S900 I/O for ABB Freelance DCS

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

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
  • Value for your money: Integrated galvanic isolated barrier function reduces the need for additional barriers
  • Simplified maintenance thanks to auto-diagnostics and the availability of diagnostic data via the fieldbus or locally at the S900 I/O station
  • Easy configuration using FDT/DTM or GSD files

We focus on industrial automation and process instrument over 20 years

S900 I/O for ABB Freelance DCS

S900 I/O communicates with the control system level using the Profibus standard.
The I/O system can be installed directly in the field, therefore the costs for marshalling and wiring are reduced.

The system is sturdy, error-tolerant and easy to service. Integrated disconnection mechanisms allow replacement during operation, meaning that there is no need to interrupt the primary voltage in order to exchange the power supply units.

S900 I/O features include:

  • Remote I/O system for hazardous areas
  • Redundancy for maximum availability
  • Hot-swap capability of all components during operation
  • Extended diagnostic functions to reduce maintenance efforts

Analog Input (4 channels)

Description Non Ex Ex Zone 2 Ex Zone 1
Transmitter power supply,
Analog Input
4…20 mA
S900-AI910N S900-AI910B S900-AI910S
Transmitter power supply,
Analog Input, HART
4…20 mA
S900-AI930N S900-AI930B S900-AI930S
Passive Analog Input, HART
0/4…20 mA
S900-AI931N S900-AI931B S900-AI931S

Analog Output (4 channels)

Description Non Ex Ex Zone 2 Ex Zone 1
Analog output
0/4…20 mA
S900-AO910N S900-AO910B S900-AO910S
Analog output, isolated
0/4…20 mA
isolated outputs channel by channel
S900-AO920N S900-AO920B S900-AO920S
Analog output HART
0/4…20 mA
S900-AO930N S900-AO930B S900-AO930S

Digital Input/Output

Description Non Ex Ex Zone 2 Ex Zone 1
Digital Output for I.S. valves
(4 channels)
S900-DO910N S900-DO910B S900-DO910S
Digital Input or Output
input for dry contact or NAMUR initiator
output for low power I.S. valves
(8 channels)
S900-DX910N S900-DX910B S900-DX910S
Relay module for digital signals
(6 channels)
S900-DO930N none none

Temperature (4 channels)

Description Non Ex Ex Zone 2 Ex Zone 1
Pt100, Pt1000, Ni100 in 2-/3-/4-technology thermocouples type B, E, J, K, L, N, R, S, T
isolated inputs channel by channel
S900-AI950N S900-AI950B S900-AI950S

Frequency Input (2 channels)

Description Non Ex Ex Zone 2 Ex Zone 1
input for dry contact or NAMUR initiator S900-DP910N S900-DP910B S900-DP910S

Communication Modules

Description Non Ex Ex Zone 2 Ex Zone 1
Communication Interface
S900-CI920N S900-CI920B S900-CI920S
Intrinsically safe PROFIBUS-DP connector standard connector S900-BP910S S900-BP910S