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  1. Hello all, I am working on a project where I am communicating with a Mensor CPT6100 pressure transducer using a Micro-850 PLC. For this, I have used an AWA instruction to write some ASCII characters to the sensor. The sensor then responds to the write instruction by sending ASCII characters to the RX buffer and I used ACB and ARD instructions to read the ASCII characters. Now, I have set the ACB trigger type to 0 (msg triggered only once) and it successfully reads from the sensor. However, when I set the ACB trigger type to 1 (msg triggered multiple times), I do not get any reading in the ARD block. As a matter of fact, the ACB Q bit switches off every time the program is executed when the trigger type is set to 1. I am trying to get continuous readings from the sensor, but when the trigger type is set to 0, the program latches on to the first and only reading and it won't change. My question is, how can I change my program so that it can continuously and autonomously read from the sensor without me having to manually trigger the AWA and ACB instructions every time. I am attaching the program to this thread for your reference.  ASCII_Test_Copy.ccwarc
  2. Hi: I am trying to determine if I should use the RS 5000 or RS 500 to start a micrologix 1400 project that will include a Maple Systems HMI. I have never used the RS 5000 software so I am aware there will be a learning curve, however I am certain that it could be useful in the future.  However, my work schedule is nights so I am limited in how much tech support I will get here at my facility when no one is using RS 5000 here at this time? Your input and feedback will be greatly appreciated. Thanks in advance.  
  3. SLC 500 and SMC Ex260

    I'm trying to connect a SMC EX-260 to a Allen Bradley Micrologix 1400 PLC so  I can run some valves with it. However, RsLogix 500 doesn't allow me to just setup a generic ethernet device like I would on RsLogix 5000. Is there a way I can communicate these devices together so I can use the SMC Valve system with my Micrologix?
  4. Square Wave Problem With Micrologix

    Hello all, this is my first post. I am using an AB Micrologix 1400 (1766-L32BXB Ser C FW 21). I was trying to generate a pulse train using the PTO instruction. I have modified PTOX funct. file. The ladder is just a simple XIO followed by PTO, (The Quick Start ladder from 1766-RM001). When I looked at the output waveform on my oscilloscope, I noticed that it wasn't a square wave. I decided to run it at several different frequencies to see how the wave form would change. At 10Hz i got a square wave. As I increased the frequency the falling edge became sloped and almost horizontal. Is this how the output should behave? The data sheet indicates a max frequency of 100kHz, but at frequencies over 150 Hz. The wave form looks like the output of SMPS. 
  5. Signal Tower Error Code(s)

    Hi, got a mental block lol.  Got a machine we are modifying, currently got most of the code in place. Working on a fault routine now. This machine doesn't have an HMI or wide array of PL. Nothing major just a simple vision system check. Currently have 6 faults that will stop the cycle running. I'm wanting to have the beacon light (Red light) blink for the cause of the fault. For example: Scenario 1- Fault stop for bottle check NG:  (two) .5 sec blinks -  2 sec red light off -  (two) .5 sec blinks ..... repeat  Scenario 2- Fault stop for bottle check NG and reject sensor blocked:  (two) .5 sec blinks -2 sec red light off - (three) .5 sec blinks - 2 sec red light off....... repeat I have the code a few different ways but it looks "dirty". Any suggestions? Thanks in advance  
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  7. Hello - we run a car wash that is controlled by a Modicon TSX Micro 3721001. It is indicating a CPU fault. I've attached a picture of the unit in place, with the LEDs lit. I have ordered a new base unit (2nd picture). I haven't tried it out yet, but it is tested working. I am hoping a base unit replacement will solve the problem, but wondering if it it possible the problem could be in the modules? I did not order those but now wondering if I should have... If the issue could be with the modules, is there a way to test which one it would be so I won't need to order all 4? If it coult be a module, I might order that now as I am in a rush to get back in service. Thanks for any guidance! Andy
  8. We have a carwash automatic controller board with an Eagle Signal Micro 190 PLC.  The program has been reloaded after power outages from a MX207l1 EEPROM Memory Transport Module for over 20 years.  Suddenly the reload isn't working -- either the MTM lost it's program or the socket has worn out over the years.  Anyway, the program can also be loaded via a 9-pin serial cable from a PC.  In trying that, we've found that the program the vendor gave us on the PC doesn't match that on the MTM.  Testing shows that only one output is incorrect.  We simply need to change output on O22 (broken trace on the board 20 years ago) to O20 (which would then match the MTM code).  I am a software engineer, but have never used ladder logic in a PLC.  I *think* I have changed the output, but maybe I just changed a comment.  [Testing requires powering off the carwash, with loss of $$ if we can't get it back up, and $80K expense for total failure, so trial-n-error isn't feasible.]  (1) Can anyone discuss what I did with me so I have a better idea if it will work or not?  (2) Is there anyone in the Atlanta area willing to look at this?  Thanks for reading!
  9. My project is to read an RFID tag (ascii) with a Micrologix 1400, send the string to a PC using Ethernet/IP, lookup and compare in an Excel spreadsheet, and send back data (probably an integer) for the plc to use to control direction. I have to scan and compare an RFID tag to a list of 1400 possible part numbers, at different locations (more than 1 plc). I want the several PLCs to go to a single PC to make it easy to update when changes occur (on a weekly basis). Has anyone done anything like this? I'm assuming there will have to be some kind of vb or c+ application involved.   Thanks,  CK
  10. Hello,  please i wish to simulate HSC in Allen Bradley 1400 using a square wave generator. i have built and tested the square wave generator it works well, the issue is how to wire it to Allen Bradley 1400. also i wish to understand IO Configuration filter settings, am using Allen Bradley 1400 B series Processor  Thanks  Square wave generator simulating with AB 1400 for HSC.pdf
  11. Hello, I'm new to PLC Programming, with just a simple course about the basics. I've got a micrologix 1400 PLC which seems to have had its program wiped when the battery was replaced. I've had the company that supplied the machine it runs send me the program for the PLC. However, I don't have any software to communicate with it, and download the program to the PLC. I was hoping some one here could help me out and direct me towards what I will need to do to get the new program installed on the PLC. Thank you 
  12. Hi my problem may have a simple solution but i cant work it out. I need to use the Divide function but it wont let me use a decimal point in either Source A or Source B. Is there a way to use a decimal point in Logix 500 Math instructions? Im using an AB Micrologix 1400 PLC. Can you only use math instructions with whole numbers? is there a way around this? Thanks James
  13. Hi my problem may have a simple solution but i cant work it out. I need to use the Divide function but it wont let me use a decimal point in either Source A or Source B. Is there a way to use a decimal point in Logix 500 Math instructions? Im using an AB Micrologix 1400 PLC. Can you only use math instructions with whole numbers? is there a way around this? Thanks James
  14. Micro 850 to Logix5000 comms.

    I am trying to read data from a Micro 850 into my L18 (V 30.11). I have never set up an ethernet bridge between these 2 components and i have been up against a wall since starting. I have the MSG blocks in my routine but i am obviously configuring either the bridge, MSG instruction or something wrong. Any help will be GREATLY appreciated!!!
  15. Micrologix 1400 Float TAG

    Hello,  I have a micrologix 1400 plc connected to a length measurement gauge. The gauge sends an analog value to the plc to an analog input. I convert the value into a dimension and send it to F8:0. but I need this value in three different steps in the program. Since i just have one element of float (F8:0) is there anyway i can store the value in a different location or create more floating point tags eg. F8:1. F8:2 ?    Thank You   
  16. ENCODER IN MICROLOGIX 1400

    Dear Sir, Kindly Tell me how to use encoder with micrologix 1400. Thanks
  17. Hello,  As the title indicates, we have a micrologix 1400 that has been installed for a long time.  Recently it faulted out on 71h and was in Remote Mode.  Do these PLCs revert to Remote Mode when in a fault condition?  We placed it back in Run Mode and everything worked fine, but how did it get to Remote Mode in the first place? Thanks,  J 
  18. Is it possible to communicate from a PC program to PLC program for reading inputs and setting outputs? How can it be made ? is it possible to do from TER connector or AUX connector , without special comm module?
  19. Trouble Wiring a Simple LED with a Micro820 Controller

    Hi everyone, Recently, I started working with the Micro820 Controller Embedded I/O. My project is simple : when the output _IO_EM_DO_00 is set to true, an LED light turns on. But, even though it's super simple, I can't make it work. Here's my setup. If you need more information, feel free to ask anything !
  20. Hello all, I am still fairly new to this forum and PLC's in general. I am trying to connect a EA9 touch panel via Ethernet to an Allen Bradley Micro Logix 1400 PLC. I am using Ethernet over serial because I need the serial connection to program while using the touch panel. I have given the Panel the IP Address 192.168.1.20 with a subnet mask 255.255.255.0 and I have given the PLC the IP address 192.168.1.10 with a subnet mask 255.255.255.0. The panel is not communicating with the PLC and I have very little knowledge on the subject, anyone's help would be greatly appreciated. The picture on the top is from the PLC and the picture on the bottom is from the C-More program for the panel.
  21. Socket communication with Micro820

    Hi everyone ! I have a little project wich involves communication between two Micro820 controllers via TCP/IP. To do that, I started to work with TCP/IP socket. Within CCW (Connected Components Workbench), I tried to create a new socket instance using the instruction SOCKET_CREATE and set the socket address to 127.0.0.1:21. Basically, my computer through the FTP port. The problem was that it couldn't create a new socket instance (error variable is set to TRUE and status is set to 4, wich I don't know the meaning) because I didn't have a server-side application that listens to TCP/IP socket requests. That said, I found an open source application called SocketTest that listens for TCP/IP socket requests on a specified IP address and port. So, I started a listener on the following address : 127.0.0.1:21, but the error variable is still set to TRUE and status is still set to 4. So, my questions are : Is my IP address OK ? Is my port number OK ? What means the status code 4 ? Is SocketTest doing what I think it does ? Do I need to do something else before using the SOCKET_CREATE instruction ? Thank you in advance for your help !
  22. Can't connect to Micro820 controller via CCW

    Hi everybody, Recently, I started working on a project. I want to develop a program for a Micro820 controller (2080-LC20-20AWB) using CCW (Connected Components Workbench). I built a little motor circuit for testing purpose. However, after building the program and downloading it to the controller, I tried to connect to my controller via CCW, but I can't. When I click the button "Connect", CWW crashes OR a window saying : "The controller has unnacepted changes" appears and asks me if I want to "Download current project to the controller" (wich I already did) or "Upload the project in the controller to overwrite current project content" (wich is grayed out). When I choose to "Download current project to the controller", CCW starts downloading the resource, but fails. In the "Output" window, there's a line saying : "Download failed for Device:Micro820: An error occured while reading from GETACTIVERESOURCELIST.". The problem is that there's no documentation at all concerning this error. I even tried to reinstall CCW, but it didn't fix the problem. I joined some images so you guys can see what I'm talking about. Don't mind asking for more details !
  23. Good morning i want to know how i can recognize into the compactlogix 1769-L24 ER the micro 850 (2080-LC50-24QBB), because i want to communicate this two devices with MSG, i already i can see these two equipments into RSlinx but when i start Studio 5000 i don't know whick module i have to use it to recognize the micro 850, please help me
  24. Hello, I have AB PV 300 micro HMI and AB ML 1000 PLC . i want to configure it so how i can do it ? is it possible to configure both without AIC ? Which cable is required please help me.   Thanks in advance
  25. I'm designing a PLC system in which a Micrologix 1400 talks Modbus TCP/IP with three Modbus TCP-capable SCR controllers. I've never done Ethernet/Modbus TCP communication using the 1400, so I'm asking the following questions: 1. Can I connect the 1400 PLC and the three devices to an Ethernet switch and configure Modbus TCP communication from the devices to the PLC (data collection only) ? The switch will also be connected to the customer's DCS, receiving the data from the PLC and the three devices. 2. Can I connect the Ethernet port on the1400 PLC to the Ethernet switch directly, or do I need some kind of Ethernet interface, like the 1761-NET-ENI ? 3. The system also includes an HMI, connected to the 1400 PLC by RS-232 communication. Any issues with communicating with the HMI and doing Modbus at the same time? Your help in this matter would be highly appreciated. Thanks. Ron