W
Presently developing URS for 1002D Safety PLC.
Wish to specify type of relays to be used to implement a 2oo3 voted hardwired zone shutdown that will disconnect active power from the relevant digital output termination cards.
A set of 2oo3 voted relay contacts will also be wired into the PLC logic.
I plan to use 3 HIGH RELIABILITY relays with the contacts wired in a 2oo3 configuration. A test pushbutton will be available on each relay to enable all the NC single pole contacts on any one relay to be tested for welding.
Is there a better way of achieving this??
Can anyone suggest suitable relays??
Wish to specify type of relays to be used to implement a 2oo3 voted hardwired zone shutdown that will disconnect active power from the relevant digital output termination cards.
A set of 2oo3 voted relay contacts will also be wired into the PLC logic.
I plan to use 3 HIGH RELIABILITY relays with the contacts wired in a 2oo3 configuration. A test pushbutton will be available on each relay to enable all the NC single pole contacts on any one relay to be tested for welding.
Is there a better way of achieving this??
Can anyone suggest suitable relays??