# Sleeping (SL)

SL.1The Sleeping (SL) mode is used to manage the ETCS on-board equipment of a slave engine when it is remote controlled.

Since there is no driver, no information is shown on the desk(s) of the sleeping engine. For this reason, the desk(s) of the sleeping engine must remain closed.

The notion of responsibility of the driver is not relevant for this mode.

In Sleeping mode, the leading engine is responsible for the movement of the train.

SL-[L2].1When a transition to Sleeping (SL) occurs while the train is in level 2, the on-board opens a communication session with the previously contacted RBC to report the mode change.

SL.2The following mode transitions can be triggered from SL mode:

1. NP mode. Transition triggered when the ETCS on-board is powered off as indicated in section OFF.PWR Power off the ETCS on-board (PWR)).
2. SB mode. Transition triggered when the desk of the sleeping engine is opened while the train is running (see section SB.OPN Open the desk (OPN)).
3. IS mode. Transition triggered when the driver isolates the ETCS on-board equipment (see section IS.ENT Entering Isolation mode (ENT)).

SL.3The information about Sleeping mode is sent to the train interface via a two state input with the following values:

1. Sleeping requested,
2. Sleeping not requested.

The input value “Sleeping requested” is used by ERTMS/ETCS on-board as one of the conditions for the transition to Sleeping mode. The other two conditions are "standstill", which is managed internally in the ERTMS/ETCS on-board and "All desks connected to the ERTMS/ETCS on-board equipment are closed", equivalent to "All cabs connected to the ERTMS/ETCS on-board equipment are not active", which is generated internally in the ERTMS/ETCS on-board based on the input values "Cab not active" as indicated in section.

SL.4After successful train inauguration, i.e. one master vehicle exists, defined by strictly one activated cab in the train, the information about successful master definition shall be communicated train-wide to all ERTMS/ETCS on-board units by means of the value "Sleeping requested".

Exception: The ERTMS/ETCS on-board connected via the cab status input with the active cab may be excluded from getting the "Sleeping requested" information because it is not relevant for this ERTMS/ETCS on-board.

If no active cab exists in the train, this information shall be communicated train-wide to all ERTMS/ETCS on-board units by means of the value "Sleeping not requested". By means of this configuration of the sleeping input it is ensured that the ERTMS/ETCS on-board will only go to sleeping mode if another cab in the train is active, i.e. another train control system (ETCS or national) provides the supervision of the train movement.

SL.5If the sleeping input information is set to "sleeping not requested" (no more detection of the remote control), the switch to Stand-By mode shall be made only if the train is at standstill.

SL.6The driver / train preparer shall make sure that all driving desks of any non-leading traction unit, which is electrically connected to and will be remotely controlled from the leading one, are closed and remain so as long as this traction unit is remotely controlled from the leading one.