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Rounding in value of tags with linear scaling

Created by: trini at: 9/12/2007 9:31 AM (3 Replies)

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9/12/2007 9:31 AM	Rate (0)
trini Posts: 19 Rating: (8)	Hi, I have a time value that the SCADA operator sets in seconds, but it has to be sent to PLC in milliseconds. The tag I have defined for that value is of type unsigned 32-bit value and I have defined a linear scaling for the tag where: process value 1000 -> tag value 1. The problem I have: when, for example, the value of the variable is 2500 in PLC the I/O field I have linked to the tag shows 3,0. The operator can introduce in the I/O field 5,6 for example, and in the PLC the value that is written is 5600, this is OK, but the value that is shown in the I/O field is 6,0 it is rounded. Does anyone know how can I avoid that rounding? WinCC v6.0 SP4 Thanks, Trini.
trini Posts: 19 Rating: (8)	Last edited by: trini at: 12.09.2007 11:52 Last edited by: trini at: 12.09.2007 11:44
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9/12/2007 12:13 PM	Rate (0)
Buzz LightYear Experienced Member Joined: 5/25/2007 Last visit: 11/25/2024 Posts: 83 Rating: (3)	Hi: Is PID parameter? You can set the type of the tag like this way WinCC Data type->Float point 32bit WinCC Adapt format->FloatToSignedDword Liner Scaling->ProcessValueRange 0-1000,TagValueRange 0-1, with regards BuzzLightYear Attachment WinCCIO.jpg (119 Downloads)

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9/12/2007 12:33 PM	Rate (0)
trini Posts: 19 Rating: (8)	It is a S7 time parameter. Thank you very much, I didn't think of that way of doing it. Thanks !!! Trini.
trini Posts: 19 Rating: (8)
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9/13/2007 10:01 AM	Rate (0)
IYYAPPAN S Experienced Member Joined: 12/6/2006 Last visit: 7/8/2024 Posts: 92 Rating: (0)	Dear Trini, U can try this Function Block, U need to pass a real vaue & it will convert Real Value to S5 time in milli secs Pls try the same & revere back Regards Iyyappan S Attachment Real_tim.zip (101 Downloads)

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