Rockwell Automation 1771-IFMS Intrinsically Safe Fast Millivolt Input Module User Manual - Manuel (Page 41)

Publication 1771-6.5.119
Appendix
A
Specifications
Intrinsically Safe Fast Millivolt Input Module - 1771-IFMS
Attribute Value
Inputs 8, differential, low-levels
Input voltage range 0…50 mV
Resolution 12-bit binary
Accuracy 0.1% of range @ 25 °C
Linearity ±1 LSB
Repeatability ±1 LSB
Input overvoltage
protection 32V
Input impedance 1M
Ω
Maximum input voltage ±10V
Common mode
rejection 100dB dc - 60 Hz
Backplane current 0.75 A @ +5V
BCD and unscaled
binary output to
processor 0000…4095
10
Engineering units sent
to the processor 9999 BCD with selectable scaling
32767 Binary
A/D converter Monotonic output with no missing codes
Resolution: 12-bit binary
Absolute accuracy: +0.1% full scale
Quantizing error: +1/2 LSB
Temperature coefficient: ±50ppm/°C of full scale range for
0…60 °C ambient
Recalibration time: calibration should be checked at 6 month
intervals to maintain specified accuracy
Internal scan rate: 14.5 ms for 8 differential inputs (no digital
filtering), add 2.5 ms for filtering
Isolation Voltage Type tested at 1500V AC for 60 s, system to field channels
No isolation between field channels
Wire Size 0.25…2.5 mm2 (22
…
14 AWG) solid or stranded copper wire
rated at 75 °C
(167 °F), or greater, 1.2 mm (3/64 in.) insulation max
Wiring Category (1) 2 - on signal ports
Wire Type Shielded
Keying between 20 and 22
between 28 and 30