3.5 IRIG-B Clock Synchronization (Function Group IRIGB)
If, for example, a GPS receiver with IRIG-B connection is available, the internal
clock of the P634 can be synchronized to run on GPS time using the optional
IRIG-B interface. It should be noted that the IRIG-B signal holds information on
the day only (day of the current year). Using this information and the year set at
the P634, the P634 calculates the current date (DD.MM.YY).
Disabling and Enabling the IRIG-B Interface
The IRIG‑B interface can be disabled or enabled using a setting parameter.
Synchronization Readiness
If the IRIG-B interface is enabled and receiving a signal, the P634 checks the
received signal for plausibility. Implausible signals are rejected by the P634. If
the P634 does not receive a correct signal in the long run, synchronization will
not be ready any longer.
47Z02BAA
IRIGB:
Enabled
[ 023 201 ]
IRIGB:
General enable USER
[ 023 200 ]
IRIGB:
Synchron. ready
[ 023 202 ]
Fig. 3-20: IRIG‑B interface.
P634 3 Operation
3-34 P634/EN M/R-42-A // P634‑311‑653
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