Assortment / System Description

55
Relay outputs with… Number of
modules
Extension module
Universal
inputs
Analog
outputs
Ch’over contact NO contact
1 Universal module RMZ785 8 -- -- --
2 Universal module RMZ787 4 -- 1 3
Maximum number of modules: 3 per RMB795B (for extension modules, see page 57)
The RMB795B central control unit has 2 device-specific function blocks a
description of which is given below (FB = function block(s)).
Function blocks "Room group 1...10" control the operation of 1 to 10 room groups
(see configuration diagram on the left).
Features:
• A room group serves a maximum of 63 RX.. room controllers or RD.. room
thermostats, delivering the same …
– room operating modes, room temperature setpoints, setpoint readjustments
(summer/winter compensation), and emergency modes,
– application operating modes (controller mode: Auto, Night_Purge, etc.),
– extra functions, such as "Night cooling", can be activated, depending on the
application.
• Each room group has its own 7-day program (6 switching points per day); time
switch entries can be copied
• Each room group has its own calendar (16 programmable time periods), which
can also act on several time switches or room groups
• 1 to 3 individual rooms of a room group can be defined as reference rooms and
determine the preselection of the "Night cooling" function. The display of the
RMB795B shows the temperatures of the reference rooms per room group
• The currently highest and lowest room temperature of each room group is
displayed (overview of temperature distribution in a room group)
Room operating
mode
Explanation
Comfort
Operating mode for occupied rooms
Precomfort
Energy-saving operating mode for rooms
Economy
Plant off. Minimum/maximum room temperature ensured (sustained mode)
Protection
Plant off. Frost protection active
The same operating mode for several room groups can be preselected via uni-
versal inputs N.X_ (digitally configured for timer, manual switch), but the setpoints
of the room groups can differ.
xx xxx
QQ
x xx
1
2
Raumgruppe 2
xx xxx
QQ
x xx
1
2
N.X1
x
Y
SIGNAL Y
N.X2
x
Y
SIGNAL Y
N.X3
x
Y
SIGNAL Y
N.X4
x
Y
SIGNAL Y
N.X5
x
Y
SIGNAL Y
N.X6
x
Y
SIGNAL Y
Digital Digital Digital
3121Z01en
SA EA
SA EA
Relay
Setpoint prio
Relay
Setpoint prio
EnableEnable
Room group 1 Room group 2
Extension modules
Device-specific
function blocks
FB "Room group"
xx xxx
QQ
x xx
12
SA EA
Relay
Setpoint prio
Enable
Room group 1
Room operating modes
Example: Configuration
of room groups 1 and 2