Xylem Expert 7060_7070_Modbus - Manual (Page 16)

Communication protocol Serie30
Page 22/37
Description:
Nr. Name Description Read Write
0 CFG_P Active pressure channels (high priority):
Bit 1: P1
Bit 2: P2
D U
1 CFG_T Active Temperature channels (low priority):
Bit 3: T (Temperature sensor)
Bit 4: TOB1 (Temperature of pressure sensor P1)
Bit 5: TOB2 (Temperature of pressure sensor P2)
D U
2 CFG_CH0 Calculated channel: Byte value (decimal)
0: inactive
1: Difference P1 – P2
2: Difference P2 – P1
3: Square root calculation sqrt(P1)
4: Square root calculation sqrt(P2)
5: Square root calculation sqrt(P1 – P2)
6: Square root calculation sqrt(P2 – P1)
7: SF6 Density with external temp. sensor
8: SF6 Normalized pressure at 20°C with an external temp. sensor
9: SF6 Density with TOB1
10: SF6 Normalized pressure at 20°C with TOB1
11: Absolute value abs(P1)
12: Absolute value abs(P1 – P2)
D D
Device has to be
restarted.
Please note
that for some
settings there
are some
more
configuration
needed.
Contact
Keller for
details.
3 CNT_T Temperature measurement interval in seconds. D D
4 CNT_TCOMP
LP-FILTER
Value of Bit 0 ... 3 (LowNibble): CNT_TCOMP
After CNT_T * CNT_TCOMP seconds a temperature compensation will be performed.
Value of Bit 4 ... 7 (HighNibble):Low pass filter for P1 and P2. LowpassFilter = 2 Bit 4 ... B7
The formula for the low pass filter is given as:
ter LowpassFil
n n
ter LowpassFil
n
P P
P
2
) 1 2 (
1
1
+ ⋅ −
= −
+
where:
P
n+1
: new filtered value
P
n
: actual measured value
P
n-1
: old filtered value
D D
5 --
6 --
7 FILTER Filter setting for one conversion:
Bit 0: Adaptive filter for P1 and P2 (on / off)
Bit 1: Low pass filter for T, TOB1 and TOB2 (on / off)
Bit 2 .. Bit 4: Over sampling ration OSR = 2^ (8+Bit 2 ... 4)
Bit 5 .. 6: Amount of samples per averaging: 0 ..3 = 1, 2, 4 or 8 values.
Factory settings see FILTER_ORG.
D D
8 --
9 DAC Analogue output:
Bit 0: Milli Amperes output (4 .. 20mA)
Bit 1: Voltage output
Bit 4 = 1: P1 is linked to the analogue output
Bit 4 = 0: CH0 is linked to the analogue output
Scaling see function 30/31
D (D: Bit4)
see below *
10 UART UART settings:
Bit 0 .. 3: Baud rate
Baud rate Value = 0: 9’600baud
Baud rate Value = 1: 115’200baud
Bit 4: Parity selection. 0: no Parity, 1: Parity enable
Bit 5: Parity mode. 0: odd parity, 1: even parity
D D
11 FILTER_ORG Factory setting for filter value. D U
12 STAT Status of the measurement. See function 73 for details. D U
13 DEV_ADDR Device address. Range: 1 .. 255. D D
* : With firmware Class.Group -Year.Week = 5.20-10.40 and earlier: Change of bit4 is allowed (to link the analogue output either
to CH0 or P1).