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Analog Values – Safe and Standard

Standard Analog Input and Output Modules up to IP67

Our analog input and output modules let you control many different connected sensors and actuators, so that a variety of applications are now available.

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Our analog modules can read or write analog signals. They are available in protection ratings from IP20 to IP67 for any ambient conditions.

Analog control, e.g. with:

  • ƒ0 … 20 mA ƒƒ
  • 0 …10 V


Connection options for various sensors:

  • 4 ... 20 mA ƒƒ
  • 0 … 10 V ƒƒ
  • Pt100 ƒƒ
  • Pt1000 ƒƒ
  • Type J and Type K thermocouples ƒƒ
  • Balance cell controllers

Safely Monitor Analog Signals

With our AS-i Safety modules for analog inputs you can safely monitor and evaluate analog process variables such as temperature, pressure or speed. In addition to various encoders, thermocouples and temperature sensors, voltage and current values can also be monitored.


The modules safely report (up to SIL 3) whether the input signal (such as temperature or distance) is within freely configurable ranges.

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Examples for Safety Functions



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Application Example: Safe Temperature Monitoring

The model BWU3271 AS-i Safety thermocouple monitor safely monitors temperatures from thermocouples, such as in industrial ovens. These values can also be sent over the fieldbus to the host controller for processing.


Temperature monitoring can provide a switching signal if desired. In addition, the temperature values themselves can be queried. The temperature for monitoring can be easily configured using ASIMON360. When conditions change, the thermocouples can also be adjusted and calibrated accordingly.

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Safety thermocouple module details:

  • Monitors type J, K, N, R, S thermocouples ƒƒ
  • Meets EN 746-2, Par. 5.7.2.b for use in thermal process equipment ƒƒ
  • Safety temperature limiter and monitor with overtemperature shutoff of an industrial oven per SIL 3 / PLe (Machine Directive DIN EN ISO 13849-1 PLe)
  • Highly accurate transmission of calibratable process values over gateways to the higher level control system ƒƒ
  • Chip card for simple device replacement ƒƒ
  • Safely (up to SIL3) send switching thresholds to the controller, e.g. through the PROFIsafe gateway

Application Example: Safe Distance and Position Monitoring

Easily read signals from analog distance sensors with our analog input modules, or encoder signals using our speed monitor. Now you can simply and safely monitor and process positions, distances or speeds. The safe ranges can be easily defined using our ASIMON360 configuration software.


The illustration below show an example of safe distance and position monitoring on a driverless transport system. Safe Link can be used, for example, to safely send the result of the distance and position monitoring over WLAN to a fixed base station. In addition, the base station can send safe signals to the driverless transport system to turn it off in emergency situations.

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Application Example: Safe Speed Monitoring

The Bihl+Wiedemann speed monitors provide an efficient means of safely processing encoder signals. For example you can monitor a safely reduced speed for setup mode.

Safe speed monitors for encoders:

  • Monitor up to 2 axes, up to SIL3, PLe
  • For sine/cosine, SSI, TTL or HTL-Encoder
  • Detailed diagnostics and shut-off history via software
  • Chip card for easy device exchange
  • 22.5 mm width

Devices with local safe outputs:

  • 2 safe electronic outputs
  • Support of all safety functions acc. EN 61800-5-2
  • Any number of safety functions can be implemented
    • Possibility to configure several functions or same function with different parameters for each axis
    • Max. 128 devices configurable

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Other Safety Functions for EN 61800-5-2 Drives

Following are additional safety functions you can easily carry out using analog modules from Bihl+Wiedemann:

Simple Configuration in ASIMON360

Using ASIMON360, the configuration software from Bihl+Wiedemann, safe analog modules can be very simply configured with graphical assistance.

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Configuration made easy:

  • Drop-down for safe range selection
  • Several ranges can be defined for each module
  • Graphical assistance in configuration
  • Hardware catalog for simple module selection

Questions about our products and solutions?