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Inst Tools > Blog > PLC Tutorials > Test and Process Modes in Siemens PLC

Test and Process Modes in Siemens PLC

In this article, we will learn about a term test and process modes reside in the TIA PORTAL software of Siemens PLC.

Last updated: March 4, 2021 11:21 am
Editorial Staff
PLC Tutorials
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In this article, we will learn about a term test and process mode reside in the TIA PORTAL software.

Contents
Test and Process ModesTest Mode:Process Mode:

These two options you may find in some PLC and not in every PLC. It depends on the type of PLC you choose.

Test and Process Modes

Let’s find out where these functions are residing in the PLC software.

Open TIA PORTAL. Go to “Device and Network”.

Siemens PLC Device and Network

Now, select the CPU and go to the “properties tab”. This is a safety CPU which contains operating mode.

Here, in the “general” tab section you can find “operating mode” as you can see in the below window.

Siemens Test Mode

Inside operating mode, you can find two options

1. Process mode
2. Test mode

Selection by default comes in test mode.

Test Mode:

As you can see in the above window that selection is at by default test mode.

In test mode you can perform test functions means you can modify and monitor variables.

In the test function, you can perform every function without any restrictions.

But it requires greater scan time. So, if a user program is in test mode then it must have a larger scan time.

In case you find trouble using modify and monitoring that means selection is made to process mode.

Process Mode:

As you can see in the below window that selection is now made to Process mode.

Siemens Process Mode

Here, you can change the cycle time. You can set a cycle time between 5 and 65535 ms.

It restricts modify and monitor function to reduce cycle time.

Step by step programming execution can’t be performed.

No call condition is permitted to make sure that scan time can’t exceed the set cycle time.

It won’t allow changes to be made in the programming environment.

Author: Suhel Patel

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