INTRODUCTION
MODULE DESCRIPTION
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WBPEEUI240752A0
®
MODULE DESCRIPTION
The digital input module consists of a single printed circuit
board that occupies one slot in a module mounting unit
(MMU). It monitors two separate groups of eight digital inputs.
Twelve inputs are isolated from each other; the remaining two
pairs share common positive input lines.
Two captive screws on the module faceplate secure it to the
MMU. Sixteen front panel LED status indicators (group A and
group B) display the input status and provide aid in system
test and diagnosis.
The digital input module has three card edge connectors for
external signals and power (P1, P2 and P3). P1 connects to
common (ground) and +5 VDC power. P2 connects the module
to the I/O expander bus to communicate with a control mod-
ule. P3 inputs the digital signals using a cable connected to a
termination unit (TU) or termination module (TM). The termi-
nal blocks (physical connection points) for field wiring are on
the TU/ TM.
Figure 1-1. INFI 90 OPEN Communication Levels
COMMUNICATION HIGHWAY (INFI-NET OR PLANT LOOP)
CONTROLWAY
MFP
TU/TM
TU/TM
TU/TM
OTHER MODULES
OTHER I/O
MODULES
I/O EXPANDER BUS
COMMUNICATION
MODULES
T00083A
IMDSI
IMCIS 2
IMDSO
