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Variable air volume controllers
Modbus register description
(continued)
Register 105:
Malfunction and service information
The status information is split into messages about the actuator (malfunctions) and other
service information.
Bit Description
Malfunctions
(low byte)
0 Excessive utilisation
1 Mechanical travel increased
2 Mechanical overload
3 –
4 Safety-relevant faults (fire protection only)
5 Damper test error (fire protection only)
6 Duct temperature too high (fire protection only)
7 Smoke detector tripped (fire protection only)
Service
(high byte)
8 Internal activity (test run, adaption, …)
9 Gear disengagement active
10 Bus watchdog triggered
11 –
12 –
13 –
14 –
15 –
The malfunction bits can be reset with Register 3 (command 4) or with the Belimo PC-Tool.
Malfunctions 0 and 4 cannot be reset.
Register 106: Min / Vmin setting
Minimum limit (position or volumetric flow) in hundredths of one percent,
i.e. 0…10 000 correspond to 0…100%
Caution: Changing the setting may result in malfunctions.
Register 107: Max / Vmax setting
Minimum limit (position or volumetric flow) in hundredths of one percent,
i.e. 2000…10 000 correspond to 20…100%
Caution: Changing the setting may result in malfunctions.
Register 108: Sensor type
Sensor type connected to the actuator; in the absence of sensor specification, the switching
at the Y input will have the effect of a local compulsion.
Sensor type
0 None
1 Active sensor (mV)
2 Passive sensor 1 k (Ω)
3 Passive sensor 1 … 20 k (Ω)
4 Switching contact (0 / 1)
Register 109: Bus fail position
Modbus communication is not monitored as standard. In the event of a breakdown in
communication, the actuator retains the current setpoint.
The bus monitoring controls the Modbus communication. If neither the setpoint (Register 1)
nor the override control (Register 2) is renewed within 120 seconds, the actuator controls to
the bus fail position (closed / open).
Triggered bus monitoring is indicated in Register 105.
Bus fail position
0 Last setpoint (no bus monitoring)
1 Fast close if time is exceeded
2 Fast open if time is exceeded
Note
After changing the sensor type, the actuator
must always be restarted in order for correct
sensor values to be read out.
