8811-IO-DC
FIREBUS 8811-IO-DC Safety Discrete Input / Output
8 Channel, 24 VDC, Non-Isolated I/O Module
For use with FB-8800 Safety Logic Solver
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.
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.
Line fault monitoring
In addition to the comprehensive internal diagnostics the SAFETY I/O Modules can monitor field wiring for line faults.
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 areasFireBusSystems
Power Supplies:
Wide range power supplies,
85 - 264 AC input
24 DC output
8914-PS-AC for field 24 VDC
Redundant power supplies can be implemented by “pairing” supplies, this is not required for
the certified safety integrity level, but will improve availability.
Operating current:
System power,
50 ma (typical)
70 ma (max)
Bussed Field Power, All channels configured as inputs
50 ma (max)
Any channel configured as
output 50 ma + output load
General Module Parameters
Number of channels,
8 Independently con-
figured as inputs or
outputs
Response time of input change to availability to system,
5 ms (max.)
System command to output change,
1 ms (max.)
Inputs:
ON/OFF threshold current
0.9mA (typ.)
O/C Voltage . . . 24V dc (typ.) depends on BFP Supply
Wetting current :
1.2mA (typ.)
Min. pulse width detected:
5ms
Max input frequency in pulse counting mode (no debounce)
30Hz
Isolation:
250V AC
(any channel to
Railbus)
Configurable Parameters
Filter time interval:
0 to 8s (1ms steps)
Earth Ground Fault Detection Channel,
ON/OFF
Latch inputs,
enable /disable
Latch polarity,
latch on high
latch on low
Pulse counting,
up transition
down transition
disable
Line fault detection,
none
open circuit
open & short circuit
Outputs:
Output Current per Channel Continous,
2A
Output Current per Module Continuous,
6A
Non-continuous (<10 seconds),
8A
Configurable Parameters
Output type,
pulse
discrete
pattern
Pulse width,
1ms to 60s
Line fault detection*,
open circuit detect
short circuit detect
open circuit disable
short circuit disable
* Normally de-energised only
Delivery:
Warranty:
All our products are covered by our own warranty.
Payment method:
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