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Multiple alarms triggered at the same time

Created by: matt1115 at: 7/9/2019 8:44 PM (3 Replies)

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7/9/2019 8:44 PM	Rate (1)
matt1115 Posts: 23 Rating: (2)	We have a scenario where up to 250 alarms could go off at the same time. During our testing we noticed that it seemed like not all 250 alarms would go off (Maybe half would go off). However, when the alarms are tested individually they always work. Is there any limit to how many alarms can go off at the same time?
matt1115 Posts: 23 Rating: (2)
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7/12/2019 11:02 AM	Rate (0)
Heisenberg2 Gold Member Joined: 5/3/2017 Last visit: 5/21/2024 Posts: 673 Rating: (217)	Hello matt1115, of course there are limits, for example the AS has a limitation of the memory to record the alarm state, limited communications, ... The exact limit of the number how many alarms can switch at the same time I don't know. There are several factors: Cycle and Response Times of the S7-400 or CPU 410 cycle and reaction times the Setting in the HW Config about the Scan cycle load from communications single or redundant mode of the AS single or redundant mode of the OS Server is there additional AS-AS communication The only available example I know with the performance measuring with PCS 7 is with OPC, perhaps it is helpful. With regards Heisenberg

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7/19/2019 10:56 PM	Rate (0)
matt1115 Posts: 23 Rating: (2)	While I understand that there are limitations to everything, 200 does not sound like a lot to me. Would there be anyway to increase this limit?
matt1115 Posts: 23 Rating: (2)	Last edited by: matt1115 at: 07/19/2019 22:56:46
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7/20/2019 5:53 PM	Rate (0)
Thomas_v2.1 Silver Member Joined: 9/15/2006 Last visit: 10/23/2024 Posts: 503 Rating: (82)	Check the parameter of the maximum communication jobs in your hw-config, marked in this FAQ: https://support.industry.siemens.com/cs/de/en/view/604010 I remember there is a PCS7 manual where it is described what settings are recommended for a PCS7 AS. In my PCS7 projects I've counted the number of Alarm_8 instances in my program, an set the number to a value slightly above when possible by the CPU limits.

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