2.1 GENERAL DESCRIPTION
The Dual Node Module is a chassis containing one or two nodes. Each node performs an
independent function and occupies a specific address on the Local Control Network
(LCN). Figure 2-1 shows the module functions within a typical TDC 3000 X System. The
types of nodes available in the Dual Node Module include Application Modules, Network
Interface Modules, History Modules, Universal Stations, Hiway Gateways, and other
types of gateways.
The Dual Node Module can accommodate one three-board node and one two-board node.
Each node has its own power supply—the Dual Node Power Supply (DNPWR). The Dual
Node Module also includes a front panel, chassis, and a cooling fan assembly. The chassis
consists of a card cage and backplane assembly. The component cards (boards) mount in
the front of the card cage assembly, and the associated input/output (I/O) boards mount in
the rear, similar to the method used in Five- and Ten-Slot Modules.
To Data Hiway
Figure 2-1 — TDC 3000 X Module Functions
The K2LCN or the K4LCN board is a common element of nodes implemented in the Dual
Node Module. It combines the functions of kernel (processor), memory, and LCN (Local
Control Network) interface in a single board. The K2LCN or K4LCN board is used in
conjunction with CLCNA and CLCNB boards. These boards provide the physical
interface to the redundant cables of the LCN (the "A" and "B" cables) which interconnect
the equipment in a TDC 3000 X control room. The KLCNA and KLCNB boards are
installed in the I/O card cage at the rear of the module as shown in Table 2-1. One of each
is required, regardless of whether one or both nodes are implemented.
Dual Node Module Service
PLANT INFORMATION NETWORK (PIN)
LOCAL CONTROL NETWORK (LCN)
Universal Control Network To NGs on Other LCNs