MSP Analog Open I/O - Features


MSP Open I/O Family

Analog I/O Modules for PLCs


  • Adds single channel analog in or out to a PLC
  • Field re-configure signal range
  • Allows "distributed" control strategy
  • 16-bit resolution
  • Reduces wiring and installation costs
  • Accuracy of 0.05 Full Scale, 0.2C Cold Junction Compensation
  • Uses only one discrete PLC I/O point
  • 1500v, 3 way power and channel to channel isolation
  • Compatible with most PLC platforms
  • Windows based reconfiguration utility
  • Low cost per channel
  • 88mm x 68mm x 12mm terminal block size
  • Factory preconfigured input signal types: thermocouple, current, voltage, RTD, frequency, potentiometer
  • Designed to meet or exceed UL/CSA standards
  • Factory reconfigured output signal types: current or voltage
  • CD European EMC directive (89/336/ECC) compliant
  • Input signal scaled and linearized


SensorPulse's MSP family of analog I/O blocks offers the freedom to use any analog sensor with many different PLC models. Each MSP block provides a single analog input (or output) interface between the PLC and analog world. Communication between the MSP unit and PLC is through a patented protocol that provides a truly "open" architecture for analog signals to be processed digitally.

Click here to see a list of the latest PLC Software Drivers that SensorPulse offers.

The MSP is factory preconfigured to support a specific analog input signal type, depending on the model. Optionally, the MSP signal range can be reconfigured in the field to meet custom requirements.

Overview of the Input Analog Module

The analog input signal is isolated, filtered, amplified, scaled and/or linearized by the MSP micro-processor and converted to a 16-bt, binary weighted, digital word which is transmitted serially (one bit at a time) at 24VDC signal levels to the PLC's discrete I/O port. At the PLC, each binary-weighted bit sent to the discrete input is temporarily stored until all 16 bits have been received. The digital word is then reassembled and it's value (proportional to the analog signal) is placed in a PLC's working register of choice.

Overview of the Output Analog Module

The numerical value representing a desired analog output signal is placed into a PLC working register of choice. This value is transmitted serially (one bit at a time) at 24VDC signal levels to the MSP through the PLC's discrete I/O port. The MSP scales, linearizes and proportionally converts the digital signal to the voltage or current output signal. The signal is then sent to the isolated output channel for use by an analog actuator connected at the output channel.


Installing the preconfigured MSP is easy...snap the 12mm wide enclosure on a DIN rail, supply an external 15-30VDC power source, connect the analog input, connect the THHN, MTW (or any low cost stranded wire) to the PLC. At the PLC, select the supplied PLC driver for your PLC and paste the driver into your PLC program. Field reconfiguration of the signal range through Windows/PC or Windows/CE HPC (handheld personal Z computer) is accomplished with the optional MSP configuration utility. Each MSP module is contained within a small profile terminal block (88mm x 68mm x 12mm) DIN rail mountable enclosure.

Configuration Software

In-field configuration is available with SensorPulse's SigFlex Configurator Utility.  Configuration changes may be made as the customer's requirements change. 

Power Supplies

Also available are several DIN rail mount power supplies designed to provide required power for SensorPulse modules. These power supplies are also certified by UL, CSA and CE for use in industrial applications. The power supplies accept from 85 to 265 VAC and provide 24 VDC at various current levels depending on the model specified.

Go to the MSC/MSP Open Signal Family Specification Page

SensorPulse Corp. P.O. Box 8886 Michigan City, IN 46361 Ph: (800) 447-5900 or (219) 393-7218 Fax: (219) 393-7318

1998-2002 SensorPulse Corp., All Rights Reserved.
Updated July 2003