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how many calls of FB58 allowed in OB35

Created by: HassanShahat at: 7/25/2011 4:40 PM (7 Replies)

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7/25/2011 4:40 PM	Rate (0)
HassanShahat Experienced Member Joined: 7/3/2006 Last visit: 10/30/2024 Posts: 70 Rating: (0)	Dear friends How many FB58 or FB41 (PID Controllers) can be called from inside OB35 (Cyclic Interrupt) as a maximum ? I need 20 calls , is it possible or not? Thanks and best regards

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7/25/2011 5:23 PM	Rate (0)
billwest Posts: 510 Rating: (120)	This link should help you: http://support.automation.siemens.com/WW/view/en/17624666 Good luck billwest
billwest Posts: 510 Rating: (120)
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This contribution was helpful to 1 thankful Users dchartier

7/25/2011 6:58 PM	Rate (0)
IBN-Service Posts: 8946 Rating: (1000)	HassanShahat Dear friends How many FB58 or FB41 (PID Controllers) can be called from inside OB35 (Cyclic Interrupt) as a maximum ? I need 20 calls , is it possible or not? Thanks and best regards It is possible.
IBN-Service Posts: 8946 Rating: (1000)
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7/25/2011 7:02 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	HassanShahat Dear friends How many FB58 or FB41 (PID Controllers) can be called from inside OB35 (Cyclic Interrupt) as a maximum ? I need 20 calls , is it possible or not? There are 2 constrains that should be considered. Memory requirement and execution time FB41 CONT_C FB length in Kbyte: 1.5 DB length in Kbyte:0.4 Approximate Exection time(S7 300):0.4 Approximate Exection time(S7 400): 0.06 FB58 TCONT_CP FB length in Kbyte: 7.9 DB length in Kbyte:0.4 Approximate Exection time(S7 300):1.4 Approximate Exection time(S7 400): 0.15 Regards
	Last edited by: hdhosseini at: 8/3/2011 5:24 PM Demo Channel on Youtube
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7/25/2011 7:34 PM	Rate (0)
HassanShahat Experienced Member Joined: 7/3/2006 Last visit: 10/30/2024 Posts: 70 Rating: (0)	Many thanks for your great help

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This contribution was helpful to 1 thankful Users IBN-Service

7/27/2011 7:01 PM	Rate (0)
rapido4 Advanced Member Joined: 11/1/2009 Last visit: 8/27/2025 Posts: 9 Rating: (1)	One cpu cycle does not exceed 150 miliseconds, is used as requested. If cycle exceed 150 miliseconds, CPU is stopped.

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7/27/2011 9:22 PM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 8/31/2025 Posts: 6874 Rating: (1368)	rapido4 One cpu cycle does not exceed 150 miliseconds, is used as requested. If cycle exceed 150 miliseconds, CPU is stopped. As shown in the attachment the value can be changed in HW config --> cycle/clock memory the CPU's properties. The value can be changed in this case! Scan Cycle Monitoring Time Here, you specify the scan cycle monitoring time in milliseconds. If the scan cycle time exceeds the scan cycle monitoring time, the CPU enters the STOP mode. Possible reasons for exceeding the time are: · Communication processes · A series of interrupt events · An error in the CPU program Regards Attachment CPU.jpg (324 Downloads)
	Demo Channel on Youtube
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This contribution was helpful to 1 thankful Users rapido4

10/29/2011 8:03 PM	Rate (0)
metwally mustafa Silver Member Joined: 10/10/2010 Last visit: 7/5/2025 Posts: 309 Rating: (15)	many thanks to you MR. hdhosseini

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