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Found 11 results

  1. How to connect + Program wire encoder

    Hi all, I am not a PLC expert but can find my way within the program and would like to develop much more. For work (We sell industrial bandsaws) we have purchased a Posital Fraba wire encoder, and we would like to hook it up to our Mitsubishi FX3G PLCs to measure at what height the saw bow of the bandsaw is at that moment. Unfortunately I have little experience with connecting these things, as other encoders used in our machines are pre-installed by our factory. Below is described what functions the wires have. What I thought was the following: Pin 1 goes to an input of the PLC Pin 2 goes to + (or 24V) Pin 3 doesn't go to "Ground" as they describe, but instead to - (or 0V), which is technically ground Pin 4 and 5 we don't use, correct me if I am wrong. The saw bow goes up and down only, and I thought we don't need to use these wires.   I connected it like this, connected wire 1 to X0 on PLC and just to test I made the program read:   M8000 ------------------------------ C235 k99999   But the value stays 0, whether I pull the wire or not. So something is wrong, but what, I really can't figure out. Hope someone can help!  
  2. Hi all, I am taking a Kubler draw wire encoder back to a 1734-VHSC24 and having a little bit of an issue with the rollover.  With the draw wire untouched the output value seems to be fluctuating over time and appears to be drifting backwards to the rollover value making our distance measurements completely useless.  Does anyone have any insight as to why that might be?
  3. I'm attempting to make a backup of a program, complete with comments. I go connect to the PLC over Ethernet, and select Use Upload File to merge the comments from an original copy of the program. After that, I go file-saveas to backup the program. However the new saved file, complete with comments is only 134 KB, and the very original copy of the program is 230 KB, from 2003. Is there a reason for this, the program hasn't shrunk in size, only minor tweaking of some span calibration numbers.
  4. Hey, I recently started trying my hand at creating function blocks. At the moment I'm trying to create a PID function block, however I keep getting this error: "ERROR: Variable does not have enough size." No idea why it does this. Can anyone help?  
  5. In the machine is array with size 100 (ARRAY [1..100]]. Can I simply change it to 200 without data loss?
  6. Exceed maximum step size

    Hi guys!   Need some help from the real specialists!   I`am used to work normally with Scheider Unity and make my program`s always in function blocks. Now working on my first GXworks2 project, and programmed the whole project also in FBD.   I have an FX2N-32MR plc, and defined in the configuration the maximum step size of the cpu to 8000 steps. I have compiled my program successfully, but the result gives an program size of 10217 steps. (and i`m not finished programming yet)   Converting the program to ladder or ST is not possible i think....?  (and i`am not very familiar with those languages) Add additional memory card is also not possible because of the type installation. Did have some self-made function blocks inside, but they are very simple.     How is counting of steps working in GXworks2? Are the 8000 steps for the complete project, or per POU, so than split into pou,s will reduce steps??  Strange is when i add one single BIT move block into the program, and compile again. Program size becomes 10229.  (so the one move block is 12 steps?)   Are there any tips for reducing the memory/program  load?     
  7. Hi All, I am pretty new at electrical design for PLC control panels. We are a UL508A shop, so this is the code I refer to most. Something struck me as odd when I was trying to size wire for this control panel. UL508A 28.3.1 says this: The required size of the field wiring terminal shall not be less than 14 AWG (2.1 mm2) and shall be determined by: a) Calculating the required ampacity per 28.3.2 – 28.3.6; and b) Determining the minimum field wiring conductor size from Table 28.1 having a corresponding ampacity that is equal to or greater than the required ampacity from (a). How can the minimum wire size be #14 AWG? We use #16 AWG for wire to the PLC modules? Are we breaking code or is there something I am missing? Also, understanding code books can be difficult. Is there a website or place I can go to get a plain English translation? I feel like I will read a sentence over and over again to try to understand what they are saying, and feel like there's is a much easier way to say it than the way it is written. For example, "28.3.1 b" ……...what is it really saying?  
  8. hi all   good morning i having problem to change the wire colour  i not sure why the others drawing can be done but not this one.   appreciate help eplan - wire colour cannot change.elk
  9. Good afternoon Mr.PLC forum members.   We recently had a fuse blow on the wiring between a 1756-OF6CI analog out card and a control valve (which we have no feedback for - only the 0-100% output). Took a little longer to troubleshoot since we have no feedback and we also don't monitor individual channel status of the card. For input cards (1756-IF8H or IF16H), it's easy enough to use the under-range/over-range or broken wire signal to troubleshoot a blown fuse or bad connection, and activate an alarm. I have been told by our local consultant-technician that there is an equivalent monitoring bit for output cards. Reading the instruction manual for the 1756-I/O cards, the fault channel bits do not seem to have this type of function for the 1756-OF6CI. The fault bits only seem to look at the requested output values, and at the connection between card and PLC itself as far as I can tell.  Am I missing something?   thanks for your help
  10. During run time on my KTP700 BASIC HMI panel, there is a keyboard pop-up screen that appears, when I press on an input field (for example, like the one in the inbuilt Logon pop-up screen). Is it possible to change the font size, and/or the size of the keys on this keyboard? How so? Thanks in advance.
  11. I am using a KTP700 BASIC HMI panel. I have two languages in the HMI program. On the inbuilt Logon screen, I want to show English text in size 21, French text in size 15. In Runtime settings > Languages and Fonts, I give each language different font sizes, but when I run the program on the HMI panel, they both show up the same size. (For example, I set English to font size 21, and French to font size 15. However, if I access the password screen in English, then later in French, the text is shown in font size 21 in both occasions). This is a problem because the French words are longer, and hence some letters get cut off. Any ideas about how to get around this? (besides just using font size 15 for both?)