7.12 Device bus
Using the device bus, it is possible to connect up to 32 device from the Series 55xx. For con-
nection, the TROVIS 5579 Controller is, above all, equipped with the terminals 29/30.
No attention must be paid to the polarity of the device bus wiring.
Danger of short circuit!
If several TROVIS 55xx Controllers in one plant are to be connected to the building control
station using the system bus interface and the cable converter 1400-8800, remember that all
controllers sharing the same bus distributor are also connected over the device bus. Do not
wire such controllers in “parallel“ by connecting terminals 29/30.
Activate the device bus and specify the device bus address for each device. Note that the de-
vice bus address 1 is to be set for just one controller in the system, and that all device bus
addresses must be unique. The controller with device bus address 1 implements the required
bus bias voltage for the system.
Once the controllers have been connected and programmed, additional functions can be
configured. These partly application-specific functions include:
4
Requesting and processing an external demand (–> page 105)
4
Sending and receiving outdoor temperatures (–> page 107)
4
Synchronizing the clock (–> page 107)
4
Priority over all controllers (–> page 108)
4
Connecting a TROVIS 5570 Room Panel (–> page 108)
4
Display error messages issued by the device bus (–> page 109)
7.12.1 Requesting and processing an external demand
In general, the controller which controls the primary valve or boiler (= primary controller) in
a system of coupled controllers will process the demand of all subsequent controllers (= sec-
ondary controllers). As a result, the primary controller must be configured to receive this de-
mand. Usually, the secondary controllers are configured such that they send their maximum
flow set point to the primary controller. In special cases, however, it might happen that only
the set point of a control circuit is to be sent. The appropriate function blocks to do so are
also available. After the desired function blocks have been activated, you must specify a reg-
ister number.
The following applies: in a system of linked controllers which are hydraulically supplied by a
primary controller, all controllers (primary and secondary controllers) must have the same
Register no.
setting for the “demand registers“. A controller which is configured to receive a
demand in register no. 5 will not process a demand sent to register no. 6.
EB 5579 EN
105
System-wide functions
!
Summary of Contents for TROVIS 5579
Page 6: ...6 EB 5579 EN...
