ABB Relion 670 Series RES670, Technical Manual

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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.
1MRK 511 365-UUS A
Section 21
IED hardware
Phasor measurement unit RES670 2.1 ANSI 759
Technical manual