74 Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
Chapter 4 Temperature-sensing Analog Modules
To avoid increased module error resulting from increased resistance levels, the
module can automatically compensate for resistance levels and maintain its
accuracy. The module measures the wire resistance and actively compensates for
that resistance with each sample.
Synchronized Sampling
This feature lets you synchronize input sampling across inputs on multiple
modules in the same chassis, or same system if time is synchronized via CIP Sync,
forcing those inputs to sample simultaneously within approximately 20 µS of
each other.
For example, if you have 12 input devices connected to two temperature-sensing
analog modules and one isolated analog input module in the same chassis, or
different chassis synchronized to the same CIP Sync Time Master, use
Synchronized Sampling to take a snapshot of the input data available at each
input at a single moment in time.
The following conditions must exist to use this feature:
• A 1588 CIP Sync Time Master is configured for the chassis.
• All modules in the set use the same RPI value or values that are multiples
of each other.
• Synchronized Sampling with Other Synchronized Modules is enabled for
all input channels in the set.
For these input modules, configuring one channel for Synchronized
Sampling synchronizes all eight channels.
While setting the RPI to the same value on all modules guarantees that each
module samples at the same rate, it does not guarantee that they sample at the
same time.
This functionality works when thermocouple wiring is connected to the
module before the module is powered or power is cycled to the module.
Connect wiring to the module before applying or cycling module
power.
You can disable compensation by removing the wiring prior to a power cycle
and reconnecting the wiring later.
Synchronized Sampling is not limited to input sample across inputs on the
same module types.
You can use Synchronized Sampling across inputs on isolated analog input
modules and temperature-sensing analog modules in the same system.
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