the native microprocessor then link to the interpreter somehow ? 4) I assume that the Annunciator is the noise maker and there is a stored value associated with the noise being triggered ? Thanks, Mark

Hi All, I am new to PLC-anything (my background is embedded C) and have been given some Mits AOJ2s and I/O modules to experiment with. This is mainly education for me rather than any specific goal. I have built an SC09 look alike, and have MELSEC MEDOC running (one saving grace is it's win32, so I didn't have to dust off a real DOS machine). I am struggling my way through the AOJ2 programming manual and have some simple ladder logic running. More by luck than judgement I also have figured out Monitor Mode so I have some visibility into program behaviour. Several questions: 1) Is there anything Windows based that is readily available that is less difficult than MEDOC in terms of User Interface ? I am of course interested in a further $0 investment :) I was told that FX-something supports the AOJ2 but I can't readily find a download. 2) Are there any decent tutorials for the AOJ2 ? I have found quite a few reference books on the general subject of PLCs but the "AOJ2 Programming Manual" leaves a bit to be desired in terms of ease of understanding from a newcomers point of view. 3) I would like to output a 16 bit variable to Y20..Y2F. It looks like I should be shifting into M9012 then bit copying to Y20 etc. ? There must be an easier way (maybe using the Y or Z registers ?) Any other easy methods I should investigate ? 4) Has anyone done anything extremely daft like make their own peripherals ? It seems like a reasonably simple bus with an HC85 magnitude comparator for device selection... 5) It looks like the machine is stack based (hence the RPN style of programming). Are there any other details about the core of the processor / interpreter model ? I am mildly interested in cooking up some other form of programming interface - transfer protocol and machine instruction bit patterns would be very helpful. All comments gratefully received. Thanks, Mark

Yup, I can see my problems now. Thanks. ============ On a different topic I am trying to get T0 to count to 10 then restart (so it continuously counts with a T0 event every 10th count). Any pointers ? T0 K10 --|/|------(T0)---- T0 --| |------[RST T0]---- | ----[iNC D0] --- So D0 continuously increments every 10 T0s Thanks, Mark

Hi Crossbow, et al, Thanks for all of your replies. Any ideas how much I might spend on an FX CPU with internal 230VAC psu and 16 relay+contact closure I/O ? I am having a difficult time navigating www.meau.com for manuals I seem to end up at http://www.nagoya.melco.co.jp/english/products/index.html which has plenty of stuff relating to the FX. I can find the FX CPU manual (JY992D48301) but there doesn't seem to be an option to download the document, do I need to set up an account ? Where are the AOJ2 manuals held ? Have they all been withdrawn from the site now ? Attached is my version of the SC09 interface. I used 26LS3x ICs that are more readily available that the other design I saw on the MrPLC site. Regards, Mark SC09.pdf