Gspi; Power Supply; The Cpu Board - Siemens Stratos Outstation General, Installation, Commissioning & Maintenance Handbook

4.2

GSPI

The Generic Serial Peripheral Interface (GSPI) Bus is used within the system to connect
serial communications and power to the main intelligent components of the system. In the
Stratos Outstation the power source on the GSPI bus is the PSU board, but the
communications master is the CPU board.
The CPU board provides two RJ45 connectors to downstream peripherals both which are
on the same communications Bus. On each peripheral there are also two RJ45
connectors with "IN" and "OUT" connections allowing connection in from the master and
out to the next peripheral in the chain.
The PSU board, when powered from the Mains PSU module in normal powered mode
provides power on both its upstream and downstream GSPI RJ45 connectors. When the
Mains power fails and the unit enters battery backup mode the power is cut by software to
peripherals on the downstream ("OUT") side in order to preserve battery capacity.
For GSPI peripherals that have a general purpose I/O capability (e.g. the PSU board and
the IO board) their IO is mapped into the CPU board in 8 bit ports for example: gspi1.in.0.
For details on the I/O mapping process refer to the UTMC OTU Handbook
667/HB/46000/004. For the IO port mapping for specific peripherals, then please see their
respective section in this document.
4.3

Power Supply

The Stratos Outstation can be powered from a standard AC mains supply or an external
DC supply.
The following supply voltages may be used:
Nominal Voltage Minimum
Voltage
120V, 230V 90V
24V External DC 10V
(refer to
Engineering
Poole for more
information)
* If a backup battery is fitted, then support time will be 1 minute (software controlled).
See section 3.6
4.4

The CPU Board

The CPU board holds the configuration and performs the function of configuration, control
and management. The CPU runs the Linux operating system and specific applications for
functions such as MOVA7 and UTMC OTU.
Security classification Unrestricted
Version 3
Last Editor Alan Doyle
Document Name Stratos Outstation General and ICM Handbook
Copyright © Siemens plc 2014. All Rights Reserved.
Maximum Frequency
Voltage
264V 50/60Hz +/-4%
DC
28V
Table 4 – Power Supply Voltages
Mobility and Logistics is a division of Siemens Plc
Mobility, Intelligent Traffic Systems
Sopers Lane, Poole, Dorset, BH17 7ER
Power Break Support
Time
50ms under max load*
Depends on external
supply and backup
battery configuration.
Page 27 of 92
Status Issued
Date 05-Oct-2017
Document No. 667/HB/52250/000