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SCM5B-Voltage I/O

Isolated Signal Conditioners for Backpanels

Analog Voltage Input Modul 4 Hz (5B30/5B31)

Each SCM5B30 and SCM5B31 voltage input module provides a single channel of analog input which is filtered, isolated, amplified, and converted to a high-level analog voltage output. This voltage output is logic-switch controlled, allowing these modules to share a common analog bus without the requirement of external multiplexers.

The SCM5B modules are designed with a completely isolated computer side circuit which can be floated to ± 50 V 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.

Signal filtering is accomplished with a six-pole filter which provides 95 dB of normal-mode rejection at 60 Hz and 90 dB at 50 Hz. 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 +5 VDC, ± 5%.

A special input circuit on the SCM5B30 modules provides protection against accidental connection of power-line voltages up to 240 VAC.


Analog Voltage Input Module 10 kHz (5B40/5B41)

Each SCM5B40 and SCM5B41 wide bandwidth voltage input module provides a single channel of analog input which is amplified, isolated, and converted to a high-level analog voltage output. This voltage output is logic-switch controlled, allowing these modules to share a common analog bus without the requirement of external multiplexers.

The SCM5B modules are designed with a completely isolated computer side circuit which can be floated to ± 50 V 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.

The input signal is processed through a wide bandwidth pre-amplifier on the field side of the isolation barrier. After amplification, 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 + 5 VDC, ± 5%.

A special input circuit on the SCM5B40 modules provides protection against accidental connection of power-line voltages up to 240 VAC.


Voltage Output Module 400 Hz (5B49)

Each SCM5B49 voltage output module provides a single channel of analog output. The track-and-hold circuit in the input stage can be operated in a hold mode where one DAC can supply many output modules, or a track mode where one DAC is dedicated to each module. In addition to the track-and-hold circuit, each module provides signal buffering, isolation, filtering, and conversion to a high-level voltage output.

Setting of the track or hold mode is controlled by the logic state of WR EN\, module pin 23. When pin 23 is low, the track mode is enabled. If pin 23 is high, the hold mode is enabled. The module is designed with a completely isolated computer side circuit which can be floated to ± 50 V 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 track and hold circuit. For a low state, simply connect pin 23, the Write-Enable pin, to I/O Common, pin 19.

The SCMPB02 and SCMPB06 backpanels allow host computer control of the WR EN\ control line, which allows multiplexing of one host DAC to up to 64 SCM5B49 output modules.

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Specifications

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  • Input: mV- or V-Signal
  • Output: 0 V...+ 5V / 0 V...+ 10V / - 5V...+ 5V / - 10V...+ 10V
  • Bandwidth 4 Hz / 10kHz / 400 Hz
  • Isolation 1500 Vrms
  • Input protection 240 Vrms / ± 36 V
  • Input Resistance 50 od. 200 MOhm / 650 kOhm (min.)
  • Accuracy ± 0.03%
  • Linearity ± 0.005% / ± 0.01% / ± 0.015%
  • ANSI/IEEE C37.90.1 Input protection
  • CMR 160dB / 100dB / 110dB
  • True 3-way isolation
  • NMR: 95/90dB at 60/50Hz // 120dB/Dec. > 10 kHz // 80dB/Dec. > 400 Hz
  • Power Supply +5 VDC
  • Operating Temperature Range -40°C … +85°C
  • Mix and Match Types on Backpanels possible
  • Dimensions 58 x 57 x 15 mm
  • Optional DIN Rail Mounting
  • CSA certified, CE and ATEX compliant
  • Wide range of accessories
  • Special Solutions on request