Issue:
Requirement of coaxial shielded cable when using Safe Torque Off (STO) function.

Resolution:

Yes, the use of coaxial shielded cable is mandatory due to safety regulations.

Explanation:

When STO is used without signal redundancy (i.e., only one safety channel), a coaxial shielded cable is required to meet SIL2 safety standards. This is because:

• In the event of cable damage, the shielded cable ensures the signal drops to 0, preventing unsafe conditions.
• Coaxial shielding prevents interference or unintended potential from other cables in the same conduit.
• Without shielding, a crushed cable may not be detected, leading to failure in initiating a safety stop.

Therefore, using a coaxial shielded cable is essential to achieve the required safety level and avoid potential hazards in the system.

If this article does not answer your question, check out our FAQ database that has answers to more commonly asked questions:

Frequently Asked Questions - Schneider Electric (se.com)

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Released for: Schneider Electric USA