1328 Azalea Garden Rd.
Norfolk VA. 23502
757-855-6006
Fax: 757-855-3761

Date: Oct 5, 2000

Contact: Customer Service (service [at] bauercomp [dot] com)

This information bulletin affects - Nitrogen Control Units NCU1/ NCU2/ NCU4 using Micro 190 + PLC's

The Following procedure should be followed in order to refresh / update the program in the NCU plc.

Tools required: Standard PC keyboard ( not PS2 style)

• Remove the upper rear cabinet back panel and plug the standard keyboard into the keyboard connector on the motherboard. ( located next to the power plug connectors)
• Power the NCU and let the system boot to the normal NCU main screen.
• Press and hold the Ctrl key and then press the Break key (Ctrl + Break) to halt the NCU main program and receive the "press any key to return to system" message. Press any key and the type CLS followed by the enter key to clear the screen. At this time one should see only the "C prompt" c:\>
• We can know check the link to the PLC by running the establish link program by typing est_lnk followed by the enter key. This program should respond with the statement
  " the eagle has been found on comm:2 @ 4800 baud
  the program found inside was called NCU#_**"
  The actual name of your program will with the # being 1,2 or 4 depending on the number of channels on your controller and the ## reflecting the program version. If the program responds with
  " cannot locate PLC"
  Check to make sure the PLC is powered up and that the communication cable is connected.
• Change to the Eagle programming subdirectory by typing "cd\eagle" and pressing the enter key. The dos prompt on the screen should now be c:\eagle>.
• Start the srl software by typing "srl ncu#_**" followed by the enter key. Note that the "ncu#_**" should be replaced by the actual program name given by the est_lnk program. For Example an 2 channel NCU running version a of the 1999 program would have a file name "NCU2_99a". If the est_lnk program does not report a program name, then one can obtain a directory of the programs available on the PC by typing "dir *.srl" followed by the enter key.
• With the srl program started, you will be presented with a list of choices available through the Function keys F1 through F10. Press F7 (configuration) followed by F10 (test communication) to verify a link from the SRL software to the PLC. You will be asked if the PLC in on a network Y/N? so respond with a N for no and the System will then check for a PLC on the preset configuration parameters. (Should be on comm:2 at 4800 Baud as returned by the est_lnk program). After the test communication check has returned with a "communicating", press the ESC key to return to the main menu.
• Start the download process by pressing F4 (download). A box shall appear in the middle of the screen indicating the name of the program that was entered after the "Srl " to start the PLC software (section 6). After pressing the enter key to begin the download process, If the PLC MEM light was NOT flashing, you will be asked if you want to halt the processor. This must be done to download so respond with a "Y" for yes. If the MEM light if flashing on the front of the plc then the processor is already halted so you will not be asked this question. A box will then appear with the question "Keep calibration table in memory?". If the controller was calibrated prior to this process to satisfaction, you can answer "Y" to this question. If you are planning to recalibrate after the download, (see Calibrating Your Controller) then answer "N". You will then see a Percentage of download complete progression followed a prompt to restart the processor. After this is done you can exit out of the SRL program by pressing the ESC key and the press the reset button on the front of the controller.
• Remove the keyboard from the motherboard and replace the back panel.

Note: during the download process, all the active setpoints will be cleared so after the system has rebooted, you will have to reload the setpoints for the controller from the upper module.