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Found 6 results

  1. PLC Not fast enough?

    Hello, I used a Schneider Electric SR3B261B PLC to create a trivia machine (as I call it).  Basically 20 buttons that let contestants ring in to trivia.  There is a display that shows the number of the person who rang in.  It works pretty well unless people press the buttons at exactly the same time.  Then it shows 2 results at the same time.  Usually resulting in a display of 18 when really it was 12 and 14 that rang in, for example. The PLC has options for: "Adjustment of the basic cycle time of the module."   and "Type of Hardware Input Filtering." Which I assume would make the PLC operate faster and avoid two inputs triggering at the same time.  If I change the setting and update the changes do not keep.  I appear unable to change it past 20 x2 ms  and slow (3ms). Is that a correct assumption that changing this would fix it? Why can I not change this?  Is it because I have so many inputs (14 or so) and Outputs (16 or so)? or because my program uses nearly all 240 lines of ladder logic allowed? What can I do to fix this?   Emerald
  2. Cycle Timer

    Hi all, I try to realize a cycle timer. A counter is triggered by a movement ( clamp close ) Then the machine does it things, piston here, and there and when the clamp closes again it should show me the real cycle time. Is there a timer/counter that is independent from the PLC cycle? I am using a CJ1M CPU11 Ver. 3.0
  3. I would like to use the actual Cycle Time (in seconds) of the NJ101 CPU in a Structured Text  math equation.  You might also call it the Task Period... However it's called, It needs to be the amount of time that has elapsed from the last calculation of the ST math equation.  It must be a variable that also satisfies this looping equation: Time:= Time +cycle time .. so that the master equation, which is calculating position information, based on TIME .. is up to date with each calculation in the loop. How do I insert that cycle-time, which might not be identical for each loop, (or, is it) ?  Thanks, Regards, Michael  
  4. Hello, I got a new work job to design a cycle tester for a mechanism to make sure will work for at least 5000 cycles open - close. I never made a pls program I start researching few days ago and seams to be very complicate to make it. I have a TM221C16R PLC from Schneider. please help me with some instructions. the cycle tester will have a start pushbutton, stop pushbutton, door open switch, one air cylinder with solenoid to push and pull and a counter. Thank you, Romica
  5. Hi, I am a beginner to PLC. I am currently working on a home project with Allen Bradley 1100 model. The project is to build a door open-shut cycle tester.  The motor I have purchased is a Bodine Brushless DC34B/FV INTEGRAmotor. My goal is to utilize the Allen Bradley to to control the motor and then the motor drive a shaft to open/shut the door. Through the LCD screen the of PLC, we can set and view the amount of cycles.  I have finished the initial stage of wiring. But not sure how should I start on the programming part. Could any of you give me any hints on the programming portion? Thank you so much. 
  6. ML1400 and C400 Resetting Values

    At work we have been having a slightly increasing number of instances where the Micrologix 1400 that is paired with a Panelview C400 resets values when we cycle the power. Originally we thought the solution was a bad battery in the ML1400. This was the case the first few times that it happened. However, we recently had one doing the same thing and when the program was loaded onto another PLC and HMI combo it had the same issue. So either the battery for both just happen to be bad, or there is something in the program that is forcing the values to automatically reset when the power is cycled. I cannot post the program on here but I can tell you that the tags that are being reset are only used in the PLC program once. There are six total that are being reset and they are the high and low range in an SCP function that is used to scale inputs. I will be testing the program myself in house on a bench setup, but I wanted to get this question out there as soon as possible in case it is not an obvious problem. Has anyone seen this before? Any suggestions? If I come up with an answer I will post it. Thanks.