GE FANUC 8811-IO-DC Safety Discrete Input / Output

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