Difference between revisions of "2-2b. CCTV with relay - Event Handler (solution)"
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This solution reduces the number of events. Instead of using one event for each substation, one can set the "When Related To" = "All", and use the IF statement to check who is calling. | This solution reduces the number of events. Instead of using one event for each substation, one can set the "When Related To" = "All", and use the IF statement to check who is calling. | ||
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[[File:2-2b solution9.PNG|left|thumb|500px|This event is triggered by calls from any station. The IF statement is used to check who the caller is]] | [[File:2-2b solution9.PNG|left|thumb|500px|This event is triggered by calls from any station. The IF statement is used to check who the caller is]] | ||
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Revision as of 15:05, 20 September 2013
Solution
Call buttons:
- Pressing the call button at the Entrance or at the SOS Point should generate a call in private ringing mode to the Control Room.
Relay control
- A relay output to the CCTV system should be activated when the private ringing starts. There is one relay for each substation. Use the outputs 5 and 6.
- 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).
When the Control Room starts ringing (The Private Ringing mode event goes ON), and the caller is station 107, turn on RCO 5:
When the Control Room starts ringing (The Private Ringing mode event goes ON), and the caller is station 108, turn on RCO 6:
When the conversation with the Entrance ends (or the ringing times out), the station returns to idle mode. Now the event "4 - Station in Use" will go OFF:
When the conversation with the SOS Point ends (or the ringing times out), the station returns to idle mode. Now the event "4 - Station in Use" will go OFF:
Relay control. Alternative solution
This solution reduces the number of events. Instead of using one event for each substation, one can set the "When Related To" = "All", and use the IF statement to check who is calling.
Action string:
IF %op(%2.dir,=,107) RCO 5 ON ENDIF IF %op(%2.dir,=,108) RCO 6 ON ENDIF
When the Control Room station returns to idle, the outputs should go off: