How to Simulate Modbus Signal with Modscan without Connecting Physical Modbus Device or PLC

 

In this Blog Post I will guide you through on how to Simulate Modbus Signal using ModScan and ModSim  without actually Connecting to a Physical Modbus Device or PLC.

What do you need for this Exercise 

Before getting Started  , you will need to Install  all the Software listed below

• ModScan  / ModSim
• Virtual  Serial Port

After you have downloaded the Software’s lets get started

Note :Modscan will act as Modbus Master while Modsim will act as Modbus Slave Device

Step 1 

Create  Virtual Port

1. Open your  ” Free Virtual Port Software “
2. Select the Available Comm Port which is not in use
3. Click Create Virtual Port

 

 

Step 2 

Setting Up  ModSim

1. Open your  ” ModSim “
2. Go to File -> New

 

3.  Set  Starting  Address as 30 -> Length of Address to Simulate  -> 10 ( From  30030 to 30039 )  Modbus Point Type -> Input Register   Slave Address  -> 20

4. Select Connection to your Virtual Port you have just created in Step 1 , in my Case my Virtual Port is Port 2

4. Make Sure all Comm Settings Are Set Correctly , Click OK if Every thing good

 

Step 3

Setting Up Modscan to Poll Data

1. Open your  ” ModScan “
2. Go to File -> New

3.  Set  Starting  Address as 30 -> Length of Address to Simulate  -> 10 ( From  30030 to 30039 )  Modbus Point Type -> Input Register   Device ID  -> 20 ( slave Device ID)

4. Go to Connection -> Select Connection to your Virtual Port you have just created in Step 1 , in my Case my Virtual Port is Port 1

Check all your Comm Setting , if everything looks good click “Ok”

 

Step 4

Simulate Data

After Modscan and Modsim Connected  , you can now start to Simulate Data

Check out how to build a PLC Motor  Control Panel Here