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Basic calculations

Created by: Tron_Guy at: 1/31/2013 10:53 PM (3 Replies)

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1/31/2013 10:53 PM	Rate (0)
Tron_Guy Posts: 7 Rating: (0)	I'm using the TIA Portal for a student project and I need some help getting started. I want to create a program that simulates level control in a liquid tank. The hardware I will be using is the S7-1200 and a 12'' Comfort Panel. Right now I only have access to the TIA Portal and not my hardware, but I want to start working on the program right away. Mathematically, I know exactly what to do. But I'm having trouble implementing the equations in the TIA Portal.To get started I need to be able to make a simple program that works as follows. 1. The user inputs two (or more) integers on the HMI. 2. The program calculates an output value according to some equation. It could be as simple as: output= input1 + input2 3. The output value is displayed on the HMI. Here's what I have done so far: 1. Added my devices and linked them to each other. 2. Made a simple program in Main that contains an int adder with two inputs and an output. 3. Defined global PLC tags for my inputs and outputs of data type int. 4. Added three I/O fields to my root screen, defined HMI tags for all of them, and linked those to the appropriate PLC tags. 5. Hit "online" and "simulate with tags". But when I enter numbers in the input fields nothing happens to the output. What am I doing wrong here?
Tron_Guy Posts: 7 Rating: (0)
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2/1/2013 10:14 AM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 1/13/2026 Posts: 4446 Rating: (1487)	Hi, the main problem is that you simulate the HMI, simulate a communcation with a PLC but doesn't simulate the PLC probram itself. S7-1200 doesn't have simulation features. I suggest, for test propouses, that you change your PLC for a S7-300, start the simulation of it, and start the simulation of the HMI (without tag simulation). So, the HMI simulation will get the tags from the PLC simulation.
	Denilson Pegaia Siemens Industry Sector Technical Support
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2/1/2013 11:41 AM	Rate (0)
Tron_Guy Posts: 7 Rating: (0)	Pegaia Hi, the main problem is that you simulate the HMI, simulate a communcation with a PLC but doesn't simulate the PLC probram itself. S7-1200 doesn't have simulation features. I suggest, for test propouses, that you change your PLC for a S7-300, start the simulation of it, and start the simulation of the HMI (without tag simulation). So, the HMI simulation will get the tags from the PLC simulation. Great! This was exactly what I needed. I got it working now, and I can start building my program. Thanks!
Tron_Guy Posts: 7 Rating: (0)
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2/4/2013 10:34 AM	Rate (0)
Denilson Pegaia Diamond Expert Joined: 9/23/2005 Last visit: 1/13/2026 Posts: 4446 Rating: (1487)	You are Welcome
	Denilson Pegaia Siemens Industry Sector Technical Support
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