10/11/2019 9:58 PM | |
Joined: 9/27/2006 Last visit: 10/12/2024 Posts: 12287 Rating: (2685)
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Hello Atif; In Siemens automation parlance, an H-CPU is considered fault-tolerant (redundant, hot swap), ann F-CPU represents a Failsafe unit (Safety PLC). Combined, a S7-412-5HK06 CPU can be both at the same time, a S7-412-5FH PN/DP). You will need to add an optional F-Systems license (6ES7833-1CC02-0YA5) to the H-CPU to work with the failsafe program and IO. See the description of the S7-400HF CPUs in the following presentation: https://support.industry.siemens.com/cs/ww/en/view/109742100 SIMATIC High Availability Systems, Tailored redundancy... with integrated security Flexible Modular Redundancy (FMR) Depending on the automation task and safety requirements, FMR allows the configuring engineer to separately define the degree of redundancy for the individual architecture levels comprising controller, fieldbus and I/O. Each component within a level can be provided with a redundant configuration, and also physically separated. All components also meet the requirements of safety integrity level SIL 3. You can then implement individual, fault-tolerant architectures exactly tailored to the individual tasks which can tolerate several simultaneously occurring faults. As shown in the example of a plant with ET 200M distributed I/O system, the totality of the tasks can result in a mixture of different degrees of redundancy within an architecture level (1oo1, 1oo2,2oo3). Here is a manual showing the development that is required to work with these systems: SIMATIC Industrial software S7 F/FH Systems - Configuring and Programming https://support.industry.siemens.com/cs/ww/en/view/109742100 A S7-412-5JHK06 can handle the number of redundant failsafe ,modules you are stating, but its work memory is limited to 1MB. If your failsafe and redundant program becomes more important, you might want to look at a CPU 414-5HF PN/DP, it offers 4 MB work memory. Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 10/12/2019 00:15:11 |
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