Specifications

3U Traffic Outstation Handbook
667/HB/26568/000 Page 117 Issue 15
9.6.4 Serial Link Between MOVA and an ST800 (MIO)
10) 9.6.4 If MOVA is to use a Bus / MOVA I/O Board, check that the SOP
handset command shows the correct type of I/O boards have been
detected and that MOVA is using one of them, see page 182.
If MOVA is to use the enhanced serial link to an ST800 but the
OMCU has not been configured, enable the facility manually using
‘
MIO=2’ and check that the enhanced serial link is active, i.e.
‘
EEL:3’.
The Siemens OMCU has had the option for some time of using an enhanced serial
link to an ST800 traffic controller to monitor the traffic controller. Through this link the
OMCU receives information such as the detector and green states to provide a more
integrated traffic product and to remove the need for almost all of the OMCU’s
external wiring.
This enhanced serial link can now also be used by MOVA in the new integrated
OMCU and MOVA unit (PB681 issue 10 or later). Over this link MOVA obtains the
states of all of its detectors and the stage/phase confirms from the ST800 traffic
controller and passes back the required force bits. Note that the ST800 traffic
controller must be configured to use ‘Serial MOVA’ for this facility to function. See
section 4.2.6 on page 32 for more details.
The unit will automatically attempt to determine whether MOVA should use its Bus /
MOVA I/O Board or the enhanced serial link after complete initialisation, i.e. INI=3 or
first time power-up, as follows:
If one or more Bus / MOVA I/O boards are fitted, then MOVA will initially attempt to
use the first Bus / MOVA I/O board fitted (“MIO:1”).
If only LMU I/O boards are fitted and no Bus / MOVA I/O boards, then MOVA will
initially not attempt to read any inputs or set any outputs (“MIO:0”). If the OMCU is
subsequently configured by the Instation to use the enhanced serial link, then MOVA
will also automatically attempt to use the enhanced 141 link (“MIO:2”).
Regardless of what the unit decides, MOVA can be manually configured to use the
first Bus / MOVA I/O board by entering “MIO=1” or to use the enhanced serial link by
entering “MIO=2”.
If MOVA is required to use a Bus / MOVA I/O board, always
use the handset command SOP to check that the correct I/O
boards have been detected by the firmware and that MOVA is using the first of
these (see page 182). However, if MOVA is required to use the enhanced serial
link, then check for ‘EEL:3’ (section 11.8) and check that the controller
firmware supports, and is configured to use serial MOVA (section 4.2.6). The
fault ‘MSF – MOVA Serial Fault’ will be raised if MOVA cannot communicate
over the link (see section 11.6.2 on page 162 for more details on the
OMCU/RMS fault log).
Important