10/13/2012 2:44 PM | |
Posts: 14 Rating: (0) |
dear all, Is that AO redundancy is available at s7400-H PLC system ,or Any Library to be inserted. Thanks and regards, suresh kumar.p |
10/13/2012 4:41 PM | |
Joined: 9/27/2006 Last visit: 10/8/2024 Posts: 12284 Rating: (2685)
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Hello suresh; The use of redundant analog inputs is described (configuration, wiring and redundant function) in the following manual, in Chapter 13: Using IOs in S7-400H. SIMATIC Fault-tolerant systems S7-400H Using analog input modules as redundant I/O You specified the following parameters when you configured the analog input modules for redundant mode: ● Tolerance window (configured as a percentage of the end value of the measuring range) Two analog values are considered equal if they are within the tolerance window. ● Discrepancy time (maximum permitted time in which the redundant input signals can be outside the tolerance window). The configured discrepancy time must be a multiple of the update time of the process image and therefore also the basic conversion time of the channels. An error is generated when there is an input value discrepancy after the configured discrepancy time has expired. If you connect identical sensors to both analog input modules, the default value for the discrepancy time is usually sufficient. If you use different sensors, in particular temperature sensors, you will have to increase the discrepancy time. ● Applied value The applied value represents the value of the two analog input values that is accepted in the user program. The system verifies that the two read-in analog values are within the configured tolerance window. If they are, the applied value is written to the lower data memory area of the process input image. If there is a discrepancy and it is the first, it is marked accordingly and the discrepancy time is started. Hope this helps, Daniel Chartier |
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