4/5/2023 8:20 AM | |
Joined: 4/15/2022 Last visit: 7/31/2024 Posts: 28 Rating: (0) |
Hi all! I have an FC that monitor the temperature of an PTC. I understand that the alarm tag is set to 1 when the value applied at the input is minimum 32768 (in decimal) or 8000 in HEX. But i don`t understand how the prewarning tag is set. This tag has the state of L1.2. I mean, if the value of the input is even just 4, isn`t supposed to set the L1.2 in TRUE state? And what gives me headache aswell is, when I'm trying to monitor the values in the FC doesn`t appear something in the ACCU1 and the value in the ACCU2 is the same no matter what the value of the input is. But when I monitor the value in the FB where the FC is called, a value appear. And the last question...is there a way to monitor the L-stack online? I saw that I can see the L-Stack in "Module Information" but just in Stop or Hold mode. AttachmentL stack.zip (363 Downloads) |
4/5/2023 9:07 AM | |
Joined: 1/21/2013 Last visit: 10/9/2024 Posts: 3170 Rating: (491) |
Hi Automation_lover, Based on your screenshots, I assume the function is designed for the 2AI RTD HF analog electronic module (6ES7134-4NB51-0AB0). If the range is configured as PTC, you are not measuring a temperature. This setting is for switching PTC thermistor, which have a highly nonlinear resistance-temperature curve. For this reason, the manual shows a resolution of 1 bit for PTC values and also describes the process input image for this special case, since it is not an analog value in this case. You may not see the correct values when you monitor the block because the block is used at different times. You should monitor the block with the desired call environment. And no, there is no way to view the L stack while the PLC is in RUN mode. Kind regards |
Last edited by: Stefan Arcularius at: 04/05/2023 09:08:01Typo corrected |
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This contribution was helpful to1 thankful Users |
4/5/2023 9:25 AM | |
Joined: 4/15/2022 Last visit: 7/31/2024 Posts: 28 Rating: (0) |
Thank you so much! You were right about everything. Your knowledge it`s impressive.. btw. |
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