Model DI-5B32-01

Description

Each DI-5B32 current input module provides a single channel of analog input which is filtered, isolated, amplified, and converted to a high level analog voltage output (see block diagram). This voltage output is logic switch controlled, which allows these modules to share a common analog bus without the requirement of external multiplexers.

The DI-5B modules are designed with a completely isolated computer side circuit which can be floated to ±50V from Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously by simply connecting pin 22, the Read-Enable pin to I/O Common, pin 19.

A precision 20Ω current conversion resistor is supplied with the DI-5B32 module (see block diagram for installation details). Signal filtering is accomplished with a sixpole filter which provides 95dB of normalmode rejection at 60Hz and 90dB at 50Hz. Two poles of this filter are on the field side of the isolation barrier, and the other four are on the computer side.

After the initial field-side filtering, the input signal is chopped by a proprietary chopper circuit. Isolation is provided by transformer coupling, again using a proprietary technique to suppress transmission of common mode spikes or surges. The module is powered from +5VDC, ±5%.

A special input circuit on the DI-5B32 modules provides protection against accidental connection of power-line voltages up to 240VAC.

Accessories

Specifications

Input Range:	4-20mA
Input Resistor:	Value: 20.00Ω Accuracy: ±0.1% Stability: ±10ppm/ºC
Input Protection:	Continuous: 240Vrms max Transient: ANSI/IEEE C37.90.1-1989
CMV, Input to Output:	Continuous: 1500Vrms max Transient: ANSI/IEEE C37.90.1-1989
CMR (50Hz or 60Hz):	160dB
NMR:	95dB at 60Hz, 90dB at 50Hz
Accuracy:	±0.05% span ±0.05% (IZ) (Includes nonlinearity, hysteresis and repeatability; IZ is the input voltage that results in 0V output.)
Nonlinearity:	±0.02% Span
Stability:	Input Offset: ±50nA/ºC Output Offset: ±20µV/ºC Gain: ±25ppm/ºC
Noise:	Input, 0.1 to 10Hz: 10nArms Output, 100kHz: 200µVrms
Bandwidth, -3dB:	4Hz
Response Time, 90% Span:	0.2s
Output Range:	0 to +5V
Output Resistance:	50Ω
Output Protection:	Continuous Short to Ground
Output Selection Time: (to ±1mV of Vout)	6µs at Cload = 0 to 2000pF
Output Current Limit:	±14mA max
Output Enable Control:	Max Logic “0”: +0.8V Min Logic “1”: +2.4V Max Logic “1”: +36V Input Current, “0”, “1”: 0.5µA
Power Supply Voltage:	+5VDC ±5%
Power Supply Current:	30mA
Power Supply Sensitivity:	±20µV/%RTI (RTI=Referenced to input.)
Mechanical Dimensions:	2.28" × 2.26" × 0.60" (58mm × 57mm × 15mm)
Operating Temperature:	-40ºC to +85ºC
Storage Temperature:	-40ºC to +85ºC
Relative Humidity:	0 to 95% Noncondensing
RFI Susceptibility:	±0.5% Span Error at 400MHz, 5W, 3ft

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