ABB Relion REG670, Техническое руководство

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21.2.2 Numeric processing module (NUM)
21.2.2.1 Introduction
The Numeric processing module (NUM), is a CPU-module that handles all protection
functions and logic.
For communication with high speed modules, e.g. analog input modules and high
speed serial interfaces, the NUM is equipped with a Compact PCI bus. The NUM is
the compact PCI system card i.e. it controls bus mastering, clock distribution and
receives interrupts.
21.2.2.2 Functionality
The NUM, Numeric processing module is a high performance, compact-PCI CPU
module. It is 6U high and occupies one slot. Contact with the backplane is via two
compact PCI connectors and an euro connector.
The NUM has one PMC slot (32-bit IEEE P1386.1 compliant) and two PC-MIP slots
onto which mezzanine cards such as SLM or LDCM can be mounted.
To reduce bus loading of the compact PCI bus in the backplane the NUM has one
internal PCI bus for internal resources and the PMC/PC-MIP slots and external PCI
accesses through the backplane are buffered in a PCI/PCI bridge.
The application code and configuration data are stored in flash memory using a flash
file system.
The NUM is equipped with a real time clock. It uses a capacitor for power backup of
the real time clock.
No forced cooling is used on this standard module because of the low power
dissipation.
1MRK502052-UEN B
Section 21
IED hardware
1149
Technical manual