Technical Description; External Connections - ABB Triguard SC300E User Manual

Triguard SC300E

TECHNICAL DESCRIPTION

PHYSICAL
The MDO16GNS is a 9U high module with integral front panel and rear connectors. A
daughterboard carries the common interface circuits. Figure 1-1 shows the general layout,
including the location of the connectors and front panel details.
Mechanical coding blocks
All Input/Output modules carry two coder blocks equipped with pins which mate with holes in
corresponding blocks in the chassis and prevent the module being inserted into the wrong slot.
The pins in the module blocks are factory installed in a pattern determined by the module and
corresponding set screws are removed from the chassis coder blocks to enable fitting. Unused
holes are plugged with set screws. The chassis slot coder block configuration for this module
is shown in Figure 2-1 .
Figure 2-1 Chassis slot coder blocks configuration

EXTERNAL CONNECTIONS

Field Circuits
The field load circuit shown in Figure 2-2 is the typical required for the safe connection of field
loads to the MDO16GNS. For any unused channel a dummy field load (value 10k ohm) should
be used. We however, recommend the use of their 16-Channel Digital Output Termination
Card TDO16AIE which offers full connection facilities with dummy loads, indicating fuses and
alarm outputs (See Section 1.2, Associated documentation).
6 MDO16GNS October 2005 – Issue 2