Specifications

4P357732-1 – 2014.04 Page 37 of 58
3.2 Holding registers
Holding register
VRV Sky-air
HRV Split VRV hydrobox LT & HT Air curtains ERQ control box Heating Applied
“Forced off”
Central “Forced off” for all
connected DIII units.
Actual behaviour depending on
user interface.
Example:
BRC1E52A/B7 & BRC2/3C52C7
centralized control icon is
shown and all connected DIII units
are forced off.
(Note:
Central “forced off”: Only available
when no other DIII device is
detected.
See Input register “Other DIII
device exists“ 30001 bit 1)
O
O
O
O
O
O
O
O
O
41001
Bit
Description
Meaning
15..1
-
0
Centralised
forced off
0: none
1: Forced
off
Initial value is 0.
Additional information concerning the forced off function.
Situation 1: A DIII unit that lost communication to Modbus Interface DIII (due to wire communication
problem or power outage of Modbus InterfaceDIII):
Consequence: After some minutes, the forced off will automatically be de-acivated by the DIII
unit.
Modbus Interface DIII required actions to return to the previous state:
In case Modbus Interface DIII also had a power outage:
After the power is restored and the DIII unit is discovered then re-activation (holding
register set) of forced off function is required.
In case Modbus Interface DIII lost communication with DIII unit:
After re-discovery, de-activation (holding register reset) and re-activation (holding
register set) of forced off function is required.
Situation 2: A power outage of a DIII unit only
Consequence: After the power is restored, the forced off is automatically activated again.
Situation 3: A power outage of a DIII unit and Modbus Interface DIII at the same time:
Consequence: After the power is restored, the forced off is de-acivated.
Modbus Interface DIII required actions to return to the previous state:
After the power is restored and the DIII unit is discovered, re-activation (holding register
set) of forced off function is required.