Cabinet CSD consists of:
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unit of central station device (UCSD);
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interfaces converter unit Ethernet/RS-422 (INU) or Ethernet switch-boards;
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switching processor unit (SPU).
UCSD provides program realization of control algorithms and central relations of track switches and signals of interlocking system EC-EM and also automatic blocks signaling ABTC-EM on lines with present safety parameters. Units INU and SPU are used for connection with systems which have hardware architecture (2х2) and (2х2 V 2х2) and for increasing of necessary interfaces. UCSD includes three computation channels which bring into step programmatic (the rule of the “soft” synchronization provides time shifting on fulfillment of the same name procedures in different channels). During operation of CSD is provided continuous control of hardware-software condition. This control is based on period testing and comparison operation of computation channels with the application of majority voters 2 and 3. It could provide necessary safety and fale-safety level of CSD. Software of CSD works under control of operating system hard real time of Radioavionica JSC.
Software of CSD provides:
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implementation of control algorithms and central relations;
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implementation of safety functions;
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monitor and control of station facilities up to 400 centralized track switches;
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monitor and control of station with several control zones;
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monitor and control of facilities from basic station which are located at distance up to 120 km from CSD;
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organization of individual diagnostic data transmission channel.
Software of CSD consists of:
1. Technology software (TS) implements the interlocking algorithms (EC-EM) and automatic block signaling (ABTC-EM);
2. System software (SS) provides:
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data exchange between CSD and OCD by three independent network channels;
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interchannel comparison of Technology software databases, executable programs and continuous data;
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a set of modules that provides connection with external systems (SAUT, ABTC-M, digital module of track switches control, cab signaling).
3. Hard real time operating system (OS RT) AvRTOS-32 provides:
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soft synchronization of computation channels and interchannel transfer (diagnostic period is less 1 sec.);
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testing of equipment and network channels.
Technology software divides on two parts: first – for implementation of requirements system EC-EM, second – for ABTC-EM. The both parts can be adjusted in one CSD. In this case, functions of movement control on station and lines are integrated (integrated microprocessor-based interlocking system EC-EM/ABTC-EM). Operating system and System software are not required the modification and always adjust in standard set.