in this instance I have the number 1 in cell i1 and it writes a 1 to my plc bit named Reset_Pointer, this is a dint. The is the cell in the excel spread sheet that I chose to hold the data I wanted to write the the PLC. RSIChan = DDEInitiate('RSLINX','F2905_Snap')ĭDEPoke RSIChan, ' Program:MainProgram.Reset_Pointer', RSLogix 5000 On-delay (TON), Off-delay (TOF), Retentive On-delay Timer (RTO) Timers This video discusses the basic RSLogix 5000 Allen Bradley PLC Timer. In this instance, the topic is F2905_Snap, and Program:MainProgram.Reset_Pointer is the tag that I am writing to. This generally runs every morning at 4am and is automated by a function within the application.

This is all done in the dev section of excel, I have a button that triggers this on the main page so I can trouble shoot it as needed. PRE is exposed outside of the AOI, and Im using less memory and fewer instructions (not that either matter much anymore in modern processors). Of course you will need rsLinx OEM and set up the topic for your PLC. One technique that I use to avoid having to do a MOV of an Input parameter into a timer preset is to make that Input parameter tag an ALIAS of the local Timer tags. This is what I use to write a value to my plc after I pull all the data I wanted. 01 second timers, possibly eliminating the need to change time base.Do you have a guide to do writes to PLC via dde? So next, my question to the origianl poster is what is the customer trying to accomplish in chaning the time base? There are some timer tricks that can be done to create accurate long duraion. Preset value is from -32,768 to 32,767 If a timer-preset value is. I doubt that any of the other methods suggested such as copying two timers to a third or using indexed addressing past file boundaries will work either. shows an example presented in different ways using controlLogix development tool. So I am left to conclude that in the case of a timer, the time base bits in the data table don't mean a thing, the instruction operates as programmed, not as the data table indicates. Remember to Turn captions on and subscribe DHow to use TON (Timer ON Delay) timer in rslogix 5000 / Studio 5000 - 2021 - With a sample usecaseFollow us: htt. 01 to 1.0 and the change was reflected in the data table. And when I toggled B3/201, the time base was changed from. In this example I’m using ACCArray16 with a DINT data type. FIFO The Array in which to store the signal or variable. Generally, this would be a process variable like a weight scale, pH, or temperature. 1 second and set the /dn bit as expected. Source The signal or variable that you want to store in the array. So I edited the ladder so that T4:0 had a.

But when the timer was re-enabled, it still counted for 10 seconds. 01 in the data file as expected, as shown in the third image. Then I disabled the timer and toggle B3/202. Right-Click on CurrentTime and Select Monitor to view the tag in the controller tag database. When I enabled the timer, it counted for 10 seconds and set the /dn bit as expected. Dest: CurrentTime 0 (This is a tag you will create, DINT type with an array of 7) Image by Brandon Cooper. This didn't surprise me as I figured the logic in the display would be static.Īs you can see, I first programmed a 10 second timer with a 1.0 time base. However, it is not reflected in the ladder. This is updated and reflected in the data table for the timer. And when B3/202 is toggled, the time base is. I wouldnt worry about structure text using a. Notice how bit N7:0/9 is set, and when copied back to the timer by toggling B3/201, the timer time base is 1.0. The most memory consuming data structure by default is an ALMD or ALMA. Next, I expanded the program to include logic to mainpulate bit N7:0/9 and write back to the timer. See the technote 21729 for more information on this. It is always updated, even when the timer is not running. This is a copy of the reference time stored in the timer. This is refleccted in the screen shots I made. One thing you will notice if you try this yourself online is that the low order byte of N7:0 is always changing. Bit 9 appears to be the one that sets the time base on the SLC5/05 (A Micrologix will need two bits because of the additional time base options) Here is a composite screen shot of the two timer configurations. 01 second time base and look to see which bits were setting the time base. It appears to work, but it in fact doesn't work.įirst thing I did was to first program timer T4:0 with a 1.0 second time bas and then with a. I tried my previous suggestion out on a SLC 5/05.

Rslogix using tag as timer preset