Spectrum Controls 1756sc-IF8u - Manual (Page 84)

72 ControlLogix ™ Universal Analog Input Module
RTD Conversion JIS C 1602-1997 for Pt 385
JIS C 1604-1989 for Pt 3916
SAMA RC21-4-1966 for the 10 Ω Cu 426 RTD
DIN 43760 Sept. 1987 for the 120 Ω Ni 618 RTD
MINCO Application Aid #18 May 1990 for the 120 Ω Ni 672 RTD
Thermocouple NIST ITS-90 standard
Linearization
RTD Current Source 252μA or 1.008mA, one for each RTD channel
Cold Junction
Compensation 2 Onboard CJC Sensor Required
Input Impedence Greater than 1M Ω > Ohm Voltage / Thermocouple / RTD
< 250 Ω current
Temperature Scale °C or °F
(Selectable)
Open Circuit Detection via Underrange
Does not apply to ±10V range
Time to Detect < 5 Seconds
Open Circuit
Input Step Response 0 to 95% in 190 msec (50/60 Hz)
Display Resolution IEEE Floting Point
Overall Module Accuracy See Module Accuracy Tables below
@ 25°C (77°F)
Overall Module Accuracy See Module Accuracy Tables below
(0°C to 60°C, 32°F to 140°F)
Overall Module Drift See Module Accuracy Tables below
Module Update Time Dependent upon enabled channels (see Update Time, Chap 3)
Channel Turn-Off Time Up to one module update time
Overall Accuracy
The accuracy of the module is determined by many aspects of the
hardware and software functionality of the module. The following
attempts to explain what the user can expect in terms of accuracy based
on the thermocouple, RTD, resistance, and millivolt, volt, and milliamp
inputs for the IF8u module.
The accuracies specified as follows include errors due to the cold junction
compensation for thermocouples, current source errors for RTDs, and
hardware and software errors associated with the system, which depends
upon input path. RTD accuracies do not include errors due to lead