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Appendix VII
Bus Termination
Power Demands
The maximum number of devices that can be connected to a bus line depends on their
current consumption and the respective application conditions. When operating in an
area where there is no risk of explosion, the couplers/links can feed up to 400 mA into the
bus.
When operating in explosion risk areas, the intrinsic safety is only guaranteed when the
maximum power fed into the bus does not exceed certain voltage and current values.
These are normally:
Current I
S
< 128 mA, voltage U
0
< 15 V
The number of devices which can be connected to a bus line is determined by finding
the combined maximum current consumption of all the connected devices (10 mA for
the SITRANS LR 300). Plan to allow a current reserve for safety.
Cyclic versus Acyclic Data
When you request data from a device via Profibus PA, you have two choices. Cyclic data
is provided at every bus scan: acyclic data is requested and provided as needed.
Input and output information is always requested at every bus scan and is set up as cyclic
data. Configuration information is only needed periodically and is set up as acyclic data.
Cyclic Data
When you configure the SITRANS LR 300 on the Profibus PA bus, there are 4 slots
available for modules.
Slot 0 always transmits Level information; slot 1 always Space information; slot 2 always
Distance information, and slot 3 always Volume information. If you do not wish to have
data transmitted, then you must use a Free Place module in that slot.
WARNING: Profibus PA MUST be terminated at both extreme ends
of the cable for it to work properly. Please refer to the Profibus PA
User and Installation Guidelines (order number 2.092), available
from www.profibus.com
WARNING: Only certified supply units (DP/PA couplers or DP/PA
links) may be used to feed the intrinsically safe PROFIBUS. See the
EC Type Examination Certificate for requirements.
Note: Each of the slots has to have a module defined in it.
SITRANS LR 300.book Page 115 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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