Prosoft-technology MVI56E-LDM Bedienungsanleitung PDF herunterladen (Seite 59)

ControlLogix Platform ♦ "C" Programmable Understanding the MVI56-LDM API

Linux Application Development Module Developer's Manual

ProSoft Technology, Inc. Page 53 of 264

March 12, 2014

4.15 Tag_Sample

The Tag sample program shows block transfer communication with the

ControlLogix controller in Slot 0 of the ControlLogix rack. The Controller must be

loaded with the sample ladder logic and configured to communicate with the

MVI56E-LDM module. The ladder is LDM.ACD.

To run the Tag sample:

1 Open a command window using telnet or a similar terminal software on the

PC through a serial (P1) or Ethernet port.

2 Login as user: root, password: password.

To execute the sample:

1 From the default home directory /psft, type the command ./Tag_Sample&.

The program runs as a background task.

While looking at the 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:

o OK LED - Module status is set to Solid Green

o APP LED - the User LED is turned off

o ERR LED - LED3 is set to off

 read the series and revision of the API, backplane engine, and device driver

using OCXcip_GetVersionInfo and prints it to the console.

 call print_rack_information to read the size and modules in the current rack

using OCXcip_GetActiveNodeTable and prints to the console. Additionally, this

routine reads detailed information about the controller in Slot 0 using the

OCXcip_GetExDevObject routine and prints the information to the console.

 display "Run" on the LDM front panel using a call to Display.

The program enters a main infinite loop and waits for the ControlLogix controller

to open a connection to the MVI56E-LDM. Once the connection is established:

 the LDM module's status is changed to connected and owned using two calls

to OCXcip_SetModuleStatusWord.

 the rack information is printed to the console again

 the entire tag database is read and printed to the console using

open_tag_dbase.

This routine does the following:

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