Siemens EH.75M.11. Especificaciones descargar pdf (Pagina 129)

T400 Controller Facilities Manual

667/EB/20200/000 Page 12-2 Issue 9

12.2.1 Synchronisation of Cableless Linking Equipment

Synchronisation of Cableless Linking Equipment (i.e. maintaining required offsets for

the running plan) in adjacent controllers can be achieved either by the UTC computer

or by operators locally adjusting the real time when no link to the UTC computer is

existing, or is not required.

The UTC computer can correct small errors in the real time clock by sending a

command at one of the following minute boundaries past an hour 8, 18, 28, 38, 48, 58.

This would correct the Real Time Clock if the error was no more than 29 secs (see

section 9.3.3(9.3.3(k))).

The UTC computer can set the real time in the controller to a pre-programmed system

time and the computer will send the control signal at the time which is programmed

(see section 9.3.3(9.3.3(j))).

In the absence of the computer system, adjacent controllers can easily and accurately

be synchronised by local operators setting the controller RTC to ‘system time’ using

one controller as the master reference. No other adjustments are necessary to

synchronise the controller to adjacent controllers running the current local co-

ordinated mode system plan. Thus, if an UTC computer is not used, a limited “urban

traffic control” strategy may be implemented using CLF plans to link controllers in an

area.

(See Appendix C of the “T400 Controller Handset Command List” for details of

synchronisation procedure.)

12.3 SWITCH FUNCTION SETTING

The event timetable is introduced by a Master timeclock timetable setting with a

function number of ‘2’ (see Figure 21.12). Following the function number 2 in the

MTC timetable will be a ‘Parameter’ number. This parameter number refers to a

combination of event switches which are required to be inoperative ‘0’ or operative

‘1’.

Thus, when the MTC invokes a timeswitch parameter, a combination of events may be

set operative or inoperative (see Figure 21.13).

In the event of a timeclock failure, all the timetable settings are set to their default state

(see section 12.3.1).

16 event switches are available to be defined (0-15), each one may be defined as any

one of the following event types:

(a) Switch an Input/Output Active/Inactive/Normal

An input or output will operate as normal until switched active or inactive by a

timetable setting. Switching it active will set it permanently active, while switching it

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