Siemens SITRANS LR 300 Instruction Manual Page 89
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7ML19985CL02 SITRANS LR 300– INSTRUCTION MANUAL Page 87
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Communications
Communications: Data Types
The SITRANS LR 300 parameters do not always use integers to hold values. For the
convenience of the programmer, those values are converted to and from a 16-bit integer
number. This section describes the conversion process.
Numeric Values
Numeric parameter values are the most common. For example, parameter P920
(Reading) returns a number that represents the current reading (either level or volume,
depending on the IQ-300 configuration).
Numeric values are requested or set in units or percent of span, and may be specified
using a number of decimal places.
Numeric values must be in the range –20,000 to +20,000 to be valid. If a parameter is
requested and its value is more than +20,000, the number 32,767 is returned; if it is less
than –20,000, the number –32,768 is returned. If this overflow happens, decrease the
number of decimal places.
If a parameter cannot be expressed in terms of percent of span, or has no meaningful
value, the number 22,222 is returned. Try requesting the parameter in units, or refer to the
Parameter Description section on page 55 for an explanation of the format and use of the
requested parameter.
Split Values
Certain parameters are actually a pair of numbers separated by a colon, using this
format: xx:yy.
One example is P712 (Echo Lock Sampling) where:
xx = the number of above echoes
yy = the number of below echoes
The number which corresponds to xx:yy, for either reading or setting a parameter, is
determined by the following formula:
For storing to the device:
value = (xx + 128) x 256 + (yy + 128)
For reading from the device:
xx = (value / 256) – 128
yy = (value % 256) – 128
where % is the modulus operator.
The modulus can be computed by following these steps:
value
1
= value / 256
value
2
= remainder of value
1
value
3
= value
2
x 256
yy = value
3
– 128
It may simplify the calculation to note:
xx = (most significant byte of value) – 128
yy = (least significant byte of value) – 128
SITRANS LR 300.book Page 87 Monday, June 10, 2002 7:18 PM
- SITRANS LR 300 1
- Disclaimer of Liability 2
- Table of Contents 3
- General Information 7
- Performance 10
- Mechanical 10
- Approvals on page 10 11
- Specifications 12
- Programmer (remote keypad) 13
- Installation 15
- Beam Spreading 16
- Polarization Effect 16
- False Reflections 16
- Dimensions: Threaded Rod 19
- Dimensions: Shielded Rod 20
- Dimensions: Horn 21
- Dimensions: Waveguide 22
- Dimensions: Sanitary Horn 25
- Dimensions: Sanitary Rod 26
- Dimensions: Flanges 27
- Mounting 29
- Rod Assembly 30
- Rod Extension Requirements 30
- Mounting: Rod Assembly 30
- Mounting: Manhole Covers 31
- Mounting: Waveguide Antenna 32
- Smoothness 33
- Interconnection 35
- SITRANS LR 300 Wiring 36
- Communications Installation 37
- PC Connection 38
- Port Configuration 38
- Start Up 39
- Programming 40
- Hand Programmer 41
- Local Programming 41
- Key Programming Mode Run Mode 42
- Accessing PROGRAM Mode 43
- Accessing a Parameter 43
- Modifying a Parameter Value 44
- Accessing RUN Mode 45
- Quick Start Programming 45
- Operation 47
- Loss of Echo (LOE) 48
- Analog Output 49
- RUN/PROGRAM 50
- Application Examples 51
- Applications 52
- Parameter Enter 52
- Horn Antenna 53
- Digesters 54
- Parameter Descriptions 57
- P001 Operation (F = 3) 58
- P002 Material 58
- P004 Antenna (F = 240) 59
- P005 Units (F = 1) 59
- P006 Empty (F = 10m) 59
- P007 Span (F = 10m) 59
- P050 Tank Shape (F = 0) 60
- (F = – – – –) 63
- P060 Decimal Position (F = 2) 64
- Material Level 65
- Parameters 67
- Related Parameters 67
- P219 mA Output Fail-Safe 68
- P341 Run Time 68
- P342 Power-On Resets 68
- P343 Internal Temperature 69
- P346 Serial Number 69
- P700 Maximum Fill Rate 71
- P701 Maximum Empty Rate 71
- P709 Damping Filter 72
- P711 Echo Lock (F = 2) 72
- P712 Echo Lock Sampling 73
- P770 Serial Protocol (F = 1) 74
- P772 Baud Rate (F = 9.6) 75
- P773 Parity (F = 0) 75
- P774 Data Bits and Stop Bits 75
- P801 Range Extension (F = 5%) 77
- P805 Echo Confidence 77
- P806 Echo Strength 77
- P807 Noise 77
- Algorithm Parameter (P820) 78
- (P830 to P841) 78
- To change a breakpoint: 79
- (or when P837 = 0) 80
- Values (view only) 82
- 0.0000 to 99999 83
- P999 Master Reset 84
- Product ID (R40,064) 85
- Input/Output 86
- Format Word (R43,997) 87
- (R43,998) 88
- Communications: Data Types 89
- Text Messages 90
- Error Handling 91
- Communications 92
- Troubleshooting 93
- Operation Troubleshooting 94
- Maintenance 95
- Appendix I 97
- Appendix II 100
- Number Parameter Name Value 101
- Appendix III 103
- Appendix IV 104
- Appendix V 109
- Appendix VI 110
- HART Communicator 275: 111
- Supported HART Commands: 115
- Appendix VII: Profibus PA 116
- Bus Termination 117
- Power Demands 117
- Cyclic versus Acyclic Data 117
- Cyclic Data 117
- Appendix VII 118
- Status Word 119
- Diagnostics 120
- Acyclic Data 120
- Configuration Example: 120
- Profibus Level Device Design 121
- Transducer Block - Level 122
- Parameter Structure 123
- Linear conversion: 124
- Analog Input Function Block 124
- Device Management 125
- Physical Block 1 126
- Transducer Block 1 127
- Function Block 1 - Level 131
- Function Block 2 - Space 132
- Function Block 3 - Distance 133
- Function Block 4 - Volume 133
- Annex II, 1/0/6) 134
- Appendix VIII 136
- *7ml19985cl02* 140
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