K-WANG
8 Channel, 24 VDC, Non-Isolated I/O Module
For use with FB-8800 Safety Logic Solver
GE FANUC 8811-IO-DC Safety Discrete Input / Output
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 areas
Safety Discrete Input / Output
Part No. 8811-IO-DC
Environmental Classifications:
Class I, Division 2. Groups A,
B, C & D T4
EEx nA nL IIC T4
Temperature ranges:
-40°F (-40°C) to 158°F (+70°C)
(Max. Amb.)
Dimensions:
1.65 in (42 mm) width
Weight:
Net 7.4 oz (210 g)
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 configured 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
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