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11.7 PROFIBUS protocol
11.7.1 Telegram Format for the Profibus Protocol
For data transmission via PROFIBUS following telegram
formats are relevant for the data logger COMBILOG 1020:
Formats with fixed information section length without data
field:
S D 1 F C SD A S A F C E D
Formats with variable information section length with data
field:
SD2 LE DataUnit FCSLEr DA SA FC EDSD2
Formats with fixed information section length with data field:
SD3 DataUnit FCSDA SA FC ED
With PROFIBUS the various telegram formats are differenti-
ated by varying Start-Delimiters (SD). They can also be called
SD1-, SD2- or SD3-telegrams in this context. The telegram
formats are valid both for request and response telegrams.
However, a request telegram does not necessarily have to be
followed by a response telegram of the same format. In addi-
tion to that there is a telegram which consists of one character
only and which is used as either positive or negative acknow-
ledgement, according to the kind of request.
Short acknowledgement:
S C
Hardware Manual COMBILOG 1022
117
- COMBILOG 1022 1
- Issue: 22.01.2010 2
- CHAPTER SURVEY 5
- TABLE OF CONTENTS 6
- GENERAL PRELIMINARY REMARKS 10
- 1.3 Contact for Inquiries 11
- SYSTEM DESCRIPTION 12
- 2.2 Range of Application 13
- 2.3 Features 15
- 2.4 Configuration Software 17
- INSTALLATION 19
- 3.3 Ambient Temperature 20
- Description of the parts: 21
- Pin assignment: 21
- 3.5 Connection 22
- 3.6 Power Supply 23
- 3.7 Bus Connection 25
- 3.8 Sensor Connection 26
- 3.10 Module Jack 27
- SIGNAL PROCESSING 29
- 4.3 Power Switch 30
- Correction 31
- 4.5 Internal Processing 32
- 4.7 Signal Processing 34
- FUNCTIONAL DESCRIPTION 35
- 5.1 Analogue Input Channel 36
- 5.1.1 Voltage Measurement 37
- Voltage Measurement 38
- 5.1.2 Current Measurement 39
- Current Measurement 40
- 5.1.3 Resistance Measurement 41
- Resistance Measurement 42
- 5.2 Digital Input Channel 46
- Signal diagram: 47
- -> 0) is counted 48
- Anschlussschema Schaltung 49
- + 10V .. 30V 49
- -> 0) oc 50
- 5.3 Digital Output Channel 51
- 5.3.1 Digital Status Output 51
- 5.4 Arithmetic Channel 53
- Arithmetic Operators 56
- 5.5 Setpoint Channel 59
- 5.6 Alarm Channel 59
- 5.7 Serial Channel 59
- 5.8 Threshold Values 59
- 5.9 Error Handling 60
- DISPLAY / MENU OPERATION 61
- Main menu 62
- Configuration menu 63
- LED Display 66
- Network settings 69
- Channels settings 70
- Setting of the date and time 72
- Change + 73
- Change 73
- 6.3.2 Firmware Update 74
- 6.3.1 Remove Card 74
- DATA STORAGE 75
- 7.3 Storage Medium 76
- 7.4 Internal Data Storage 77
- MASTER FUNCTION 82
- INITIATION AND TEST 85
- ● 2400 Bit/s 87
- ● 4800 Bit/s 87
- ● 9600 Bit/s 87
- ● 19200 Bit/s 87
- ● 38400 Bit/s 87
- 10.1 Bus Interface 88
- 10.2 Bus Structure 89
- 10.4 Bus Cable 91
- 10.5 Bus Plug 92
- 10.6 Bus Termination 93
- 10.7 Shielding 95
- 10.8 PC Bus Connection 96
- 10.9 Potential Equalization 97
- COMMUNICATION 100
- 11.3 Data Format 101
- 11.4 Output Format 102
- Transmission in ASCII-format: 103
- Hardware Manual COMBILOG 1022 104
- 11.5 Transmission Sequence 105
- 11.6 ASCII protocol 107
- Byte: 1 2 … 7 8 113
- Byte: 9 10 11 12 113
- 11.7 PROFIBUS protocol 117
- PROFIBUS - layer 2 commands 123
- PROFIBUS - DP commands 124
- 11.8 MODBUS protocol 129
- 11.9 Sample Program 141
- 11.10 Autocall Function 142
- 11.11 Modem Connection 144
- WEBSERVER 145
- 12.5 Data Logger 146
- 12.6 Configuration / Login 146
- 12.8 Power Switch 146
- 12.9 Serial Channel 146
- 12.10 Logger Configuration 147
- 12.11 Password 147
- 12.12 Protocol 147
- 12.13 Logout 147
- SPECIFICATIONS 148
- ±625 mV / ±100 mV / ±25 mV / 149
- ±6.25 mV 149
- 13.6 Interfaces 150
- 38,400 bps 151
- SD Card interface 151
- 13.7 Operating Conditions 152
- 13.9 Shell 153
- 13.10 Circuit 153
- SIMPLIFIED DRAWINGS 155
- APPENDIX 156
- 157
- Th. Friedrichs (Examples) 158
- Th. Friedrichs (Examples)) 160
- 0 00066 1 0 00115. * . * 168
- VP SVP HT C SP TT HT 169
- COMBILOG.EXE 173
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