sparky64
Member
Might sound like a daft question but.......
We have contractors on site installing some alarm monitoring equipment for boilers, pumps, fans etc.
I've asked them for some digital signals for our plc to monitor and bring on our panelview alarms...etc.
They told me that they would give me an ammount of volt free contacts.
My understanding of this, is that they will use the alarm signals they generate, to energise relays, and i can switch our 24 VDC through their relay contact to give me an inut to our plc, but a colleague is disagreeing with my understanding of this terminology.
He says that no voltage is present at any time on the contact hence "volt free", if this is correct, how can i get my 24VDC signals.
Could someone clarify this for me please.
Cheers
Sparky
We have contractors on site installing some alarm monitoring equipment for boilers, pumps, fans etc.
I've asked them for some digital signals for our plc to monitor and bring on our panelview alarms...etc.
They told me that they would give me an ammount of volt free contacts.
My understanding of this, is that they will use the alarm signals they generate, to energise relays, and i can switch our 24 VDC through their relay contact to give me an inut to our plc, but a colleague is disagreeing with my understanding of this terminology.
He says that no voltage is present at any time on the contact hence "volt free", if this is correct, how can i get my 24VDC signals.
Could someone clarify this for me please.
Cheers
Sparky