MrPLC All Topics

PLC 5 to RIO PV 550 communications

Fri, 20 Nov 2009 19:57:49 -0500

Hello, I am working on a PLC 5/30 that is supposed to be communicating to a panel view 550 via a RIO network on Channel 1B of the PLC. This is a project that I took on when the processor somehow lost its program. I wrote the code back via a printed hard copy, but there are some missing links. I extracted the comms information from the panel view comms configuration screen but it still shows "No PLC Communication" on the panelview. The LED Channel 1B on the processor is not blinking, therfore I dont believe that the PLC is even attenmpting to communicate with the PV. There is also a BTW and a BTR that I believe is what is supposed to be handeling the information between the PLC and PV. I have attached screen shots of the setup as I have it now, I have not dealt with RIO very much much less an RIO PV and a PLC5 combination. Maybe someone out there can show me where I am going wrong.

http://forums.mrplc.com/index.php?act=attach&type=post&id=8171

http://forums.mrplc.com/index.php?act=attach&type=post&id=8172

http://forums.mrplc.com/index.php?act=attach&type=post&id=8173

http://forums.mrplc.com/index.php?act=attach&type=post&id=8170

analog scaling problems

Fri, 20 Nov 2009 16:13:24 -0500

Hi

I'm trying to change a project in my workplace.
I need to replace an existing analog input card with an analog in/output card on a Siemens S300 PLC.

The problem is that the input signal is 4-20mA but the I/O card reads 0-20mA.

Does anyone have any idea of some code that will turn the 0-20 into 4-20 so that I can integrate it into the original program?

Thanks in advance, Colin

How can I get ladder logic out of Series Three and onto PC or printer?

Fri, 20 Nov 2009 10:28:13 -0500

How can I get ladder logic out of Series Three and onto PC or printer? Want to upgrade to a 90-30, but don't want to have to convert from mnemonics. Any ideas??? Thanx

Mitsubishi FX25Du repair

Fri, 20 Nov 2009 09:56:46 -0500

Does anybody know who can repair these HMI's?

Cool Impementations of Automation to Attract Students

Thu, 19 Nov 2009 20:39:59 -0500

Trying too help the local college recruit more people to our profession. They have really invested in their Mechatronics program (mechanical, electrical, computer, and control engineering. Enrollment is up, but we need some devices to take into the schools that just shout "THIS WOULD BE A FUN PROFESSION TO BE IN!" to really make the program successful

His first thought was to build a segway. Great idea, but I've been trying to think of other things that we could use. Things that the current students could build...just remember it has to be portable so it can be taken from school to school.

What would grab a high school students attention when deciding what curriculum to sign up for?

SLC5/01

Thu, 19 Nov 2009 13:23:00 -0500

Hello Everyone,
We have a machine with a SLC 5 plc, the machine is down with CPU Fault light flashing. I can turn on the motor and see input LED lights indicating buttons pressed. But the machine will not cycle, the last time this occurred a local tech reset the CPU. Is there a way that I can do this? As the tech we had used is no longer around.

Thanks

RSLinx and Ethernet devices

Thu, 19 Nov 2009 11:27:44 -0500

Hello.

I have a 1761-NET-ENI Ser.B FRN 2.31.

RSLinx version installed: RSLinx Gateway version: 2.42

Rockwell publication : 1761-UM006E-EN-P august 2005.

Cables: 1761-PM02 and Ethernet cable (don't know how you say in English but the one with wires crossed).

Problem: Device not recognized.

I'm familiar with creating drivers through the Configure driver pop up screen. My version of RSLinx doesn't provide the second example of pop up seen on the page 3-6. I don't have the "Find device" button.

On page 3-7 there is a tip for the latest ENI. The link provided doesn't work.

There must be a connection between the PC and the ENI because the icon for the ethernet has no X on it when both are connected.

Is this an issue where you need a tech connect to obtain help?

thank you again.

Program Function List for Q-series PLC

Thu, 19 Nov 2009 08:30:27 -0500

Hey all,

I was just wondering... Is there a comprehensive function manual for the Q-series PLC's? We have one from a long time ago for the FX PLC's and it had every function and an explanation of what it did as well as some examples of how to use it. Is there anything like that for the newer PLC's? I know there are many more functions now-a-days and it would be a pretty big book but it would be very useful.

1768 Selection guide

Wed, 18 Nov 2009 22:35:19 -0500

Does anybody have a system qualifier for 1768 & 1769 systems? I have never put together a 1768 system so I haven't seen anything on the slots away from the processor. I found where I could use the L43 with (16) 1769 cards and (2) 1768 card. I just can't find out that goes where. I maybe over looking the forest because of all these leaves on the ground.

Panelview Plus 400

Wed, 18 Nov 2009 14:36:11 -0500

I have been working on a simple program that interfaces the PP400 with a Micrologix 1000 Analog. I have been successful with most of this except for inputting numbers into the screen that are supposed to go into the register. They are moving through the tags fine, but I was hoping to do the math in the panelview and send the converted result to the 1000. I am converting motor rpms and vacuum pressure into values that control the analog 4-20mA signal. The second difficulty I am having with this is I would like the screen to diplay the last input number, respectively. Instead I get ???? on one and #### on the other. Any Ideas?

- Lost as the Bills-

s5 plc file to pdf printout

Wed, 18 Nov 2009 08:24:12 -0500

I have a s5 plc with this program and we would like to do some changes but we don't have any idea whats in it could some one print it out?

thanks

tom

BCD Absolute Encoder

Wed, 18 Nov 2009 06:50:16 -0500

I have Hohner absolute encoder with MS-137BR01/360 with bcd output 10 bits, I want to connect to 1769-IQ16F (CPU 1769-L35E) and comvert to decimal using FRD instruction on RSLOgix 5000.
How to configure the connection to 1769-IQ16F? It is fast enough to read the actual machine position? How to zero the encoder?
Thank you for any suggestion or ideas.
Patty

Modbus speed for 13 slaves

Wed, 18 Nov 2009 04:10:37 -0500

Hi,
I am using Modbus PMCR Instruction to communicate with 13 slaves. Each PMCR is having 50bytes of data transfer (Receive+send using Function code 17). I have kept all times in protocol macro as minimum as possible 0.1ms each and maintaining 38.4K baudrate.
Whether this baudrate would be OK to transfer without any problem and how will come to correct times to set in macro?

Another question is now with a counter I am polling 13. To send a data to any perticular selected slave is taking 2sec time. I am thinking to reduce this time. How could i improve? My aim is to make 0.5sec and whether is possible?

somebody could help me?

PV+ over Controlnet errors

Tue, 17 Nov 2009 11:27:22 -0500

Hello all,

I have a control net network setup with 3 panelviews on it. i did not setup this network but have been charged with the task of maintaining it :)

The nodes are addressed 12, 13, and 14.

Everytime there is a power failure in the mill, node 13 loses communication and reloads the program as node 14 which causes it not to work.

How do i ensure node 13 allways stays node 13?

During the last power failure node 12 PV would not boot up with an error code 40 so I replaced the PV. node 12 now shows a mismatch in rsnetworx. how can i resolve htis?

I hope this is enough information to understand whats going on.

thanks

Panel View Plus Login audit results to SLC 5/05

Tue, 17 Nov 2009 11:04:04 -0500

Hi, I am trying to track the user login information on my panel view plus terminals and save it to a string file in my SLC 5/05 . Rockwell tells me to use a logout macro in RSView ME to send the user data to the ST file. I have set up the ST file in the plc and there is data being written to the file when the user logs out, the only problem is that the macro is supposed to update the string information with the user that is logging out, but it only results with writing "DEFAULT" to the string location in the PLC. Any ideas where I might be going wrong? BTW I have also tried using the MACRO attached to the login function, but due to the timing it dosen't work either.

The concept of the loop control

Tue, 17 Nov 2009 10:37:44 -0500

I have one question about loop control as I attach two pictures.

There are two types of control; the single loop control and the multi loop control.

In the single-loop control there are two valves which should be controlled; the one is the heating valve, the other is humid valve.
In the multi-loop control there are three valves which should be controlled; the one is the heating valve, the other is the humid valve and the third is the cooling valve.

how can I control the valve in these each cases and what is the exact different between single loop control and multi loop control?

Thanks.

function bloc

Tue, 17 Nov 2009 06:07:13 -0500

Goodmorning I work in a company that use more function bloc and I never did it I wanted help to know were I can go to download a manual to undersdtand ladder logic and specialy function bloc Im new in PLC .Thanks in advance for all your future feedback

Programming help

Tue, 17 Nov 2009 05:42:25 -0500

Hi
I am trying to build a logic for a machine which has 5 sequences,in other words depending on sequence chosen,outputs will be energized diffrently,using one of 5 logics,i would like to avoid using paralel branches but that's the only way i see.....may be subroutins?

Another question regarding subroutins-when subroutin is called,the main program is still implementing the logic in the main program or it's"stack" until subroutin is finished?
Can i duplicate outputs in diffrent subroutins which never ran simultaneously?

Since my expirience with PLCs is limited,i would appreciate a lot detailed answers.

Thanks.

IEC codes in specification sheets of AB hardware

Tue, 17 Nov 2009 02:12:28 -0500

Hi All
We have a "CLIENT" who is asking us whether the specifications of Allen-Bradley hardware (1756-L61, 1756-CN2R, 1756-EN2T,....) related to the EMC compatibility parameters - RADIATED RF IMMUNITY (as per IEC 61000-4-3), EFT/B IMMUNITY ( as per IEC 61000-4-4), SURGE TRANSIENT IMMUNITY ( as per IEC 61000-4-5) and CONDUCTED RF IMMUNITY ( as per IEC 61000-4-6) are actually acceptable as per referred standards and what they should normally be.
I have been able to give him a basic understanding on what these parameters are mentioned for, but how can I tell him whether they are within "acceptable limits"? I am having trouble getting any data for this and also IEC publications are not available freely. Please point me to any reference chart for the same (for e.g. it can provide data as: CONDUCTED RF IMMUNITY as per IEC 61000-4-6 < 10Vrms is safe for industrial working space, but maybe it is not suitable for hospitals?).
Thanks for any help.

sqo success

Tue, 17 Nov 2009 02:00:31 -0500

After a lot of research and studying, I finally figured out the SQO instruction.
Here's the problem. I'm using a ML 1000 32 pt. I loaded a program to control Christmas lights. Yes, Christmas lights.
I use an external timer to start and stop the program.
I noticed that, when I turn off the input. The outputs would stay on. Depending on which position the SQO was in.
I tried a re-set instruction. The control re-set to position 0. But, the outputs stayed on.
I'm missing something here. What instruction do I need to turn off all outputs?

Entivity Think & Do problems with Access database

Mon, 16 Nov 2009 12:00:34 -0500

We use Entivity Think & Do for pressure testing parts. When the parts are tested Think & Do uses an SQL statement to write records to an Access database hosted on the same PC. The problem is that it doesn't always write a new record and there doesn't seem to be much rhyme or reason why! We can't repeat the error on demand so we can't debug it accurately. Has anyone else had problems like this and if so how did you fix it?

The next step soon is to create an MS SQL database and see if it reliably writes to that instead.

Of course this is coming from a PC programmer who's only dabbled in AB ladder logic (which is a pleasure to code in) and never touched this flowchart based junk before (Visio as a programming language? Really?!). :P

Thanks in advance for all your help!

SLC 5/01 deported IO base

Mon, 16 Nov 2009 09:31:29 -0500

Hi everyone,

I'm pretty new with Allen Bradley PLC and i would like to expend my actual 501 PLC with a deported IO base. Is somebody can explain me what i need to do the job or where i can find info on that subject..... Usally i use Siemens.....

Regards

Limit acceleration when controlling speed with PID loop AB Micrlogix 1400

Sun, 15 Nov 2009 20:58:46 -0500

Hi Gents,

I've tried to look up some topics around the net regarding controlling the speed of a mobile plant running on tracks.The speed is to be controlled by a proportional valve which in turn controls the swashplates of a hydraulic powerpack driven by a diesel engine.
I have a 2000 pulses / rev encoder installed on the machine and wired back to to the High Speed inputs of the Micrologix 1400.I've built some code to simulate the process of controlling the speed with a PID loop.Instead of incrementing the HSC counts from the encoder itself on the machine I just add a constant value into F8:0 every time code is scanned.I fire a program file every 300 ms and subtract the value of the actual F8:0 from the value of F8:1 which is F8:0 300MS earlier which will give me the number of "pulses" the machine travelled in 300 ms so I can easily calculate the speed.Doing it this way I will always have a positive speed as the add instruction adds pulses.However the difference between F8:0 and F8:1 is not a constant.I believe this is a scantime issue.
Simulating montion by incrementing the value of F8:0 with a constant number will give us a constant speed as the number of pulses /time is a constant.Derivative of distance is speed where I consider pulses as k*distance.
When I chnage the number of which I increment F8:0 then I'll have acceleration as the number of pulses accumulated on the previous scan will be smaller than in the scan where the constant increased.Which is kool.
If I put another instruction in "ADD" to increment the number which I increment F8:0 with and trend it I will have the acceleration value jumping all over the place.Which comes down to scanning issues I think.Unfortunately I can't even attempt to apply a PID on the acceleration under this conditions.I really don't know how to cut the scantime out of it without using physicall hadware.
With the physicall plant the limitation imposed by the customer is that the Acceleration has to be less than or equal with 1.4m/s2 and maximum speed is 16km/h.I did simulate controlling the speed with a PID and that looks quite ok but when I try to simulate controlling the acceleration I just can't without having a stable value for it which I cannot obtain in my simulation.
To summarize I apply pressure on a pedal which is a 0-10v DC Analog input to the Micrologix.That dictates the speed to with I have to accelerate (max speed is 16Km/h = 10V) so I simply scale this input.The problem is that I have to limit the acceleration to 1.4 m/s2.I was told that the hydraulics can achieve more than 1.4 m/s2 (specially if there is no load).Could you please give some feedback whether I should use a PID at all or not and if yes whom should I controll with the PID the acceleration orthe speed .
Thank you for your time.

Hi Guys,

This is driving me nuts.I've made another file using the code posted here by someone called Ken Roach or similar which uses the free running timer to calculate the HZ from the encoder counts.Cool.If I have the frequency [Hz] I have the speed.
Since I have a micrologix 1100 but I have no encoder I thought I use the PTO function of the PLC.So when HSC reaches the preset value of 10 it executes the STI and I attempt to calculate the speed.Which is ok.However if you graph that speed the bloody speed will not be constant even after I do the first 1000 pulses of the PTO which I configured as acceleration.
I simply can't understand why I the PTO is asynchronous to the scan and I am using the S:4 TIME why the speed is not constant when the pulses generated by the PTO will be picked up by the HSC ??????????????? The HSC function operates asynchroniusly to the scan and since I wired O:2/0 straight to I:0.0 I should have the same number of pulses (after acc) between two consecutive HSC High Preset = 10 .Really simple.
Please help and point me out of here.Have a look in the attached file.Connect DC+ to O:2/0 COM then THE WIRE FROM O:2/0 goes to I/0 I/0 com goes to DC -.

ControlLogix and Keyence

Sun, 15 Nov 2009 20:34:53 -0500

I am trying to use a Keyence LJG laser controller with a ControlLogix to capture the profile of an object. The LJG is capable of taking a snapshot of up to 800 points of data at a time, but I'm having trouble getting that data into the ControlLogix. Does anyone have any experience with this that may be able to offer some advice?

s7 vat table

Fri, 13 Nov 2009 13:28:52 -0500

Is there a way too move the columns in the vat tables I would like the status value column between the address and symbol

I tried dragging and dropping, copy and paste and f1 help key I just don't see how to do it if it can be done.

tom