Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 79)

Publication 1762-UM003A-EN-P - February 2003
Specifications A-3
Specification 1762-IR4
Accuracy Drift at 0 to 55° C (+32 to
+131°F) ±0.026°C/°C (0.026°F/°F) for Pt 385
±0.023°C/°C (0.023°F/°F) for Pt 3916
±0.012°C/°C (0.012°F/°F) for Ni
±0.015°C/°C (0.015°F/°F) for NiFe
±0.032°C/°C (0.032°F/°F) for Cu ±0.007
Ω
/°C (0.012
Ω
/°F) for 150
Ω
range
±0.023
Ω
/°C (0.041
Ω
/°F) for 500
Ω
range
±0.043
Ω
/°C (0.077
Ω
/°F) for 1000
Ω
range
±0.072
Ω
/°C (0.130
Ω
/°F) for 3000
Ω
range
Repeatability
(1) ±0.1°C (±0.18°F) for Ni and NiFe
±0.2°C (±0.36°F) to ±0.2°C (±0.36°F) for other RTD inputs
±0.04
Ω
for 150
Ω
resistances
±0.2
Ω
for other resistances
Excitation Current Source 0.5 mA and 1.0 mA selectable per channel
Open-Circuit Detection Time
(2) 6 to 1212 ms
Channel Update Time Input filter and configuration dependent.
Input Channel Configuration Via configuration software screen or the user program (by writing a unique bit pattern into the
module’s configuration file). Refer to your controller’s user manual to determine if user program
configuration is supported.
Calibration The module performs autocalibration on channel enable and on a configuration change between
channels. You can also program the module to calibrate every five minutes.
Module OK LED On: module has power, has passed internal diagnostics, and is communicating over the bus.
Off: Any of the above is not true.
Channel Diagnostics Over- or under-range or broken input by bit reporting
Maximum Overload at Input Terminals ±35V dc continuous
Cable Impedance Max. 25
Ω (
Operating with >25
Ω
will reduce accuracy.)
Input Impedance >10 M
Ω
Power Supply Distance Rating 6 (The module may not be more than 6 modules away from the system power supply.)
Channel to Bus Isolation 500V ac or 707V dc for 1 minute (type test)
30V ac/30V dc working voltage (IEC Class 2 reinforced insulation)
Channel to Channel Isolation ±10V dc
Vendor I.D. Code 1
Product Type Code 10
Product Code 65
(1) Repeatability is the ability of the module to register the same reading in successive measurements for the same input signal.
(2) Open-circuit detection time is equal to channel update time.