GE FB-8800 SAFETY I/O Modules

GE  FB-8800 SAFETY I/O Modules

Overview

SAFETY I/O Modules for the FB-8800 SLS interface  to safety system field wiring via Field Terminals. The  I/O Modules and the Field Terminals mount on Carriers  that provide mechanical support, but also connect the  internal communication bus and power supply connections to the Modules. The I/O Modules are certified as  suitable for use in SIL 2 safety-related applications and  approved by TÜV with a basis of testing including EN54- 2 and NFPA-72 among others.

Certification

These SAFETY IO Modules have been designed specifically for safety-related applications and are certified on  the basis of the excellence of their design. The certification does not depend on “proven in use” data.

Diagnostics

The I/O Modules perform comprehensive internal diagnostic tests as an essential part of ensuring that the  I/O can carry out the required safety function. If the  FB-88XX I/O Module’s internal diagnostics detect a  fault that would prevent the SLS from carrying out its  safety function, then it will initiate a controlled shutdown.  A controlled shutdown has two objectives – firstly, to  ensure that the I/O Module enters its failsafe mode; and  secondly, to record sufficient data to allow the reason for  the shutdown to be determined. If a SAFETY I/O Module  enters a controlled shutdown, then all I/O channels are  deactivated: input channels are not scanned; and output  channels are de-energised.

Bussed Field Power

The Bussed Field Power (BFP) connectors on the rear of  I/O Module Carriers provide the power connections for  field instruments wired to the IO Modules. BFP must be  24V DC and these power supplies can be used in redundant pairs, if required.

Key Features

• Certified for use in SIL 2 applications (IEC 61508) 

•  8 Channels, any combination of inputs & outputs 

• Non-arcing inputs & outputs 

• Output channels rated up to 2A continuous 

• Inputs for dry contact switches 

•  Field wiring supervision 

• Hot-swappable maintenance even in Class 1, Div 2 or Zone 2 hazardous areas

Live maintenance

SAFETY I/O Modules can be removed and replaced in a  Class 1, Division 2 or Zone 2 hazardous area - once the  relevant Bussed Field Power (BFP) connection has been  isolated using an appropriate hazardous area switch.  Removing and replacing the Modules does not interrupt  the operation of the other parts of the node. If a Module  is replaced by another Module of identically the same  type, then no intervention is required for the System to  begin operating normally once the Bussed Field Power is  restored.