S900 I/O

S900 is a remote I/O system for mounting directly in the field and hazardous areas.

S900 provides all input and output modules needed for intrinsically safe field signal connection. The field signals are amplified in every S900 functional module, electrically isolated, and then output via an internal serial bus. A communication interface converts the digitized signals to adapt them to the standardized PROFIBUS DPV1 fieldbus protocol. Supervisory process control systems, DCS or SCADA systems use an intrinsically safe fieldbus to communicate with the communication interface.

A single fieldbus network suffices for configuring the individual fieldbus nodes, for cyclic data exchange, for all acyclic services, and for communication with HART®-compatible field instruments. All functional modules can be replaced easily and quickly in the installation or maintenance phase. The functional modules and the – optionally redundant – communication interfaces of systems placed in Zone 1 can be removed and plugged in while operation is running, without affecting the communication of the remaining modules. Only the primary power for the plug-in type power supply modules requires increased safety EEx-e.

Integrated encapsulated switch-off mechanisms allow for hotswapping, i.e. the power supply units can be replaced without interrupting the primary power. Due to its little space requirements and robust design and its environmentally ruggedized case, the I/O system S900 is the best, cost-saving solution for use on site, in hazardous Zone 1 or Zone 2 areas.


Service and Support


For S900 there is a DTM available. You may download it from SolutionsBank: http:\\solutionsbank.abb.com

If you do not have access, do not hesitate to contact us.


For S900 there are GSD files available. You may download it from SolutionsBank: http:\\solutionsbank.abb.com

If you do not have access, do not hesitate to contact us.

It is our goal to provide the services and programs required to protect our customer’s control system investment throughout its lifecycle. From initial design, engineering and startup services, through maintenance and optimization to upgrade and evolution, we provide the programs, services and commitment necessary to ensure maximum return on investment for your system.

These valuable lifecycle programs include:

  • System Updates
  • Lifecycle Policy
  • Automation Sentinel
  • Evolution
  • Services:
    Reliablility, Full Service, Performance Services, Product Service, Remote Services
  • Solutions Bank
  • Consult IT

Ready-made, EExi/ATEX-certified high-grade steel housings and the CB220 Compact Box for assembly in the field provide a wide range of installation options.

Field housings – for wall-mounting in the case of installation in Zone1 with a system approval fully certified in accordance with ATEX. The stainless steel field housing is ready-wired and prepared for wall-mounting. In addition, screen rails or terminals can be mounted. Together with the field housing, this brings the following advantages:

  • Complete design, heat compensation, and documentation by ABB
  • Elimination of additional marshalling units
  • Thanks to the S900 modules, no external barriers are needed for the field circuits
  • Simplified acceptance of the plant with regard to hazardous areas

CB220 compact box – S900 remote I/O in compact form with up to 4 I/O modules for decentralized use in a compact housing. This variant is suitable, for example, for use in applications such as temperature multiplexers and solenoid controls. The CB220 compact box additionally offers the following advantages:

  • Compact design
  • Easy field assembly
  • Decentralized assembly makes it possible to cut down on wiring
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