RickGilbert
Member
- Join Date
- May 2005
- Posts
- 7
Hello,
Currently I'm working with WinTRiLogI version 3.5 to devlop the plc ladder logic and have encountered a particular problem I need help with.
Specifically, I need to develop the ladder logic for two Passive Infrared motion detectors that will work as follows:
Scenario #1. Motion detector A is tripped, then B is tripped indicating a person is moving into the room. For his scenario, it is desired to activate a flashing alert light with the plc.
Scenario #2. Motion detector B is tripped first then A is tripped indicating a person is leaving the room. For this scenario, I need to disable the output of my plc to the flashing alert light.
My motion detectors operate off of a N.C. contact as their output (input to the plc) That is to say the relay contacts will open when motion is detected or power is lost.
It is very simple in theory, however I'm at a loss on how to incorporate the differences between scenaraios 1&2 into a ladder logic diagram????.
Any ideas?
Any and all help is greatly appreciated.
Currently I'm working with WinTRiLogI version 3.5 to devlop the plc ladder logic and have encountered a particular problem I need help with.
Specifically, I need to develop the ladder logic for two Passive Infrared motion detectors that will work as follows:
Scenario #1. Motion detector A is tripped, then B is tripped indicating a person is moving into the room. For his scenario, it is desired to activate a flashing alert light with the plc.
Scenario #2. Motion detector B is tripped first then A is tripped indicating a person is leaving the room. For this scenario, I need to disable the output of my plc to the flashing alert light.
My motion detectors operate off of a N.C. contact as their output (input to the plc) That is to say the relay contacts will open when motion is detected or power is lost.
It is very simple in theory, however I'm at a loss on how to incorporate the differences between scenaraios 1&2 into a ladder logic diagram????.
Any ideas?
Any and all help is greatly appreciated.