Spectrum Controls 1746sc-NI8u - Manual (Page 13)

Module Overview
This chapter describes the universal analog input module and explains how
the SLC controller reads thermocouple or millivolt 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
• block diagram of channel input circuits
General Description This module is designed exclusively to mount into Allen-Bradley 1746 I/
O racks for use with Allen-Bradley SLC 500 fixed and modular systems.
The module stores digitally converted thermocouple, RTD, millivolt (mV),
volt (V), milliamp (mA), and CJC temperature analog data in its image
table for retrieval by all fixed and modular SLC 500 processors. The
module supports connections of up to eight channels of thermocouple,
current or voltage inputs, OR four channels of RTD or resistance inputs
and four channels of thermocouple, current or voltage inputs.
Input Ranges
The following tables provide compatibility information on the supported
thermocouple types and their associated temperature ranges, the
supported RTD types and their associated temperature ranges, as well as
the millivolt, volt, milliamp and resistance input types supported by the
NI8u module. To determine the practical temperature range of your
thermocouple, refer to the specifications in appendices A and B. Detailed
accuracy specifications for all input types can be found in appendix A.
Table 1.1 Thermocouple Temperature Ranges
Type °C Temperature Range °F Temperature Range
J -210°C to 760°C -346°F to 1400°F
K -270°C to 1370°C -454°F to 2498°F
T -270°C to 400°C -454°F to 752°F
B 300°C to 1820°C 572°F to 3308°F
E -270°C to 1000°C -454°F to 1832°F
R 0°C to 1768°C 32°F to 3214°F
S 0°C to 1768°C 32°F to 3214°F
N 0°C to 1300°C 32°F to 2372°F
C 0°C to 2315°C 32°F to 4199°F
CJC Sensor -25°C to 105°C -13°F to 221°F
Chapter 1