Activate Function; Operating Principle; Troubleshooting - Siemens RMB795B Basic Documentation

Configuration
Bus telegram to the
individual room
controllers
Note
Application example
Priority is urgent
Fault status messages
80 / 144
Siemens
Building Technologies

8.10.1 Activate function

The function is activated by configuring a digital input:
Main menu > Commissioning > Extra configuration > Room group 1...10 > Fire and smoke
extraction >
Operating line
Fire alarm off

8.10.2 Operating principle

When individual room controllers are used on applications that support the
"Emergency override" function, the RMB795B central control unit can transmit to
them via bus the signal for fire alarm off received via the digital input.
The signal acts on the geographical zone of the relevant room group. It has no
impact on the operating mode of that room group.
For detailed information about the RXB/RXL room controllers that support the
"Emergency override" function, refer to the relevant RXB/RXL documentation.
The signal at digital input X4 is forwarded to the inputs "Fire alarm off" of two room
groups:
N.X1 N.X2 N.X3
Digital
x Y x Y x Y
x x x x x x x x
SA EA
Enable
Setpoint prio
Relay
1 2
Q Q

8.10.3 Troubleshooting

Fault priority is always "urgent". A fire alarm signal must always be acknowledged
and reset. Only then will the room group(s) resume normal operation according to
the time program.
No. Text
3890- Fire alarm off
3899
Central control unit RMB795B
Function block: "Room group"
Adjustable values / remarks
---, X1, X2, ... (digital inputs only).
N.X4 N.X5 N.X6
x Y x Y x Y
x x x x x
Raumgruppe 2
Effect
Urgent message; must be acknowledged and
reset.
x x x
SA EA
Enable
Setpoint prio
Relay
1 2
Q Q
CE1P3122en
18.01.2012