Error starting ARsim - no valid signature ar000.exe

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1

With AS6.5.3.11 I have that problem that B&R Automation studio only build the ArSim directory ok.

Here ok

02-07-2026 12:28:39 - COPYRIGHT (C) B&R Industrial Automation GmbH
02-07-2026 12:28:39 - No ARsim registration found!
02-07-2026 12:28:39 - InstanceName: 0000001c8db014e5
02-07-2026 12:28:39 - WorkingDirectory: D:\Ersa\SPS\KE.ON\Net10Update\PLC\Machine\Temp\Simulation\Testrack_Orange\5APC2200_AL04_000
02-07-2026 12:28:39 - COMMAND_COLDSTART
02-07-2026 12:28:42 - Version: 6.7.6
02-07-2026 12:28:42 - Build: 1
02-07-2026 12:28:44 - COMMAND_TERMINATE
02-07-2026 12:28:44 - COMMAND_COLDSTART
02-07-2026 12:28:46 - Version: 6.7.6
02-07-2026 12:28:46 - Build: 1
02-07-2026 12:33:20 - COMMAND_TERMINATE

Here not ok

02-07-2026 12:33:22 - COPYRIGHT (C) B&R Industrial Automation GmbH
02-07-2026 12:33:22 - No ARsim registration found!
02-07-2026 12:33:22 - InstanceName: 0000001d363d07c1
02-07-2026 12:33:22 - WorkingDirectory: D:\Ersa\SPS\KE.ON\Net10Update\PLC\Machine\Temp\Simulation\Testrack_Orange\5APC2200_AL04_000
02-07-2026 12:33:22 - COMMAND_COLDSTART
02-07-2026 12:33:22 - Error starting ARsim - no valid signature ar000.exe

If I look in the folder I miss for example the file ar000.exe.

Firewall switch off

Virus protection switch off

With older version AS6 I have not this problem.

Can somebody help or have the same issue.

Best regards JĆ¼rgen

2

Hi @Jurgen_Weber ,
R&D is working on that. We can only propose this step in case you(we, I have the same issue) face again that issue: ā€œDelete the ArSim Temp folder or to perform another Offline Installationā€

Ciao
Valerio

3

Or simply reinstall the ARsim (Alt+F8). In my case, that usually helped.

4

Thank you.

I can work at the moment. But no solution for all time. I wait then for solution from B&R

5

I mark the solution, the answer I gave to you and Iā€™ll update the post once Iā€™ll receive the fix.

Ciao
Valerio