Safety Applications
The safety concept assumes the following requirements:
- You are responsible to create, operate, and maintain the safety application.
- You are fully qualified, specially trained, and experienced in safety systems.
- You apply the logic correctly to detect programming errors through strict adherence to specifications, programming, and naming rules.
- You perform a critical analysis of the application and use all possible measures to detect a failure.
- You confirm all application downloads via a manual check of the safety signature.
- You perform a complete functional test of the entire system before the operational startup of a safety-related system. This test includes, but is not limited to, the following:
- Validate that the overall functionality of the implemented safety functions, including I/O configuration via Add-On Profiles, beyond the limits of the individual devices (boundary testing).
- Verify that the correct versions of software are used.
Controller Mode | Controller Safety Execution |
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Program |
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Test |
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Run |
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Unlocked no signature | Only for development purposes |
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Locked no signature | Only for development purposes |
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Unlocked with signature | SIL 2/SIL 3 (per controller) |
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Locked with signature | SIL 2/SIL 3 (per controller) |
IMPORTANT:
If the controller is safety-locked and the safety-unlock password is lost and a download is needed, you must perform a Stage 1 reset of the controller.
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