Skip to Content

Register Login

Industry Online Support

Technical Forum

Navigation

S7-400H redundant system - How to detect lead CPU

Created by: Techy at: 1/22/2007 1:34 PM (5 Replies)

Rating (2)

Thanks 0

6 Entries

1/22/2007 1:34 PM	Rate (0)
Techy Posts: 86 Rating: (2)	Hello , I have a s7400H system, & would like todetect which CPU is in Lead (Master mode). I tried using SFC51 RDSYSST but am not able to fully configure it[:mad:]( One of the blocks output is STRUCT, How do I define it?). Is there any easier method to detect it? I want to use the bit to switch CP441s located in each CPU racks. Anyonewith words of wisdom? Thanks, Techy[:)]
Techy Posts: 86 Rating: (2)
Suggestion To thank Quote Answer

1/22/2007 3:28 PM	Rate (1)
Chris Silver Member Joined: 8/31/2005 Last visit: 5/17/2023 Posts: 217 Rating: (40)	Hi Techy! I don't know exactly how to read this data from the CPU using the SFC51. But to detect the master CPU I use this: Sample program: reading out the operating state and status of an H system
	Greetings, Chris
Suggestion To thank Quote Answer

1/25/2007 7:37 AM	Rate (0)
Techy Posts: 86 Rating: (2)	Hey Chris, Thanks for the linkl, it sure helps[:)] Regards, Techy
Techy Posts: 86 Rating: (2)
Suggestion To thank Quote Answer

1/25/2007 11:59 AM	Rate (1)
Aret Posts: 2348 Rating: (259)	Example in SCL SSL_Head : STRUCT lenthdr: WORD; n_dr: WORD; END_STRUCT; SSL_Dest : ARRAY [0..15] OF BYTE; //RETURN; // Определение какой из ЦПУ мастер i:= "RDSYSST" (Req := 1, SZL_ID := w#16#71, index := w#16#0, busy := tbool, SZL_Header := SSL_Head, DR := SSL_Dest); Master_in_Rack0 := (SSL_Dest[2] AND b#16#10) <>0; Master_in_Rack1 := (SSL_Dest[2] AND b#16#20) <>0;
Aret Posts: 2348 Rating: (259)
Suggestion To thank Quote Answer

1/31/2007 4:38 PM	Rate (0)
Techy Posts: 86 Rating: (2)	Aret Thanks[:)]
Techy Posts: 86 Rating: (2)
Suggestion To thank Quote Answer

7/26/2016 6:09 PM	Rate (0)
Min_Moderator Platinum Member Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4812 Rating: (123)	New question published by Alipst1968 is split to a separate thread with the subject S7-400H, power feeder PLC switch off. Best regards Min_Moderator

Suggestion To thank Quote Answer

|

Share this page:

Share this page on...

Follow us on