2.5 KNX BUS RESET FUNCTION
During a bus reset, the device disconnects the entire bus line from the supplying output and induces a
short circuit for 20 seconds. LED 6 (KNX Bus Reset) lights up red and goes off a er the reset process is
accomplished. Other LEDs are off. The devices connected to the bus line restart during the reset process.
Bus Reset and Device Startup:
џ
Reset by push-button:
The Reset Button activates the KNX Bus Reset function. Press the Reset Button on top of the device to
reset the KNX bus line.
џ
Reset by object:
A remote reset can be triggered by communication object no. 16.
џ
Reset by disconnection:
Removing the KNX bus terminals disconnects the entire bus line.
џ
ETS programming:
When there was a mains power outage or a er an ETS download, the
PS-640.30.1
counts a device
startup.
A
«
KNX Bus Reset
»
is triggered a er a reset by button press and a er a reset by communication object. A
«
Device Startup
»
takes place when there was a mains power outage or a er programming the device. The
number of
«
Short circuits
»
is counted only by the counter that can be read out with communication
object no.36
«
Power supply is on
»
.
CO Counter Readout
KNX BUS Reset
Device Startups
Short Circuit
CO no.36
«
Power supply on
»
X
X
X
CO no.17
«
Number of restarts
»
X
CO no.20
«
Number of startups
»
X
Reset by button press
Reset by object
Mains power outage
ETS programming
Short circuits
Table 1.
Event counter readout by communication objects
The total number KNX Bus Resets, Device Startups and Short Circuits of can be read out by CO no.36. The
counters for KNX Bus Resets and Device Startups can be read out by COs no.17 and no.20. For example:
When there was no reset or startup and CO no.36 sends an info telegram on the bus to report an event,
this event was a short circuit.
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