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ControlLogix Platform ♦ "C" Programmable Understanding the MVI56-LDM API
Linux Application Development Module Developer's Manual
ProSoft Technology, Inc. Page 51 of 264
March 12, 2014
4.14 Backplane_Sample
The Backplane Sample program is designed to show block transfer
communication with the ControlLogix controller in slot 0 of the ControlLogix rack.
The ControlLogix controller must be loaded with the sample ladder logic and be
configured to communicate with the MVI56E-LDM module. The ladder is
LDM.ACD.
To use this program, establish a command window using telnet or similar
terminal software on the PC using either the Ethernet or Serial P1 port.
Login as user: root, using password password.
To execute the sample...
From the default home directory (/psft), type the command
./Backplane_Sample&. This will run the Sample program in the background.
While looking at the sample source, you'll see that the main program will....
open a connection to the hardware via the OCX library API using the
open_backplane routine. The open_backplane function will:
o call OCXcip_Open to get access to the LDM hardware and backplane
o change the module identity by reading the identity using
OCXcip_GetIdObject, changing the values of the object Id structure, and
then setting the identity with the OCXcip_SetIdObject routine.
The backplane connection service and service callback routines are then
registered with the backplane driver using the
OCXcip_RegisterAssemblyObj routine.
set each of the front panel LEDs, reads back the state of the LED, and prints
the result to the console:
o OK LED - Module status is set to Solid Green using
OCXcip_SetModuleStatus routine and read back using the
OCXcip_GetModuleStatus routine
o APP LED - the User LED is turned off using the OCXcip_SetUserLED
routine and read back using the OCXcip_GetUserLED routine.
o ERR LED - LED3 is set to off using the OCXcip_SetLED3 routine and read
back using the OCXcip_GetLED3 routine.
read the real-time clock of the ControlLogix process using OCXcip_GetWCTime
and the time is printed to the console
enter a main (infinite loop) and within this loop, the program will:
o wait for a connection to be established by the ControlLogix processor.
The routine Backplane_ConnectProc is started when this occurs. The
routine sets the global variable Backplane_Connected which the main
program loop monitors.
read a block of data (one the connection is established) from the controller
using the OCXcip_ReadConnected API call.
- MVI56E-LDM 1
- Your Feedback Please 2
- Warnings - MVI56E-LDM 2
- Contents 5
- 1 LDM Introduction 10
- In This Chapter 12
- 2.1 System Requirements 12
- 2.2 Package Contents - LDM 13
- 2.4.1 Setup Jumper - MVI56E 14
- telnetd file 20
- 2.8 Module Rescue 27
- 3 Development Environment 29
- 3.2 Using Eclipse 33
- 3.2.1 Building a Project 33
- python createimage.py 36
- 4.1 API Library - MVI56E 39
- 4.1.1 Header File 39
- 4.1.2 Sample Code 39
- 4.3 CIP API Functions 42
- 4.4 Backplane Device Driver 42
- 4.5 Sample Code 44
- 4.10 Sample Tutorials 51
- 4.11 Ethernet Sample 52
- 4.12 Serial Sample 55
- 4.13 Led_Sample 56
- 4.14 Backplane_Sample 57
- 4.15 Tag_Sample 59
- 4.16 Sample Applications 61
- 5 CIP API Functions 76
- OCXcip_Open 79
- OCXcip_OpenNB 80
- OCXcip_Close 83
- 5.2 Object Registration 85
- OCXcip_RegisterAssemblyObj 85
- OCXcip_UnregisterAssemblyObj 88
- OCXcip_RegisterFatalFaultRtn 90
- OCXcip_RegisterResetReqRtn 92
- 5.4 CIP Callback Functions 94
- 5.5 Connected Data Transfer 105
- OCXcip_WriteConnected 105
- OCXcip_ReadConnected 107
- OCXcip_ImmediateOutput 109
- OCXcip_WaitForRxData 111
- 5.6 Tag Access Functions 116
- OCXcip_AccessTagData 116
- OCXcip_CreateTagDbHandle 120
- OCXcip_DeleteTagDbHandle 121
- OCXcip_SetTagDbOptions 122
- OCXcip_BuildTagDb 125
- OCXcip_TestTagDbVer 127
- OCXcip_GetSymbolInfo 129
- OCXcip_GetStructInfo 132
- OCXcip_GetStructMbrInfo 135
- OCXcip_GetTagDbTagInfo 138
- OCXcip_AccessTagDataDb 141
- 5.7 Messaging 144
- OCXcip_GetDeviceIdObject 145
- OCXcip_GetDeviceICPObject 148
- OCXcip_GetDeviceIdStatus 151
- OCXcip_GetExDeviceObject 155
- OCXcip_GetWCTime 158
- OCXcip_SetWCTime 162
- OCXcip_GetWCTimeUTC 165
- OCXcip_SetWCTimeUTC 169
- 5.8 Miscellaneous Functions 172
- OCXcip_GetIdObject 173
- OCXcip_SetIdObject 175
- OCXcip_GetActiveNodeTable 177
- OCXcip_MsgResponse 179
- OCXcip_GetVersionInfo 182
- OCXcip_GetUserLED 184
- OCXcip_SetUserLED 186
- OCXcip_GetModuleStatus 188
- OCXcip_SetModuleStatus 190
- OCXcip_GetLED3 192
- OCXcip_SetLED3 194
- OCXcip_ErrorString 196
- OCXcip_SetDisplay 198
- OCXcip_GetDisplay 200
- OCXcip_GetSwitchPosition 202
- OCXcip_GetSerialConfig 204
- OCXcip_Sleep 207
- OCXcip_CalculateCRC 209
- OCXcip_SetModuleStatusWord 211
- OCXcip_GetModuleStatusWord 213
- 6 Cable Connections 215
- 6.3 RS-422 218
- 6.4.1 RS-485 and RS-422 Tip 219
- 7.2.1 Returning Any Product 221
- 7.3 LIMITED WARRANTY 223
- 7.3.8 No Other Warranties 229
- 7.3.9 Allocation of Risks 229
- 7.4 Open Source Licensing 230
- 7.5 GNU Public License 231
- 7.6 Eclipse Public License 245
- 7.7 Python Public License 251
- 7.8 GCC Public License 257
- 8 Glossary of Terms 260
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