Rockwell-automation 1771-IFMS Intrinsically Safe Fast Millivolt Input Uživatelský manuál stáhnout pdf (Strana 41)

Publication 1771-6.5.119

Appendix

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

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

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 59 60

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