GE 8515-BI-PN PROFINET Scanner Module
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