Sleepy Wombat

connecting the right pairs can sometimes work... but not recommended... I would by an advantech ADAM 4510 RS422 to RS 485 isolator....( i think that is the correct number off memory) at least then you have isolation between the plc and power meter

there is home automation by legrand hpm and there is also one by Clipsal called C-Bus (now owned by schneider) ... i have used the clipsal stuff with "glass saturn light switches" very neat with a home of around 90 lights... very flexible... bit different from PLC programming but pretty happy with the result.

I know that this might sound stupid... but when the PLC is in program mode... the code in front ie contacts etc can show the on state green (as they should if on in the real world) yet the coils will be off that use standard IO and W words as they are non retentive..

Can your boss elighten us all of this formula to go by...... ? = B + S

were the drives running the conveyor... were the drives communicting on the CLK (controller link network) as well... could be a nuumber of different things... you have really only given us a small amount of info..

DanW is right. the meter will more then likely be a modbus slave.... that been the case you can use protocol macro... in the download section for omron there is a modbus protocol.. also there is a sample program called modscan which allows you computer to communicate modbus to a slave...(but remebmer tthat is rs232 so need a convertor)

Are you using a usb to rs232 convertor as well ? i found it a struggle the other day to get onto a CQM plc using a cif 01 and the usb convertor.... found that i had to plug the usb convertor in first then connect the cif 01 to the plc... you might struggle to get responses at the moment also due to the chrissy / new year time...

You are an outstanding individual Tim... well done.. !!

great work "lost control"..

1. ever heard of heat interia ... 2. if you have a really small P then the action will only happen when you are close to the set point, much like an on off control... so of course you will over shoot... 3. you are using PIDAT... might i suggest you read about PID and understand the implications of changing the values... having a small P and large I and D values will not help you. since you struggle with the understanding of the PID function, might i suggest increasing the control period and then run an auto tune... in auto tune you will have over shoot (it happens twice) as the block works out the dynamics of the process.... can be minutes/hours depending on the process...for the auto tune to work it out... there are mathematical ways to work it out but if you do not know what a pole and zero is then I cannot teach you that... 4. learn what each paramter will do and how it is utilised and how to disable a function....

is you want more then the standards 8 words x 2 - then you could use a send receive response... ie use word L0 as the word that tells which frame of info you are sending... set up you initial set of words then put a 1 in L0 for set one...in PLC two copy the L0 to L8 then read back L8 and if = to L0 then write the next set of words to Lset L0=2 and repeat... a bit like a multiplexer... a bit of coding, but it can work...

Scada Version 6 .... what product / brand ? more then likely, if connecting via serial, use the Host Link / Sysmac Way protocol if you can... if via etherenet, then use Fins.

Not to sure if others have that specific book... especially since it would be copyrighted.. For a quick heads up on PLC's etc, download the free copy of the book by Hugh Jackman, on the hompage and in download sections. Read this and it should give you a bit of a heads up http://forums.mrplc.com/index.php?autocom=downloads&showfile=156

Just looking at converting / supplying control panels with Control Logix plc system. Have been using SLC as it had been a standard system. New customer now wants to use control logix in stead of the SLC... Could some one please point me in the right direction as to where to start how to convert - easily... and any pit falls... The logic is pretty basic, using counters and timers, latching relays, flashing of lamps, controlling solenoids etc. Have the hard equiv sorted out... just looking at the simplest and quickest way to do the conversion... Happy to RTFM, just tell me which one. Thanks,

All my Tags/Symbols were easy to determine what they are, also the associated description/comment has always being included as well... So to be honest, in this case the poor maintenance guy / whatever should not be missing out on any thing... Tags should be succinct and not be like reading a sentence... ie would you use Solenoid Valve 1 or SV1 (or SolVlv_1) as a tag name... of a limit switch you could start with LL_.... or in the case of level switches HHL_Brk_Tnk, HL,LL ,LLL .. etc.... the programs i do are also rung commented extensively as well, also, i am a strong believer that the maintenance guy / plc programmer should have a grasp of the controlled process before even going near the controller code... and then if the maintenance guy still can;t work it out then, perhaps it is time to find another job..

Thanks for the clarification there Bob.. confirmed what I had been reading... Ken, yep compact logix was my orig choice... but they want to standardise on control logix... so that is what they are going to get and pay for.... thx all..

Thanks for the heads up Ken, couple of glitches, the version of RS I have is version 13.03... and the manual that you ref is for version 19... i did notice a few differences... ie the Status File routine is not automatically generated in the ver 13 with the translation tool but it is with version 19.... in the program it does not ref any S bits so might be ok there.... the translation tool basically created an mcpMain and inserted a jump to sub routine... and the ladder was created as _2_LADDER.... so far looks allright... now as i understand it, i need to create the IO table so to speak, then map the real IO to the generated IO from import funtion... thx...

found the manual, now to RTFM... will keep updated if need further assistance... thanks..

there is no quick instruction for 32 DINT - that is 64 words to compare.... the only other way is use the MCMP - this is generally used to compare words - then in the result word, a bit is turned on where there is a mis match,,,, you should be able to use this still as bits will turn on where a match... you will have to execute 4 variations of the command.

Try this link. in the download section.. http://forums.mrplc.com/index.php?app=downloads&showfile=990 also check out the omron website, as i am sure they have links to their manuals.

File Name: W396-E1-03 CJ1-TCxxx PLC Temp control module File Submitter: Sleepy Wombat File Submitted: 17 Aug 2012 File Category: Manuals Omron CJ PLC - CJ1-TCxxx Temperature Controller Special IO Module Click here to download this file

Have you tried swapping the IO block.. and if you do and the problem follows the IO block then there is something wrong with the IO block. That is one of the things I would certainly try.

If the PLC code is password protected as set in syswin, when you try and connect to the PLC, you will have a dialogue pop up stating that the program is pass word protected.. you cannot see any code if it is PW protected. The programmer had to set this with syswin and is enabled with a FNU 49 call in the first line of the PLC logic.

Syswin gave you that option. because as I recall, you could use a hand held programmer and edit the program and insert an end instruction before the very end of the program. This code after the END was never executed, and if you uploaded into syswin then try to download (with two end instructions) you would get a compile error.