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support.automation.siemens.com | Technical Forum | Sunday, December 15, 2019 11:08:45 AM

fast alarms between plc and hmi

Created by: Ziemens at: 10/3/2014 9:39 AM (6 Replies)

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10/3/2014 9:39 AM	Rate (0)
Ziemens Silver Member Joined: 3/2/2007 Last visit: 9/16/2019 Posts: 661 Rating: (5)	How can we make an hmi operator panel detect fast alarms? The scan cycle of the hmi is at least 100 ms, while the scan cycle of the plc is between 10 and 20 ms. So any alarm happening in less than 100 ms will not be detected by the hmi. We have thousands of alarm messages, many of them are fast…
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10/3/2014 9:58 AM	Rate (0)
Kahl Gold Member Joined: 12/16/2012 Last visit: 12/13/2019 Posts: 606 Rating: (109)	Hi! We use discrete alarms most of the time. When an event happens, an alarm bit is set in the PLC, which is also sent to the HMI. With an acknowlegment mechanism (auto or manual) the alarm bits are reset.
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10/3/2014 9:58 AM	Rate (0)
Jaapie Gold Member Joined: 1/17/2006 Last visit: 11/28/2019 Posts: 779 Rating: (58)	Please make use of the special alarm functions within: ALARM_P (if available) ALARM_S ALARM_SQ ALARM_D ALARM_DQ This will solve your problem! The alarm is set in the PLC itself and status, date and time is send to HMI. good luck, Jaap
	Last edited by: Jaapie at: 10/3/2014 10:00 AM
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10/3/2014 10:12 AM	Rate (0)
TIBI68 Gold Member Joined: 12/1/2009 Last visit: 5/19/2019 Posts: 662 Rating: (131)	Dear Ziemens Ziemens How can we make an hmi operator panel detect fast alarms? The scan cycle of the hmi is at least 100 ms, while the scan cycle of the plc is between 10 and 20 ms. So any alarm happening in less than 100 ms will not be detected by the hmi. We have thousands of alarm messages, many of them are fast… The HMI does not detect the alarms, it's the PLC. As Jaapiementioned correctly use the ALARM blocks to generate the alarms. Best Regards.
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This contribution was helpful to 1 thankful Users MicroMan

10/3/2014 2:27 PM	Rate (0)
Ziemens Silver Member Joined: 3/2/2007 Last visit: 9/16/2019 Posts: 661 Rating: (5)	Kahl Hi! We use discrete alarms most of the time. When an event happens, an alarm bit is set in the PLC, which is also sent to the HMI. With an acknowlegment mechanism (auto or manual) the alarm bits are reset. but if the ack is auto, ack could happen while an alarm is just coming up, and the alarm will be reset before sending it to the hmi. and is the ack is manual, it will take some time to ack hundreds of alarms.
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10/3/2014 2:30 PM	Rate (0)
Ziemens Silver Member Joined: 3/2/2007 Last visit: 9/16/2019 Posts: 661 Rating: (5)	Jaapie Please make use of the special alarm functions within: ALARM_P (if available) ALARM_S ALARM_SQ ALARM_D ALARM_DQ This will solve your problem! The alarm is set in the PLC itself and status, date and time is send to HMI. good luck, Jaap i checked these blocks, they do all the alarm messaging job in the plc; but they don't look like they can save a fast alarm, to make it available for the hmi.
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10/3/2014 3:15 PM	Rate (0)
MicroMan Platinum Member Joined: 11/29/2011 Last visit: 12/9/2019 Posts: 1317 Rating: (214)	Hi, Actually a good question. See the following links: Description and test project: http://support.automation.siemens.com/WW/view/en/24013249 A detailed description: http://support.automation.siemens.com/WW/view/en/841294 If you have doubt about the message numbering procedure with fast trigers, test it with PLCSim. (For example use the test project from the above page, set it up with PLCSim then Simulate a 1 shot to trig one of the prepared message and see if you get the message on the HMI runtime window.) Please let us know what did you found. I hope I could help! Cheers:
	- What you read here, please check with manuals and your requirements. - Do not forget to Test, Test and Test... - If the post is helpful, please RATE it! MicroMan
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