HS0001 PDF

A permissive is needed to get a piece of equipment going, an interlock is needed to keep it going. An interlock can also be a permissive, but a permissive is only a permissive. For instance, if I need the level in the tank to be above a certain point to start a pump, it is a permissive, if I also need that level to be above that same point to keep it running, now it has become an interlock. If I need the start button to get it running, it is a permissive, if that button can go away after I start normally , it is just a permissive. The stop button is usually a normally closed button that opens when pressed, so I need it "not pressed" to start and if it goes away I shut down, interlock and permissive so therefor an interlock but when it comes back I do not start until the other "permissives" are satisfied.

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A permissive is needed to get a piece of equipment going, an interlock is needed to keep it going. An interlock can also be a permissive, but a permissive is only a permissive. For instance, if I need the level in the tank to be above a certain point to start a pump, it is a permissive, if I also need that level to be above that same point to keep it running, now it has become an interlock.

If I need the start button to get it running, it is a permissive, if that button can go away after I start normally , it is just a permissive.

The stop button is usually a normally closed button that opens when pressed, so I need it "not pressed" to start and if it goes away I shut down, interlock and permissive so therefor an interlock but when it comes back I do not start until the other "permissives" are satisfied.

If the pressure is low I shut the pump off. If this "interlock to keep running" was also in the permissive code, the pump would not start ever low PSI , instead I would start the pump, wait an amount of time and then engage this "interlock" to keep it running, so in this case the interlock is not also a permissive. Now on the other hand, the tank level above is both a permissive to start and also needed to keep running, so it is both.

The start button is a permissive only. The programming for permissives and interlocks is different and needs to be treated different, for instance say have a string of many things that I FIFO first in first out trap my reasons to see which one shut me down, I would only want to FIFO the interlocks because as soon as you let go of that start button permissive only , it would set the FIFO trap and say "the reason you shut down was the start button", so they are treated as two different things.

I have this discussion many times and there is much confusion on this topic but they are two distinct different items I hope I have not confused you more, hard to explain for me on paper Dave Ferguson.

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Page 10 The 48V switch connects 48 volt phantom power to the input connector which is suitable for a condenser microphone or DI box. Page 12 The configurable group MIX controls 1 to 24 have two functions:- i. Page 13 The PAN defaults to control the channel placement within a group or master The ST switch connects the post fader stereo mix and has a constant power law channel signal to the master stereo bus i. If the switch is pressed for a short time it will latch on or off, but if it is held i. Page 18 The 48V switch connects 48 volt phantom power to both input connectors and is suitable for condenser microphones or DI boxes.

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