Honeywell 10006/2/1 Channel isolation module

Buffered real–time clock The system software from version G01 onwards uses the buffered real–time clock. The system software sets the AS time or the internal clock of the microprogram to the time of the buffered real–time clock with each system startup. The startup program checks the functions of the buffered real–time clock each time the system is started. A faulty clock is signalled by the I & C message SYST CLOCK S 305. When the system software is booted, the real–time clock is set with the date of the system software generation, and the clock set to 0 o’clock. The real–time clock is only readjusted when the day changes from Monday to Tuesday, when the input ”DA,...;” is made for the date adjustment or the input ”UZ,...;” for the time setting. Both clocks are set when the date or time is entered.

If the power supply fails

 the buffered real–time clock stores the failure time. When the power supply returns, the startup program imports the current time and date from the buffered clock and resets the AS time and the internal clock of the microprogram. The time of the power failure, the time of the power supply return and the difference (failure time) are determined by the startup program and stored in system interfaces in the FSA.ORPA. The function of the real–time clock is checked at midnight. If it has failed in the meantime, this is signalled by the I & C alarm SYST UHR S 305.

Synchronization 

All devices connected to the bus can be supplied with the current time and date from a central location. Three different options exist: 1. A process computer every 2 hours 2. An N clock (master clock) every 10 s 3. An operator communication and monitoring system every minute A synchronization message, which is sent to all devices, contains: 1. Date (day, month, year) 2. Time (hour, minute, second, millisecond) Each synchronization occupies the AS 235 subsystem for approx. 1.3 ms. Synchronization is performed on processing level 7 (with status change inhibit). The day of the week is computed from the data.

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