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OTT PLS 500, Руководство по эксплуатации

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8  RS-485 Interface with Modbus protocol (RTU) 

8.1   Preconditions 

 

▶

 OTT PLS 500 variant code:                                 M 

➝ 

Protocol RS-485 interface                               Modbus 

 

▶

 Measurement type                                             continuous measurement  (interval mode or floating mode)

 

 

▶

 Interface                                                            

EIA-485 (RS-485)

 

▶

 Transmission parameter                                     8 Data bit, 1 Stop bit, Even parity 

▶

 Transmission speed                                            9 600 (factory setting), 19200 

▶

 Bus address                                                       1 … 247 

 

8.2   Value ranges 

 

   

Note:

 The OTT PLS 500 has only one "Holding Register" Block.

Modbus Register

  1

Byte 

0 

 

 

 

 

 

 

 

1

Bit 

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

16-bit Integer values

int range: –32767 … 32767
uint range: 0 … 65534
bitfield16 range: 0 … 0x7FFF

int range: –214483647 … 214483647
uint range: 0 … 4294967294

float32 range: see IEEE 754

32-bit Integer values

Floating point values

String values

Modbus Register

  1

Byte 

0 

 

 

 

 

 

 

 

1

Bit 

31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

IEEE 754 

sign

 Exponent 

Fraction

Modbus Register

 1 

2

Byte 

0 1 3 4

Bit 

31 … 24  23 … 16 

15… 08 

07 … 00

Modbus Register

  2

Byte 

2 

 

 

 

 

 

 

 

3

Bit 

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

IEEE 754 

Fraction least

Modbus Register

 

1 2 3 4 5 6 7 8

Byte 

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Bit E 

X 

A 

M 

P 

L 

E 

spc 

S 

T 

R 

I 

N 

G 

! 

NULL

39

Содержание PLS 500

Страница 1: ...English Operating instructions Pressure Probe OTT PLS 500...

Страница 2: ...We reserve the right to make technical changes and improvements without notice...

Страница 3: ...the OTT PLS to the IP data logger OTT netDL using an SDI 12 or RS 485 interface 14 5 8 Connecting the OTT PLS 500 to the Sutron XLink 100 500 data logger using an SDI 12 or RS 485 interface 15 5 9 Con...

Страница 4: ...0 including FAD 4PF 4 including FAD 6 6 Operating instructions without 0 German D English E French F Spanish S Accessories Humidity absorbing system OTT FAD 4PF 63 025 021 4 2 Desiccant cartridge in w...

Страница 5: ...d are indicated by the signal words Warning Caution and associated pictograms orange yellow warning triangle in these operating instructions WARNING Warning of a hazardous situation with a medium leve...

Страница 6: ...echnical data are adhered to For further information see Chapter 13 Technical data Handle the pressure probe cable with care do not kink the cable or pull it across sharp edges Minimum bending radius...

Страница 7: ...ne second duration 250 milliseconds each An OTT PLS 500 measurement interval is defined as the arithmetic mean of individual measurements over an adjustable averaging time The averaging time is 0 5 59...

Страница 8: ...as example Installation type B pressure probe suspended see Chapter 5 2 Pressure probe OTT PLS 500 Pressure sensitive membrane of the relative pressure measuring cell Cable suspension accessory Pressu...

Страница 9: ...at do not always hold water The pressure probe can be installed in two ways Installation type A fixed in an individual protection device e g plastic pipe adapted to the respective instatllation site a...

Страница 10: ...t be fulfilled position the probe below the minimum water level if possible difference between max water level and position of the probe measuring range of the probe Fix the pressure probe according t...

Страница 11: ...depth There are markings on the cable every 0 25 m to assist orientation Lay the pressure probe cable in the opened clamping jaws of the cable suspen stion as shown in Figure 1 and secure the pressure...

Страница 12: ...le in loops taking into account the minimum bending radius Find instructions how to shorten the pressure probe cable in Annex A If necessary the pressure probe cable can be lengthened For this purpose...

Страница 13: ...r electronic control system when doing this Refer to Fig 5 for the wire assignments of the OTT PLS 500 used wires red blue green and orange The maximum cable length is 1000 m Required wire cross secti...

Страница 14: ...4 Connect the OTT PLS 500 to the IP data logger OTT netDL as shown in Fig 6 left Also follow the operating instructions of the OTT netDL Configure the OTT netDL IP data logger as described in the oper...

Страница 15: ...Sutron XLINK 100 500 data logger as shown in Fig 7 left Also follow the operating instructions of the Sutron XLINK 100 500 Configure the Sutron XLINK 100 500 data logger as described in the operating...

Страница 16: ...on see Chapter 5 4 Connect the OTT PLS 500 to the Sutron SATLINK 3 satellite transmitter as shown in Fig 8 left Also follow the operating instructions of the Sutron SATLINK 3 Configure the Sutron SATL...

Страница 17: ...measurement This configuration is carried out via the OTT USB SDI 12 Adapter interface con verter toghether with the OTT SDI 12 Interface PC software optionally via the SDI 12 or RS 485 interface In a...

Страница 18: ...nging the factory configuration of an OTT PLS 500 via SDI 12 commands using the OTT USB SDI 12 Adapter 1 2 3 4 5 6 7 OTT USB SDI 12 Adapter USB connection cable OTT PLS 500 SDI 12 GND RS 485 A RS 485...

Страница 19: ...ment including statistical values and request CRC 1 aC Start concurrent measurement 2 aC1 Start concurrent measurement 2 including statistical values aCC Start concurrent measurement 2 and request CRC...

Страница 20: ...ation pbbb pbbb value5 temperature value of pressure sensor pbb ee C pbb ee C value6 temperature of internal humidity sensor pbb ee C pbb ee C value7 pressure value of pressure sensor pbbbb ee mbar pb...

Страница 21: ...2_001 aIM2_009 Query meta data for measured value 1 to 9 measured value in aD0 aD2 after aM2 aIMC_001 aIMC_003 1 aMC aIMC1_001 aIMC1_008 aMC1 aIMC2_001 aIMC2_009 aMC2 aIC_001 aIC_003 1 aC aIC1_001 aIC...

Страница 22: ...mode aXXC Read measuring mode Factory setting 0 Measuring mode single measurement aXAB value Set offset value for level depth measurements aXAB Read offset value Factory setting 0 000 m aXAC value Se...

Страница 23: ...ative humidity in the probe housing measured value format pbb rH value2 dew point in the probe housing measured value format pbb ee C value3 current sensor orientation measured value format pbbb aD1 a...

Страница 24: ...mperature outside the calibrated range 4 values 128 exclusively for internal service purposes aM atttn CR LF and after 0 1 60 seconds a CR LF Start measurement including device status a sensor address...

Страница 25: ...Start concurrent measurement simultaneous measurement with multiple sensors on one single bus line for details see command aM The number of measured values in the response to this command has two dig...

Страница 26: ...l pressure within the averaging time 2 3 aD2 a value7 value8 CR LF Send data after aM1 a sensor address value7 standard deviation of measured values level pressure within the averaging time 2 3 value8...

Страница 27: ...LF Send data after aM2 a sensor address value1 relative humidity in the probe housing measured value format pbb ee rH value2 dew point in the probe housing measured value format pbb ee C value3 curren...

Страница 28: ...e command aD0 aD2 after aM2 Requires measurement type continuous measurement extended command aXXC value aHA atttnnn CR LF Start High volume measurement in ASCII format and request CRC Cyclic Redundan...

Страница 29: ...rating table are not sufficient for calculation aHB atttnnn CR LF Start High volume measurement in binary format and request CRC Cyclic Redundancy Check a sensor address ttt time in seconds until the...

Страница 30: ...1 aICC1_00X 2 aICC2_00X 3 aIHA_00X 4 aIHB_00X 4 aIV_00X 3 a field1 field2 field3 CRC CR LF The OTT PLS 500 sends meta data for the related measured value valueX 5 in the form of three data fields Thes...

Страница 31: ...Min pressure level1 Max pressure level1 Median pressure level1 Standard deviation pressure level1 High accuracy temperature Inside humidity Inside dew point Inside temperature Current orientation Sto...

Страница 32: ...alue CR LF a value CR LF Set unit Read unit a sensor address value 0 C 1 F 2 K Factory setting C or F1 Set read the unit of measured discharge values aXSD value aXSD a value CR LF a value CR LF Set un...

Страница 33: ...9 80659 m s2 results Note The OTT PLS 500 is preset to an average value for Germany Kassel The measured value deviation caused by gravitation al acceleration is 3 mm in Germany Flensburg Oberst dorf T...

Страница 34: ...aging time This mea surement type is available in parallel on the SDI 12 and RS 485 interfaces Continuous measurement interval mode In interval mode single measurements take place continuously one aft...

Страница 35: ...Mean value Mean value Mean value Mean value Mean value Set read offset for level measurement aXAB value aXAB attt1 CR LF Set offset value Read offset value a sensor address value pbbbb eee 1 Input out...

Страница 36: ...esult in rounding errors of 0 001 If the unit of level measurement is set to pressure values aXSU value a measurement is already active or an error has occured the OTT PLS 500 does not respond Reset r...

Страница 37: ...e 0 gradient of the rating curve p constant which numerically corresponds to discharge at h e 1 Create table entry in rating table calculation method rating table aXDA value1 value2 a value1 value2 CR...

Страница 38: ...thod rating table activated Read coefficient exponential formula calculation method according to Standard ISO 1100 2 aXDR a value1 value2 value3 CR LF Read coefficient a sensor address value1 factor e...

Страница 39: ...14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 16 bit Integer values int range 32767 32767 uint range 0 65534 bitfield16 range 0 0x7FFF int range 214483647 214483647 uint range 0 4294967294 float32 range see IEE...

Страница 40: ...Reference system units 14 13 uint 16 1 R 0x001 SHEF 0x002 OTT Number of channels 15 14 uint 16 1 R 1 40 Number of sensor channels 13 Channel 1 definition of physical element 16 15 uint 16 1 R Mean va...

Страница 41: ...annel 4 unit string 33 32 uint 16 3 R compare Channel1 unit string Channel 5 definition of physical element 36 35 uint 16 1 R Maximum level or pressure value HA Height of reading 0x4841 HB Depth of re...

Страница 42: ...nnel1 unit string Channel 9 definition of physical element 56 55 uint 16 1 R relative humidity in the probe housing XR Humidity relative 0x5852 Channel 9 unit 57 56 uint 16 1 R 0x0010 Channel 9 unit s...

Страница 43: ...ubic feet per second ft3 s Channel 14 unit string 83 82 uint 16 3 R compare Channel1 unit string Register name Register number 1 Data type Length Access mode min max Description Channel 1 101 100 floa...

Страница 44: ...ber 1 Data type Length Access mode Description Unit level pressure 201 200 uint 16 1 R W Setting unit for level pressure Unit temperature 202 201 uint 16 1 R W Setting unit for temperature Unit discha...

Страница 45: ...e rating table empty entries are marked by the value 9999 in the format float32 Register name Register number1 Data type Length Access mode Description Factor e of the exponential formula 251 250 floa...

Страница 46: ...used Check replace desiccant of the humidity absorber Required replacement parts Dry desiccant cartridge for replacement color indicator orange For procedure see separate OTT FAD 4 and OTT FAD 6 assem...

Страница 47: ...Remove the black protective cap Clean the measuring cell carefully using a brush hard bristles Lime scale deposits can be removed using a common household scale remover Rinse the pressure probe thoro...

Страница 48: ...r carefully see Chapter 9 Carrying out maintenance work Installation of the sensor steady e g movement from swell Control option Perform system test of the OTT PLS 500 with aV and retrieve result with...

Страница 49: ...thin the member countries of the European Union In accordance with the European Union guideline 2012 19 EC OTT takes back old devices within the member countries of the European Union and disposes of...

Страница 50: ...Variant 2 0 20 m 66 ft WC 0 2 bar 12 bar Variant 3 0 40 m 131 WC 0 4 bar 16 7 bar Variant 4 0 100 m 328 ft WC 0 10 bar 26 7 bar Pressure sensor ceramic Al2O3 99 9 capacitive Temperature compensated op...

Страница 51: ...Pressure probe housing POM stainless steel 1 4539 904 L resistant to sea water Cable jacket PUR Seals Viton Separating membrane ceramic Al2 O3 Type of protection IP 68 Installation Minimum bending rad...

Страница 52: ...ause injuries to the fingers or hands Wear protective gloves when trimming the pressure sensor cable Shorten pressure probe cable by desired length Strip pressure probe cable with OTT stripping tool F...

Страница 53: ...lers Strain relief 100 5 15 1 3 0 5 1 Cable sheath Pressure probe cable Pressure compensation capillary Cable shield all measures in mm 0 5 Fig A1 Dimensions of the OTT PLS 500 pressure probe cable pi...

Страница 54: ...Annex B Note on Declaration of Conformity If necessary you can download the current version of the Declaration of Confor mity for the OTT PLS 500 as pdf file from our website www ott com resources 54...

Страница 55: ...55...

Страница 56: ...Document number 63 039 001 B E 03 0822 OTT HydroMet GmbH Ludwigstrasse 16 87437 Kempten Germany Telephone 49 831 5617 0 Fax 49 831 5617 209 euinfo otthydromet com www otthydromet com...

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