Signal Logic - Viessmann 5229 Bedienungsanleitung

5.1 Transmission of the signal aspect
The signal bus transmits the signal aspect (the track speed) to the receiving signal located one block back. That signal
generates the correct aspect for itself and its distant signal by combining the information contained in the command plus
the feedback from the following signal. If necessary it changes the signal aspect of main signal and distant signal. The
command received is in turn transmitted to the preceding signal and so forth.
The signal bus works with different signal types and signal generations. Thus no additional circuitry or higher authority
is required.
5.2 Transmission of track occupancy status
The signal bus not only conveys the signal aspect but also the track occupancy status of all track sectors connected to
the module or push-button inputs. Without this information the operation with block signals (block logic) is not possible!
5.3 Branches of the signal bus
The Viessmann signal bus can have branches. Thus the information always travels according to the set route. Cyclical
transmission assures speedy update of status if a new route is switched. Therefore, a light entry signal always shows the
correct aspect of its distant signal, if the signal bus is deviated parallel to the position of the points or crossings by means
of a double-pole relay (e. g. Viessmann electronic relay 2 x 2 UM, item 5552).
In the same manner the signal bus can be switched to match the route for exit signals. The difference is that the route
does not branch out but several routes merge. Therefore, the relays are wired in the opposite way (see fig. 6).
6. Signalling logic
There are not only different types of signals but the same types may have different functions subject to their location.
Therefore their functionality changes. There are 2 types of logic: The yard signalling logic and the block signalling logic.
The Viessmann control module can be set for both types.
6.2 The yard signalling logic
The normal aspect of a yard signal is "stop". It responds to the sockets / buttons "Hp0" and "Hp1", multi-aspect signals
also to "Hp2" and "Sh1". These inputs are always active. The input "Hp0", setting the signal to "stop", has preference
before all others. Thus the signal will definitely show the "stop" aspect if this input is activated.
The input "braking" is only active if you use a digital brake module, e. g. Viessmann, item 5232, and have configured the
signal accordingly (see chapters 6.3 and 6.4).
If the signal is set to "stop" a relay for train control, item 5228 will be set in such a way that it disconnects traction current
from that track sector. If the signal shows any of the other aspects the power will be reconnected.
If you use multi-sector signals or signals carrying the distant signal of the following main signal on their mast in yard logic,
the modules have to be connected by the Viessmann signal bus in order to enable the signals to show the correct aspect.
6.2 Block signalling logic
If you want to use block signalling logic your layout must be equipped with track occupancy sensors continuously
providing the occupied / clear information. With Märklin track this can be achieved by isolating one outer track while
track without centre contacts require current guards in individual sectors. We recommend the Viessmann track
occupancy sensor, item 5206 for 8 separate track sectors.
Each block sector (fig. 6) consists of 2 parts, the running sector and the stop sector. The running sector is to be con-
nected to the "Sh1" input and the stop sector to the "brake" input. The signal modules have to be wired via the signal
bus since the occupancy status mainly influences the preceding signal. Even in block signalling logic the signal bus may
have branches.
The normal position of the block signal is "proceed". If the signal bus reports one or two of the following sectors as
occupied then the signal is automatically set to "stop". Once the signal bus reports a clear track ahead the signal shows
"proceed" again.
This automatic change of aspect also occurs when due to switching a point the signal bus follows another route and
responds to the occupancy feedback of another control module.
Should a control module be disconnected from the following signal and does not receive any more information via the
signal bus then the signal will automatically change to "stop" after a short while. If the connection to the signal bus is
reinstated, the signal will automatically be set to the appropriate aspect. This also takes place after a short waiting period.
6.3 Using the digital brake module, item 5232 in Märklin Motorola mode
You may use the Viessmann digital brake module, item 5232 regardless of the signal logic. It serves to slow down a train
ahead of stop signal until it stops. The wiring of the layout has to be done as shown in the manual of the brake module.
At least one running sector and a stop or braking sector is required. Together they have to be as long as the longest train
on the layout plus the braking distance
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