OVERVIEW
WBPEEUI240752A0
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SECTION 1 - INTRODUCTION
OVERVIEW
The IMDSI1
Digital Input modules provide 16 separate digital
signals into the INFI 90
®
OPEN system for processing and
monitoring. It interfaces process field inputs with the INFI 90
OPEN Strategic Process Management System. A contact clo-
sure or switch is an example of a device that supplies a digital
signal. Control modules provide the control functions; I/O
modules provide the inputs and outputs. Four variations of
the IMDSI1
modules are presented in this instruction:
•
IMDSI12 - 24 VDC, 48 VDC, 125 VDC or 120 VAC inputs.
•
IMDSI13 - 24 VDC inputs.
•
IMDSI14 - 48 VDC inputs.
•
IMDSI15 - 125 VDC or 120 VAC inputs.
The IMDSI12 is the functional equivalent of the existing
IMDSI02 module with the restriction that the IMDSI02 offers
selectable debounce filter times of 1.5 milliseconds (fast) and
17 milliseconds (slow) and the IMDSI12 module offers only the
17 milliseconds (slow) debounce filter time. The slow debounce
filter is used in the majority of digital input applications.
Any of the IMDSI1
modules may be substituted in place of an
IMDSI02 where appropriate jumper settings are used. For
example, an IMDSI13 module may be substituted for an
IMDSI02 module that has all its jumpers set for 24 VDC with a
slow debounce filter.
Figure
shows the INFI 90 OPEN communication levels and
the position of the digital input modules within these levels.
INTENDED USER
This instruction is written for engineers, technicians and sys-
tem designers as a source of technical information on the
IMDSI1
digital input modules. This instruction should be
used by those planning to purchase, install, operate, trouble-
shoot, maintain or replace these modules. Those working with
the digital input modules should have experience working with
and know the precautions to take around AC/DC power. A
knowledge of the INFI 90 OPEN system and electronic princi-
ples is also required.
