Rockwell-automation T8480 Trusted TMR Analogue Output Module - 40 Chan Manual de usuario descargar pdf (Pagina 31)

Trusted

Module T8480

Issue 13 Apr 10 PD-T8480 31

5.7. Transfer between Active and Standby Modules

The TMR Processor is responsible for managing a pair of I/O modules through an active/standby

changeover. The following rules apply to active/standby changeovers, though the TMR Processor and

not the I/O module enforces them:

Under normal conditions, an active/standby changeover will only occur if the new active module is

fault-free. Under some circumstances, it is desirable to be able to force a changeover to a known

faulted module. This can be accomplished by opening the Module Removal switches on the currently

active module and pressing the push-button reset on the TMR Processor. This will force the

changeover to proceed even if the new active module is not fault free.

•

The user must define the primary, and optionally the secondary, I/O module location for each

I/O module pair. Each primary module location must be unique and is defined as part of the

complex equipment definition within the IEC1131 TOOLSET

. Secondary module locations

can be unique or shared between multiple secondary modules and are defined within the

module’s section within the System.INI file. The system will automatically determine the

secondary module position if the primary module is installed and is operable.

• On initial start-

up, if the primary module is installed, it will become the active module by default.

If the secondary module has been defined within the System.INI file and no primary module is

prese

nt, and if the secondary module location is unique, the secondary module will become

the active module by default. If the secondary module is installed with no primary module

present, and the secondary module location is not unique (as in a SmartSlot conf

iguration),

then NO module for that module pair will become active.

•

In order for a module to become the active module, the TMR Processor will verify that the

module is the correct I/O module type and that both Module Removal switches are closed. At

this point the I/O module is configured and will be placed in the active state.

• A module in the active state should never be removed.

•

When a fault occurs on the active module, the TMR Processor will be informed. Once it

becomes aware of the fault, the TMR Processor will attempt an active/standby changeover.

•

.An active/standby changeover starts with the TMR Processor checking to see if a standby I/O

module is installed. If no standby I/O module is available, the TMR Processor will continue to

utilise the active

module and will continue to check for an available standby I/O module. Once

a standby module is found, the TMR Processor will verify that the I/O module is of the correct

type, that both Module Removal switches are closed, and that the I/O module is a par

t of the

correct module pair by using the SmartSlot link. At this point, the TMR Processor will

configure the standby I/O module with the same configuration information as the currently

active I/O module and place the standby I/O module into the standby s

tate. The active module

is then placed in the maintain state (which suspends field loop testing), and any module

specific changeover data is transferred. The educated light flashes amber before the

active/standby changeover takes place, to indicate trans

fer of dynamic change over data

(COD). The previous standby module then becomes the active module and the original

module becomes standby. If the currently active module does not successfully complete the

self-tests, the TMR Processor will revert it to t

he standby state, and the module in the maintain

state will revert back to the active state.

•

When both Module Removal switches are opened on an active module, regardless of the

module fault status, the TMR Processor will treat it as a request to perform an

active/standby

changeover.

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