Rockwell Automation MAI32AD 32-Analogue Input Module Differential Input - Manual (Page 6)

6 MAI32*AD October 2005 – Issue 4
Triguard SC300E
TECHNICAL DESCRIPTION
PHYSICAL
The Analogue Input 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 321/320 configuration link is 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 mechanical 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 input loop shown in Figure 2-2 is the absolute minimum required for the safe
connection of analogue inputs. We however, recommend the use of their 16 Channel
Analogue Input termination cards TAI16*** which can offer field power supplies, remote and
local alarm indication, transient suppression and signal and protective ground facilities.
Figure 2-3 shows a termination card for a current input module.