2-2b. CCTV with relay - Event Handler (practice)

System configuration

Exercise

CCTV Control:

• Pressing the call button at the Entrance or at the Gate 2 should generate a call in private ringing mode to the Guard.
• A relay output to the CCTV system should be activated when the private ringing starts. There is one relay for each substation.
• The relay should stay activate until the call is accepted and the conversation is cancelled. (If the call is not answered, the relay must drop when the ringing times out).

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• 2-2b. CCTV with relay - Event Handler (solution)