Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 11)

Publication 1769-UM019A-EN-P - October 2008 11
Overview Chapter 1
System Overview The module communicates to the controller through the bus interface.
The module also receives 5 and 24V DC power through the bus
interface.
You can install as many analog modules as your power supply can
support. However, the modules may not be located more than eight
modules away from the system power supply.
Determine Power Supply Distance
Module Operation When you cycle power, the module performs a check of its internal
circuits, memory, and basic functions. During this time, the
module-status OK indicator remains off. If no faults are found during
power-cycle diagnostics, the module-status OK indicator is turned on.
After power-cycle checks are complete, the module waits for valid
channel-configuration data. If an invalid configuration is detected, the
module generates a configuration error. Once a channel is properly
configured and enabled, the module begins its conversion process.
Each time an input channel is read, the converted analog data value is
tested for an over-range or under-range condition. In addition, the
module supports user-configured high and low alarm condition tests
for each input channel. If any of these conditions are detected, unique
bits are set in the input-channel status word.
1
1 1 2 3 4 3 2
2 3 4
Syst
em Powe
r
S
uppl
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Co
m
pac
t I/
O
Co
mpact
I/O
Co
mpact
I/O
End Cap
Co
mpact
Log
ix C
ont
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or
I/
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Commu
nic
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Ad
ap
te
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Com
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I/
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C
ompac
t I
/O
C
ompac
t I
/O
or
Power Supply Distance
Co
m
pac
t I/
O
Co
m
pac
t I/
O
Co
mpact
I/O
Co
mpact
I/O
End Cap
MicroLogix 1500 Controller
with Integrated System
Power Supply
Power Supply Distance