Rockwell-automation T8110B/T8110 Trusted TMR Processor Instrukcja Użytkownika Pobierz pdf (Strona 27)

Trusted

TMR Processor T8110B/T8110

Issue 18 Feb 08 PD-T8110B/T8110 27

4.6.1. Reset Button

The fault Reset button clears all recorded faults, resets all fault counters and requests all modules to

do the same. Fault testing continues, and faults that are still present will be recorded again. The fault

reset can also be initiated from the Engineering Workstation by personnel who are authorised by the

appropriate passwords, to implement maintenance changes to a Trusted

System.

Note that although pressing the Reset button will make the system look healthy, it may erase faults that

take many hours to be recorded again. It is recommended to note the fault code (which appears at the

bottom of the HKEEPING board in each module’s complex equipment definition, see the module PD

and PD-8032B) before pressing Reset.

4.6.2. Maintenance Enable Keyswitch

The two position keyswitch is used to select the following modes:

In the ‘Run’ position: the memory is locked.

In the ‘Maintenance’ position: the keyswitch allows the download of application programs by the

Engineering Workstation, together with the appropriate access permission.

Note To prevent unauthorised use, the key can be removed with the keyswitch in either position.

4.7. Composite Scan Time Estimation (pre TÜV release 3.5)

The composite scan time for a Trusted

system represents the time required to read the input data,

solve the application logic, and write the output data. This sequence is repeated cyclically for as long

as the Trusted

system is executing an application. For convenience, the above cyclical sequence is

broken down into four discrete elements: central modules, input modules, output modules, and the

application. The estimated composite scan time is the sum of those four elements.

The calculations here apply to systems before TÜV release 3.5. At release 3.5 the execution times

have been significantly improved. For systems from release 3.5, refer to section 4.8.

4.7.1. Central Modules

The Central Module time is based on the number and type of central Trusted

modules. It is

calculated by multiplying the number of installed modules by the appropriate time factor, then adding

the results.

Module Type No. Installed Time

Standby TMR Processor Module x 4 ms

TMR Interface Module x 15 ms

Communications Interface Module x 4 ms

Central Module Total

• Run

• Maintenance

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 37 38

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Rockwell-automation T8110B/T8110 Trusted TMR Processor Instrukcja Użytkownika Strona 27