Rockwell Automation MDO32BNS 32-Channel Digital Output Module - Manual (Page 5)

MDO32BNS October 2005 – Issue 7 5
Triguard SC300E MDO32BNS 32-Channel Digital Output Module
TECHNICAL DESCRIPTION
PHYSICAL
The Digital Output Module is a 9U high PCB with integral front panel and rear connectors; a
plug-in daughter board carries the Common Interface circuits. The general layout, location of
the connectors, front panel components and the configuration links are shown in Figure 1-1
MECHANICAL CODING BLOCKS
All Input/Output modules carry two mechanical coding 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 coding blocks to
enable fitting. Unused holes are plugged with set screws. The chassis coding block
configuration for this module is shown in Figure 2-1.
Figure 2-1. Chassis mechanical coding block configurations
EXTERNAL CONNECTIONS
Field circuits
The field load circuit shown in Figure 2-2 is the absolute minimum required for the safe
connection of field loads to the Digital Output Module. For any unused channel which may
never be switched on a dummy field load (4.7k ohm resistor of adequate wattage) must be
used. If a channel may be switched on, the total load should not exceed 1.2 k ohm maximum.
We however, recommend the use of their 16 Channel Digital Output termination cards
TDO16*IN which offer full connection facilities with indicating fuses, alarm outputs and dummy
loads (see Associated documentation).