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GE 8712-CA-NS Node services carrier, Profibus-DP LAN

From:ABB | Author:Wang | Time :2025-01-09 | 293 visit: | Share:

Once the Ethernet LANs are isolated,

SafetyNet Controllers can be removed and

replaced - with the local power supplies still

connected - even in Division 1, Class 2 or

Zone 2 hazardous areas.

Redundant Controllers

SafetyNet Controllers can be used in a

master - standby redundant configuration to

improve the availability of the safety

function, but this is not required for safety.

Redundancy is implemented by simply

inserting the new Controller in to the free

slot on the Controller Carrier.

The SafetyNet system will automatically

upload the required SafetyNet application to

the new Controller and initiate the

redundancy algorithms. Switching between

redundant Controllers on detection of a fault

is automatic and bumpless.

The standby Controller continually performs

the same processing, on the same data and

at the same time as the Master and the

results are routinely cross-checked. This

ensures that the Standby is always ready to

take over control from the Master. The

redundancy strategy employed is known as

"rendezvous redundancy".

The "Change State" button on the Controller

Carrier is used to switch a master to being

the standby in a redundant pair, to switch a

standby offline and to instruct an offline

standby Controller to synchronise itself with

the Controller and to enter standby.

If a SafetyNet Controller has entered the

“Failsafe” state, it can be brought out of this

state by use of the “Change State” button.

Serial communications

Each SafetyNet Controller provides two

serial ports - one of which is physically

connected via the Controller Carrier, the

other directly on the Controller itself. The two

ports can be configured to be entirely

independent, or can be made to work

redundantly, either as redundant

connections to the same serial link or as

redundant connections to redundant links.

When redundant ports of a single Controller

are configured as Modbus masters,

redundancy issues are handled

automatically by the SafetyNet Controller

(deciding when to switch to the standby port,

alarming failures in the standby).

When redundant ports of a single Controller

are configured as Modbus slaves and multidropped on a single serial link, the

SafetyNet Controller will again manage the

redundancy (deciding which port respond to

the Modbus master and alarming a fault in

the standby port).

When redundant Controllers are used, this

adds additional availability to the

arrangements above. It is not possible to use

the ports on the standby Controller as

additional serial connections.

♦ Certified for use in SIL 2 safety applications, according to

IEC 61508

♦ Comprehensive internal diagnostics provide basis for

safety architecture 1oo1D

♦ Optional redundancy with bumpless transfer for increased

availability

♦ Dual redundant high speed fault tolerant Ethernet LAN

♦ Two connections to serial devices

♦ On-line configuration and re-configuration

♦ Communicates with up to 64 I/O modules

♦ Communicates on peer-to-peer basis with other SafetyNet

and standard Controllers

♦ Can write to standard output modules without

compromising safety function

♦ Live maintainable and hot-swappable - even in Class 1,

Div 2 or Zone 2 hazardous areas

♦ HART pass-through of process and status variables

♦ Event logging up to 8000 events

♦ 12Vdc Controller power required from 8913-PS-AC

CONTROLLER SPECIFICATION

See also System Specification

LAN INTERFACE

Transmission medium.............100BaseTX or 10BaseT Ethernet™

Transmission protocol........................................SafetyNet P2P*

Transmission rates ........................................10 - 100 Mbits/s

LAN connector type (x2) .................................RJ 45 (8-pin)

LAN isolation (dielectric withstand)............................1500 V

Action on software malfunction ............Halt CPU / Reset CPU

* SafetyNet P2P is a modified form of Modbus™ certified as suitable

for use in SIL 2 safety related applications that require peer-to-peer

communication.

SERIAL INTERFACES (COM 1 & COM 2)

Transmission rates.....................1.2 – 115.2 kbits/s (async.)

Transmission standard.................................RS485 half-duplex

COM 1 connector (on carrier).............9-pin D-type connector (F)

COM 2 connector (on controller) .......9-pin D-type connector (M)

HAZARDOUS AREA SPECIFICATION

Protection Technique............................................EEx nL IIC T4

Location (FM and CSA) ...........Class 1, Div.2, Grps A,B,C,D T4

POWER SUPPLIES

Controller Power Voltage................12V dc (from 8913-PS-AC)

Controller Power Supply............0.4A (typical), 0.5A (max.)

System Power Supply......................................15mA (max.)

MECHANICAL

Module dimensions .....................69 (w) x 232 (l) x 138 (h) mm

Weight (approx.)..............................................................1.35kg

上一篇： GE 8725-CA......

下一篇： GE 8724-CA......

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