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1oo2 Evaluation and 1oo1 Evaluation in F module

12/8/2010 7:55 PM	Rate (0)
hextalker Posts: 18 Rating: (0)	Hi when I select a 1oo2 Evaluation in a F module, it should be 2 different channels assigned for this purpose and 2 different switches connected to it.Is it true? thanks
hextalker Posts: 18 Rating: (0)
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12/15/2010 8:07 PM	Rate (4)
jklm Posts: 1742 Rating: (309)	Hello, Let us take an example of a 1oo2: an Emergency push button. The push button is equipped with two contacts. Both contacts opens or close nearly at the same time (a few milliseconds difference is possible). A 1oo2 input has two physical channels (let us say the left and the right channel). One contact is connected to the left channel, the second to the right one. But in your program you interrogate only one bit, because it is the input card that evaluates if both contacts deliver the same information. In case of discrepancy (the contacts deliver a diffrent status) the failsafe input board will deliver a "0" (once the discrepancy timeout is elapsed). You will get a "1" only if both contacts deliver an ON signal.
jklm Posts: 1742 Rating: (309)
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This contribution was helpful to 8 thankful Users hextalker S7naga xmnj thongbvt Mitul_Pabari EduardoGarcia_MEX Jay J. LostDGF

12/17/2010 12:01 PM	Rate (1)
miami Platinum Expert Joined: 8/31/2005 Last visit: 12/16/2025 Posts: 2198 Rating: (331)	Maybe one of this helps you: F-DI and F-DO: http://support.automation.siemens.com/WW/view/en/24690377 F-AI: http://support.automation.siemens.com/WW/view/en/37236961

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This contribution was helpful to 7 thankful Users jklm hextalker S7naga mrvlica86 xmnj Mitul_Pabari LostDGF