Siemens SIMATIC NET PROFIBUS Instrukcja Obsługi Strona 73
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Description of the DP Functions, Data, and Error Codes
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-01
73
4.1.5 DP_get_pointer
Purpose
With this function, a DP user program obtains the exclusive pointer to the process
data of the CP 5613/CP 5614. Using this pointer, the DP user program can then
access the data image of the CP 5613/CP 5614.
General Notes
Note 1
Only one program can be in possession of a pointer to the process image at any
one time. This prevents conflicts accessin
g
the re
g
isters for controllin
g
consistenc
y
in the process image (for example, refer toD_lock_in_slave_adr in Section 4.3.1).
Note 2
Note that access to the dual-port RAM without a valid pointer leads to an access
violation in Windows NT. The reason for this is as follows: The DP_get_pointer
was not called, the DP_get_pointer is terminated with an error message or the
pointer was released again with DP_release_pointer.
Note 3
This function requires a relatively long run-time and if it is called often, can be
detrimental to the real-time properties of your user program.
Note 4
The CP must already have been started with DP_start_cp.
- SIMATIC NET 1
- DP Base Programming Interface 1
- Purpose of the Manual 3
- Validity of the Manual 3
- Guide to the Manual 3
- Contents 5
- Procedure 10
- Overview of PROFIBUS DP 13
- The Advantages of DP 15
- Distributed I/Os 16
- Node Classes 16
- DP Master Class 1 16
- DP Master Class 2 16
- DP Slave 17
- Output Data 18
- Input Data 18
- DP application 20
- Initialization 21
- Parameter Assignment 21
- Configuration 21
- State of the Slave 21
- Diagnostics 22
- 2.6 Modes of the DP Master 23
- Setting the Operating Mode 24
- 2.8 Reliability of DP 27
- Purpose of Control Frames 28
- Creating Groups 28
- Control Commands 29
- 2.10 Typical Sequences in DP 30
- Receiving Diagnostic Data 31
- DP/DPC1 prog 32
- DP-V1 Master Class 2 (DPC2) 33
- 3.1 Functions and Data 38
- Using the DP Database 40
- Configuring Slave Data Areas 40
- Activating the Watchdog 40
- The Read Consistency Option 42
- Reducing Load on the PC CPU 43
- Possible Hardware Events 43
- 3.5 Fast Logic 44
- Properties of Hardware Events 45
- Properties of Software Events 45
- 3.7 Typical Sequences 47
- Shutdown Sequence 48
- Elements of a Polling Cycle 50
- Initializing the Semaphores 53
- Using Hardware Events 54
- Clearing the Semaphores 55
- Using Semaphores for DPC1 56
- Clearing a Semaphore 57
- Software) 58
- Productive Operation 59
- Polling Productive Operation 61
- Initializing the Semaphore 62
- Clearing the Semaphore 63
- Multiple CP Operation 64
- Multiple Application Programs 64
- Multiple CPUs in one PC 64
- Error Codes 65
- Conventions in the Text 66
- Header Files 67
- Auxiliary Functions 69
- Fast Logic 69
- 4.1.2 DP_start_cp 70
- 4.1.3 DP_reset_cp 71
- 4.1.4 DP_open 72
- 4.1.5 DP_get_pointer 73
- 4.1.6 DP_release_pointer 75
- 4.1.7 DP_close 76
- 4.1.8 DP_get_err_txt 78
- 4.1.9 DP_set_mode 79
- 4.1.10 DP_slv_state 81
- 4.1.11 DP_read_slv_par 83
- 4.1.12 DP_global_ctrl 85
- 4.1.13 DP_ds_read 87
- 4.1.14 DP_ds_write 90
- 4.1.15 DP_read_alarm 93
- 4.1.16 DP_alarm_ack 96
- 4.1.17 DP_get_actual_cfg 99
- Parameters 100
- Return Value 101
- 4.1.18 DP_enable_event 102
- C79000-G8976-C108-01 103
- Table continued on next page 105
- 4.1.19 DP_disable_event 107
- 4.1.20 DP_get_result 108
- 4.1.21 DP_get_cref 111
- 4.1.22 DP_init_sema_object 112
- 4.1.23 DP_delete_sema_object 114
- 4.1.24 DP_fast_logic_on 115
- 4.1.25 DP_fast_logic_off 116
- Administrative Functions 118
- Initialization Functions 118
- Standard DP Functions 119
- 4.2.2 DPS_open 120
- 4.2.3 DPS_close 124
- 4.2.4 DPS_start 125
- 4.2.5 DPS_stop 126
- 4.2.6 DPS_get_baud_rate 127
- 4.2.7 DPS_get_gc_command 129
- 4.2.8 DPS_get_state 131
- 4.2.9 DPS_set_diag 133
- 4.2.10 DPS_get_ind 135
- 4.2.11 DPS_set_resp 140
- 4.2.12 DPS_calc_io_data_len 142
- Overview of the Existing Data 143
- Consistent Reading 144
- Example of Consistent Reading 144
- Reading without Consistency 145
- General Notes 147
- Writing is always consistent 148
- Example of Consistent Writing 149
- Uses of the Slave State 152
- Overview 159
- Example of Access 159
- Example of Activation 162
- Example of Deactivation 163
- 4.4 Error Codes 167
- Meaning of the Errors 170
- Description 171
- Error_Decode = DP V1 172
- Error_Code_1 173
- Order of the Slave Data 175
- Format of Data Words 175
- Explanation 176
- Possible Length 177
- Byte 1 (Stationstatus_1) 179
- Byte 2 (Stationstatus_2) 180
- Byte 3 (Stationstatus_3) 180
- Byte 4 (Diag. Master_Add ) 180
- Bytes 5 and 6 (Ident_Number) 181
- Structure 182
- Byte 1 (Header Byte) 182
- Extensions) 183
- Byte 2 (Alarm_Type Variant) 184
- Byte 2 (Status_Type Variant) 184
- Byte 3 (Slot Number Variant) 184
- Byte 5-63 186
- Content of the Data Field 188
- Channel Number 190
- Type of Diagnostics 191
- Definition 193
- Byte Structure 194
- Slave Type 195
- Alarm_Mode 196
- Add_Sl_Flag 196
- Byte 1 (Station_status) 198
- Byte 7 (Group_Ident) 199
- Byte 8 (DPV1_Status_1) 199
- Byte 9 (DPV1_Status_2) 200
- Bytes 11 to n 201
- Overview of the Structure 202
- Structure of an ID Byte 203
- Length Bytes 204
- CP 5613/CP 5614? 207
- Where to Get Help 217
- Documentation 218
- Who to Contact 218
- Common Questions 218
- SIMATIC Training Center 221
- Glossary 227
- User watchdog 237
- Watchdog 237
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