https://forge.codesys.com/forge/talk/Runtime/thread/a15f650f68/2024-04-15T11:22:37.490000ZRecent posts to Slow modbus digital input response2024-04-15T11:22:37.490000Z2024-04-15T11:22:37.490000Zmarcolimhttps://forge.codesys.com/u/marcolim/https://forge.codesys.com5911ec1f6eee6d1f2d2ad54ddf8ae17c262093dc

<div class="markdown_content"><p><span>[Update]</span>.<br/> My issue's solved, I applied the resistors in Pull-down configuration on each digital input.<br/> In thus configuration never happened "floating or delaying" acquisition on SoftPLC/Arduino Board.</p></div>

2024-04-13T14:47:35.987000Z2024-04-13T14:47:35.987000Zmarcolimhttps://forge.codesys.com/u/marcolim/https://forge.codesys.comd80ebd9da5682d724a90af90467f2b7060d4e00f

<div class="markdown_content"><p>Hi francoinf, <br/> I've the similar problem and similar configuration. <br/> I did with an Arduino Board loaded by a ModbusRTUServer application on it.<br/> What I've notice is the slowly acquisition when release the digital signal (e.g. pin2) when it gets off.</p> <p>Anyone have suggestion?!<br/> Thanks</p></div>

2020-09-16T07:56:04.160000Z2020-09-16T07:56:04.160000Zfrancoinfhttps://forge.codesys.com/u/francoinf/https://forge.codesys.com1731c7b18ed02b454ee830b4d9371089e01949e0

<div class="markdown_content"><p>Good morning,<br/> I am creating an application in which I have to read the variation of a digital signal, through modbus rtu, with a frequency that varies from 1 Hz to 15 Hz, but unfortunately the speed of<br/> response within codesys is very slow (I can capture a maximum variation of 2 Hz; above this value, I cannot capture the variations).<br/> Below I describe what I did: the digital signal read by the modbus controls an event task (every time the digital signal passes from 0 to 1, the event that enables<br/> the task). The task activates a routine that increments the counter by one unit (in this way I can count the number of rising edges in a given time interval).<br/> When the frequency of the digital signal does not exceed 2 Hz, I can perform this count, otherwise not (the variation of a fast signal is not captured).<br/> From the outside I see that the signal varies correctly, but codesys does not detect it.<br/> I used:<br/> - a baud rate of 115200 (I started from 9600 up to 115200, without getting any improvements);<br/> - the master bus cycle task is controlled by a 50 ms cyclic task (I have changed this interval, without obtaining better results);<br/> - the trigger of the modbus channel for reading the digital signal is cyclic, and set at 50 ms (I have changed this interval, without obtaining better results);</p> <p>With a modbus testing software, on the other hand, I am able to instantly capture the variation of the digital signal; it is within codesys that I can't.</p> <p>Can anyone help me?<br/> Thanks in advance</p></div>