The theme “scale analogical signals” is always recurrent in any PLC families.
The S7-1200 has two instructions to do it: SCALE_X and NORM.
I wrote a FAQ suggestion about the theme, which was approved but not yet published. In this mean time, I let here a draft of it.
I attached also a project with a version for S7-1200 of the S7-300/400 FC105 / 106. It was not tested, so if some one tests it please let know if it works.
- V11 version was posted in the follow post of this TIP (page2).
- V12 version was posted in the follow post of this TIP (page3).
news on V12:
New Blocks (that could be used also in S7-1500):
SCALE_LREAL / UNSCALE_LREAL (for the case where is necessary an extra - accuracy in the scaling)
RESCALE / RESCALE_LREAL (to scaling REAL to REAL or LREAL to LREAL)
SCALE_TC_RTD (to convert analogical inputs for Termo coupler or standard RTD)
SCALE_ RTD_climatic (to convert analogical inputs for climatic RTD)
|=== Edited by Pegaia @ 3/3/2013 5:09 PM [GMT ] ===|
=== Edited by Pegaia @ 3/3/2013 5:07 PM [GMT ] ===
=== Edited by Pegaia @ 8/29/2011 3:56 PM [GMT ] ===
Note for V11
=== Edited by Pegaia @ 2/18/2010 10:21 AM [GMT ] ===
The new version has news blocks for SCALE / UNSCALE of 4..20mA done by analog modules that has just 0..20mA.
=== Edited by Pegaia @ 7/27/2009 2:00 PM [GMT ] ===
I have tested the blocks. Here is the revised version.
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