Copying Subroutines From The Sample Project - Spectrum Controls 1769sc-IF4IH User Manual

5-6
Compact IO™ Isolated HART Analog Input Module
Section 5.3
Using the
Ladder Sample
User' s Manual 0300215-03 Rev. A
To get started we recommend that you use the provided MicroLogix 1500 sample project.
Refer to Chapter 8 for the sample project or visit our website at
(www.spectrumcontrols.com).
The sample project contains nine different subroutines which are used to perform various
HART related tasks. The following list describes the function of each subroutine within
the project file.
Table 5-1 (Ladder Routines)
Routine
MAIN
PACKETS
MSG_TO_MOD
SRC_CHECK
DEST_CHECKSUM
HART_MSG
WORD_BYTE
HART_CHECK
BYTE_WORD
You have the choice to either use the sample project or copy and past the pieces you need
from the project.

5.3.1 Copying Subroutines from the Sample Project

To copy subroutines from the sample project to your project, follow the steps below:
1. Open the sample project and your project.
2. Select the subroutine you wish to copy.
3. Right mouse click and select copy.
4. Go to your project and select where you would like to place the new routine.
Description
The main routine is the starting point for the ladder
program.
The "packets" routine is used to demultiplex the HART
data from the input file to individual integer files, so that
the data can be viewed or used within the ladder program.
This routine is called from the MAIN routine.
This routine is used to send and receive messages to and
from the module. Refer to Chapter 7 for more details
regarding sending and receiving messages. This routine is
called from the HART_MSG routine.
Calculates the checksum for a message sent to the module
one page at a time. This routine is called from the
MSG_TO_MOD routine.
This routine calculates the checksum for a message
received from the module one page at a time. This routine
is called from the MSG_TO_MOD routine.
This routine composes HART messages that will be sent to
the module/field transmitter. This routine is called from
the MAIN routine.
Converts word data to its byte equivalent. This routine is
called from the HART_MSG routine.
Calculates the checksum for the HART message being sent
to the module/field device. This routine is called from the
HART_MSG routine.
Converts byte data to its word equivalent. This routine is
called by the HART_MSG routine.