4P642495-1A
–
2022.02
Page
32
of
52
3.2 Holding registers
Holding register
VRV
Sky
-air
H
RV
Sp
lit
VRV h
yd
ro
b
o
x
LT
&
H
T
Air cu
rta
in
s
ERQ
con
tro
l b
o
x
H
eat
in
g
Ap
p
lie
d
“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.
