Danfoss MCXD Operating guide

Operating Guide

How to add MODBUS coils in MCXD

Summary

Description

How to make the MCXD support MODBUS coils.

Following are the steps to support MODBUS coils with MCXD.

Will be allowed to read a single coil or group of 16 coils per task:

1. Add the functionalities into the "InitDefines.c" file:

//Enable to use Coils for Modbus Slave
#define MODBUS_SUPPORTCOILS
#ifdef MODBUS_SUPPORTCOILS
#define MODBUS_COILS_OFFSET 50000
#endif

2. Add the file "AdditionalCoilTable.c" into the folder... \App

3. Edit "AdditionalCoilTable.c" setting the boolean variables to the coils:
a. For "Alarms": the variables' name are in the column "Variable name" in the tab called "Alarms"

b. For "Digital Input": the variables' name are in the column "Name" in the tab called "Digital

Input"

c. For "Digital Output": the variables' name are in the column "Name" in the tab called "Digital

Output"

d. For "Hot Spot": the variables' name is "MyApp. Hot spot name"

© Danfoss | Climate Solutions | 2021.11

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4. Edit the "main.c" file by adding "TTimer MainLoopTimer"; just before the instruction:

#ifdef MODBUS_SUPPORTCOILS
#include "AdditionalCoilTable.c"
#endif

5. Edit the "main.c" file by adding "IOMng.Run( )"; just before the instruction:

#ifdef MODBUS_SUPPORTCOILS
SetValuesOfCoils( );
#endif

© Danfoss | Climate Solutions | 2021.11

AQ397218417593en-000101 | 2