Honeywell Silent Knight IFP-2000 Module 3 Installation Manual page 59

4 Wire Smoke Class B Wiring 4 Wire Smoke Class B Wiring
Up to four Class B 4-wire smoke detector loops
can be connected to the control panel at once
Each Class B loop input is paired with a unique
power source
Each loop gets smoke
power from the even power from the even
numbered Flexput™
circuit
Contact input is
connected to the odd
numbered Flexput™
circuit
Flexput™ I/O Circuits Flexput ™ I/O Circuits