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Home >> GE >> GE 8724-CA-PS Intrinsically Safe module power supply carrier

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GE 8724-CA-PS Intrinsically Safe module power supply carrier

Fault Tolerant Redundant

LAN

The availability of Ethernet connections -

between SafetyNet and standard Controllers,

historian and asset management packages

and HMI stations - has a significant impact

on the effectiveness and availability of both

safety and control functions.

To maximise availability of the Ethernet LAN,

MOST SafetyNet Systems feature Fault

Tolerant Ethernet ports that monitor the

integrity of their local network and

automatically switch to an alternate path if

the existing path becomes unavailable. If

suitable Ethernet switches are used - such as

Moxa Industrial Ethernet Switches - they too

will monitor their local network and switch to

an alternative path when this is required.

Monitoring the local network paths - even

when they are not being used - allows the

system to report the loss of any failed paths

so that appropriate maintenance can be

carried out.

Moxa Industrial Ethernet

Switches

The Moxa Ethernet Switch range is

specifically designed for use in Industrial

applications that require high availability in

harsh environments, with a broad operating

temperature range (-40ºC to +75ºC, except

EDS-205: -10ºC to +60ºC) and hazardous

area mounting capability (Class 1, Div 2 or

Zone 2).

Two alternative topologies are shown in

figures 1 and 2. Which topology is preferred

will depend on the physical layout of the

entities on the LAN and local preferences.

Figure 1 shows a redundant Ethernet LAN,

with intra-LAN link whilst figure 2 shows a

single "Turbo Ring" that provides an alternate

means of ensuring Ethernet availability -

implemented in the Moxa EDS405 5-port

switch. If any part of the Turbo Ring fails,

communication is re-routed automatically

within 300ms. Further improvements to

availability can be achieved by putting in

place a second identical, "Turbo Ring" which

should be connected to the first ring by a

single intra-LAN link. This link would

normally be mounted in the control room.

The Moxa switches are available with either

all copper or a combination of copper and

fibre ports. For media conversion between

fibre and copper the MOXA IMC-101 can

be used. All the Moxa products (except the

EDS-205) have dual power supply inputs

and a relay output for user configurable

fault reporting.

Certification

The SafetyNet Controller is certified for use

in safety-related applications up to and

including SIL 2. The SafetyNet Controller

achieves this Safety Integrity Level with a

1oo1D architecture (i.e. it operates in

"simplex" mode, with correct operation

ensured by comprehensive internal

diagnostics). In such applications the

SafetyNet Controller is used in conjunction

with the 8811-IO-DC SafetyNet Digital

Input/Output Module and the 8810-HI-TX

SafetyNet Analog Input Module with HART*.

The SafetyNet Controller is mounted on its

dedicated Carrier 8751-CA-NS.

*First release of SafetyNet will not have full

HART capability.

Safe by design

The SafetyNet Controller has been designed

specifically for safety-related applications

and is certified on the basis of the excellence

of its design. It does not depend for its

certification on "proven in use" data.

Diagnostics

If the SafetyNet Controller's internal

diagnostics detect a fault that would prevent

the SafetyNet System from carrying out its

safety function, then it will initiate a

controlled shutdown. A controlled shutdown

has two objectives - firstly, to ensure that the

SafetyNet System enters its failsafe mode;

and secondly, to record sufficient data to

allow the reason for the shutdown to be

determined.

If a SafetyNet Controller enters a controlled

shutdown, then all communication with IO

Modules is stopped and - when the

programmed time delay for each IO module

has elapsed - they will enter their safe states.

System size

The SafetyNet Controller can interface with

up to 64 locally mounted, 8-channel IO

Modules - giving a total capacity of over 500

channels per node. The Ethernet LAN is

capable of supporting over 200 nodes,

giving a maximum theoretical capacity of

over 100 000 channels!

HART pass-through

SafetyNet Controllers can be configured to

allow transparent access to the process

variables and status information provided by

HART field instruments. HART data cannot

be used within the SafetyNet application (as

- for example - it does not employ

sufficiently rigorous data error detection

algorithms), but communication with such

devices can be achieved by using a "passthrough" command which does not involve,

nor interfere with, the safety application.

(The first release of SafetyNet will not have

full HART capability, contact MTL for further

information).

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