OTT PLS 500, Operating Instructions Manual

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Settings of the exponential formula (Q = p (h -e) ) according to ISO 1100-2:
The entries in the rating table can be set using the following two tabs. The value table is sorted in ascending order, therefore
it is not possible to write directly into the value table. With the aid of the two registers, the OTT PLS 500 controls the correct
insertion of the values into the rating table. If the maximum table size (50 entries) is reached, a write attempt is answered
with "NAK not acknowledge".
To delete a specific entry, enter the water level of the entry to be deleted and a discharge value of "–9999" in the format
"float32". To change a specific value, enter the water level of the entry to be changed and a new discharge value.
Please note:
To correctly change entries in the rating table, the water level register
must be written first
. When
writing a value to the discharge register, the register values of water level and discharge are taken over. If the sequence
is not observed, both register values will be discarded!
Register values with the entries "Water level" and "Discharge" of the rating table (empty entries are marked by the value
"–9999" in the format "float32"):
Register name Register-
number
1)
Data type
Length Access
mode
Description
Factor "e" of the
exponential formula 251 (250) float 32 2 R/W Coefficient: offset "e"
Factor "p" of the
exponential formula 253 (252) float 32 2 R/W Coefficient: scaling "p"
Factor "
β
" of the
exponential formula
255 (254) float 32 2 R/W
Coefficient: exponent "
β
"
Register name Register-
number
1)
Data type
Length Access
mode
Description
Water level 261 (260) float 32 2 W write water level to
associated discharge
Discharge 263 (262) float 32 2 W write discharge to
associated water level
Register name Register-
number
1)
Data type
Length Access
mode
Description
Water level 1 301 (300) float 32 2 R table entry 1: water level
Discharge 1 303 (302) float 32 2 R table entry 1: discharge
Water level 2 305 (304) float 32 2 R table entry 2: water level
Discharge 2 307 (306) float 32 2 R table entry 2: discharge
Water level n … float 32 2 R table entry n: water level
Discharge n … float 32 2 R table entry n: discharge
Water level 50 497 (496) float 32 2 R table entry 50: water level
Discharge 50 499 (498) float 32 2 R table entry 50: discharge
1) the corresponding register start addresses are given in brackets (register number - 1 = register start addresse)
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