INTRODUCTION
MODULE DESCRIPTION
1 - 2
WBPEEUI240755B0
®
The I/O module has three connection points for external sig-
nals and power (P1, P2 and P3). P1 connects to a common
(ground) and +5 VDC and ±15 VDC power (refer to Table
P2 connects the module to the control module through the I/O
expander bus (refer to Table
). The field I/O signals are
exchanged through connector P3 using a cable connected to a
TU or TM (refer to Table
). The terminal blocks (physical
connection points) for field wiring are on the TU or TM.
The I/O module accepts digital signals of 24 VDC, 48 VDC, 125
VDC and 120 VAC. Individual voltage jumpers on the module
configure each input. A fixed response time (17 milliseconds)
allows the INFI 90 OPEN system to compensate for process
field device debounce time. It outputs digital signals of 24 VDC
that can sink 250 milliamperes at 24 VDC and 125 milliam-
peres at 48 VDC.
It accepts analog signals of one to five VDC (single ended or
differential). Its respective termination unit (TU) or termination
module (TM) converts a four to 20-milliampere current to a
voltage that is sent to the I/O module. The analog output mode
Figure 1-1. INFI 90 OPEN Communication Levels
T01315A
COMMUNICATION HIGHWAY (INFI-NET OR PLANT LOOP)
CONTROLWAY
MFP
OTHER MODULES
COMMUNICATION
MODULES
TU/TM
TU/TM
OTHER I/O
MODULES
QRS
CIS
I/O EXPANDER BUS
