136 Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 5 Using 1715 Analog I/O Module Features
1715-IF16 Analog Input Module
The analog input interface is a combination of input modules and analog input
termination assemblies. The 16-channel analog input module has a flexible and
fail-safe design.
The 1715-IF16 analog input module features are as follows:
• Flexible, modular construction for user-configured I/O applications
• 16-channel connection capability
• Suitable for simplex, duplex connections, and fault tolerant applications
• Independent, galvanically isolated input channels
• Built-in diagnostic testing and independent watchdog facility
• Module removal and replacement online and, when in Duplex mode, no
interruption of the signal inputs
The internal isolated power supply from the 24V DC dual redundant system
power inputs produces module power. The isolated power supply provides
power to the module and is protected by over-voltage and undervoltage
detection circuits. Supply voltage monitoring initiates a warning signal and
Power-off Protection mode when a power failure is detected.
Internal diagnostics test the module at routine intervals. An independent
watchdog arrangement also monitors the module operation and provides
more fault containment by activating a shutdown mechanism when a fault is
detected.
The adapter also monitors the input data paths and can detect faults within
each input channel. A visual indication of the module status and individual
channel status is provided by an array of front panel indicators and can be
connected to application variables and viewed in the Logix Designer
application.
The termination assemblies can accept one or two input modules. Each
termination assembly provides passive signal load termination and over-
voltage protection for each input channel. The system provides flexible input
connectivity by mating specific termination assemblies with the relevant
number of input modules.
IMPORTANT
If a fault occurs during normal operation in a duplex configured
system, an input module can be removed and replaced without
disrupting the input signals to a live system.
Table 19 - Performance Criteria for the Analog Input Module
Attribute Value
Data Input value least significant bit 0.98 µA
Channel Measurement Error at 25 °C (77 °F) ± 2 °C (± 3.6 °F)
After 1 year at 40 °C (104 °F)
After 2 years at 40 °C (104 °F)
After 5 years at 40 °C (104 °F)
0.21% + 10 µA
0.22% + 10 µA
0.23% +10 µA
Temperature drift (0.01% + 0.3 µA) per °C
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