Spectrum Controls 1756sc-IF8u - Manual (Page 13)

Module Overview
This chapter describes the universal analog input module and explains how
the ControlLogix controller reads analog input data from the module. Read
this chapter to familiarize yourself further with your universal analog input
module. This chapter covers:
• general description and hardware features
• an overview of system and module operation
General Description
This module is designed exclusively for use in the Allen-Bradley
ControlLogix 1756 I/O rack systems. The module stores digitally
converted thermocouple, RTD, resistance, millivolt (mV), volt (V),
milliamp (mA), and CJC temperature analog data in its image table for
retrieval by all ControlLogix processors.
Following is a list of features available on the IF8u module that allow their
use in a wide variety of applications.
· Removal and insertion under power (RIUP) - a system feature that
allows you to remove and insert modules while chassis power is applied
· Producer/consumer communications - an intelligent data exchange
between modules and other system devices in which each module
produces data without having been polled
· Rolling timestamp of data - 15 bit module-specific rolling timestamp with
millisecond resolution which indicates when data was sampled/applied.
This timestamp may be used to calculate the interval between channel or
updates
· System timestamp of data - 64 bit system clock places a timestamp on
the transfer of data between the module and its owner controller within
the local chassis
· IEEE 32 bit floating point format
· On-Board Features, such as custom User Scaling, Process Alarms, Rate
Alarms, Digital Filtering, and Under/Overrange Detection
· Automatic Calibration - analog I/O modules may perform autocalibration
on a channel-by-channel or module-wide basis to reduce drift inaccuracies
due to module ambient temperature changes.
· Class I/Division 2, UL, CSA, CE, and FM Agency Certification
Chapter 1