Figure 21: Emergency stop button connection
There are two types of contact states in Emergency Stop buttons/relays:
Normally open (NO)
– the contacts are open until closed by operation of the
switch. This type of switch should be connected in the following manner:
This installation is safe when L1/L2 has 5V input, and active with L1/L2 is not
connected. This is considered Normal polarity in the configuration screen.
Normally closed (NC)
– the contacts are closed until opened by operation of the
switch. This type of switch should be connected in the following manner:
This installation is safe when L1/L2 is not connected and active when L1/L2 is 5V.
This is considered Reverse polarity in the configuration screen.
If you connect more than one firefighter gateways to the same emergency stop
button, they should connect to the same grounding, as in the following example:
Appendix B: Connecting Emergency Stop Button or Fire Alarm Control
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Firefighter Gateway Installation Guide MAN-01-00113-1.4