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Fail safe PLC

Created by: Import-User-1 at: 6/4/2013 1:47 PM (10 Replies)

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6/4/2013 1:47 PM	Rate (0)
Import-User-1 Posts: 3609 Rating: (29)	Import of a Technical Question of the User B-gus B-gus Dear All Expert, Currently I have to design PLC with 80 DI, 112 DO, 24 AI and 8 AO. This system using fail safe and must certified SIL 2. I only need 5 output failsafe others I use standard I/O. This system also complete with 2 processors. Until now, I dont know what kind of PLC that I have to choose. Please help me, Thank you,
Import-User-1 Posts: 3609 Rating: (29)
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6/22/2013 11:12 AM	Rate (0)
RKM Posts: 93 Rating: (13)	Dear user, For such small fail safe application,you can select from s7-300F fail safe CPUs. and solution which supports the s7-300F cpus and related signal modules are S&-Distributed safety. Detail discription and features can be found from below given link. Also for SIL-2 application it's better to go with S&-distributed safety. I would suggest if you should go through below given link to find suitable CPU,cards and other related assesories. https://www.automation.siemens.com/mcms/programmable-logic-controller/en/simatic-s7-controller/s7-300/cpu/fail-safe-cpus/pages/default.aspx?HTTPS=REDIR
RKM Posts: 93 Rating: (13)
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6/22/2013 5:57 PM	Rate (0)
Khaled_Ezzat Silver Member Joined: 9/7/2007 Last visit: 8/30/2023 Posts: 550 Rating: (61)	Import-User-1 Import of a Technical Question of the User B-gus B-gus Dear All Expert, This system also complete with 2 processors. Thank you, HiB-gus; Do you mean by 2 processors a redundant configuration or 2 processors working separetly. If they are in redundant configuration you shoud go to S7-400FH. else, you can use the S7300 F.
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6/23/2013 6:39 PM	Rate (0)
RKM Posts: 93 Rating: (13)	Hello B-gus, There is substantially clrear difference for fail safe systems in Siemens. S7-Distributed safety- used for machine level application and consist of only S7-300 Cpus. programming langaugesare F-LAD or F-FBD and off-course F-DB whichare instantatious only. S7-F/FH systems- used for plant level application and consist of higher level CPUs of S7-300 and all S7-400 cpus including H-fault tolarunt systems. programmuing langauge is CFC. also related package for wincc flexi or wincc is also there for visualization. Hope this will further clear your concepts.
RKM Posts: 93 Rating: (13)
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6/24/2013 6:23 AM	Rate (0)
B-gus Posts: 9 Rating: (0)	Dear Khaled, I need 2 processor redundant with hot swap application. It's only S7400H hope...?
B-gus Posts: 9 Rating: (0)
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6/24/2013 6:54 AM	Rate (0)
Amit_86 Platinum Member Joined: 3/18/2008 Last visit: 12/8/2023 Posts: 1750 Rating: (272)	B-gus Dear Khaled, I need 2 processor redundant with hot swap application. It's only S7400H hope...? Hello, yes you are right. S7400H- H Stands for Hot Standby.
	VANDE MATARAM.....
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6/24/2013 1:12 PM	Rate (0)
Khaled_Ezzat Silver Member Joined: 9/7/2007 Last visit: 8/30/2023 Posts: 550 Rating: (61)	Amit_86 B-gus Dear Khaled, I need 2 processor redundant with hot swap application. It's only S7400H hope...? Hello, yes you are right. S7400H- H Stands for Hot Standby. Hi B-gus If you require only Hot Swapping you can make it without using S7-400H you can only use the Bus units for Et-200M I/Os or if you are using ET200 S/SP/ISP they are hot swappable by default Hi Amit_86 In S7-400H the letter "H" stands for High Availability.
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6/27/2013 6:27 PM	Rate (0)
RKM Posts: 93 Rating: (13)	Dear friends, For normal IOs, hot swapable feature can be implemented using active back plain bus. and for fail safe IOs, hot sapable feature is disabled as it has to rectify the acual status of input using 1oo1,1oo2,2oo3 operation so in case module is faulty safety mode is disabled automaticaly. also according to me hot standby and high availability both are alternative to hot swapability.
RKM Posts: 93 Rating: (13)
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6/28/2013 10:23 AM	Rate (0)
Khaled_Ezzat Silver Member Joined: 9/7/2007 Last visit: 8/30/2023 Posts: 550 Rating: (61)	RKM Dear friends, For normal IOs, hot swapable feature can be implemented using active back plain bus. DearRKM For Hot swapping you must use Bus Module Unit 6ES7195-7HB00-0XA0 for standard IO Modules RKM and for fail safe IOs, hot sapable feature is disabled as it has to rectify the acual status of input using 1oo1,1oo2,2oo3 operation so in case module is faulty safety mode is disabled automaticaly. There is great difference between hot swapping and passivation and activation of the module. Simply, hot swapping feature enables you to remove a module from the middle of the rack without causing disturbance to the modules mounted after it. RKM also according to me hot standby and high availability both are alternative to hot swapability. "hot swapability" is not an alternative to "hot standby and high availability". You can have a hot swappable system without having "hot standby and high availability" system.
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7/6/2013 9:17 PM	Rate (0)
SMHZ Bronze Member Joined: 10/19/2012 Last visit: 4/17/2022 Posts: 315 Rating: (9)	Try S7- FH system which are both Fail-Safe & Redundant systems if you want.

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