1. ABB i-bus® KNX Diagnosis and Protection Module DSM/S 1.1

2. 2 interconnected bus connection terminals (no datarail necessary)
2 modules wide
2 interconnected bus connection terminals (no datarail necessary)
Fast and easy diagnosis of the bus state
Protects devices against interference voltage spikes
2CDC071261F0005

3. U = OK lights up, if bus voltage > ~ 22,5 V
U < Umin lights up, if bus voltage < ~ 20,5 V
Telegram flashes / lights up during telegram traffic
If U < Umin relay contacts are activated as well (changeover contact)

4. Protection
The DSM incorporates a suppressor diode (43 V / 1500 W @ 10/1000µs-pulse), which suppresses transient overvoltages and interference voltage spikes.
It is recommended to apply the device as a “disconnection point” for example between building sections, to provide optimum protection.
The DSM should be used together with an overvoltage protection system.