B-28 W650 Wind Generator Protection System GEK-113032A
B.6 EVENTS STATUS REQUEST (ALARMS) APPENDIX B
B
B.6.8 TIME SYNCHRONIZATION
Time synchronization consists of setting of relay date and time.
It may be supposed that is similar to a usual settings group writing but it has particularities:
- It is a data type very particular because it is made up of other simples.
- Once the data is changed, varies with time, it is a changing setting that can be read.
- It shares the time change with the IRIGB (this has more priority) and with a possible modification from MMI or another
protocols.
- In case of the relay gets disconnected from its auxiliary power supply, during some days, the time will remain in a
chip, feed by a capacitor (it does not need maintenance).
- And last, there are synchronism between the real time chip and the microprocessor time.
Time synchronization is made by a reading message over 0xfff0 address, either with the address of a single relay, if a
writing confirmation is desired, or in broadcast, to synchronize several relays simultaneously.
Date/time format is unsigned double (8 bytes) in MOTOROLA format, which indicates the passed milliseconds from 1
st
of
January 2000.
Reading example:
[0xFE 0x03 0xFF 0xF0 0x00 0x04 0x60 0x21] ---------> RELAY
PC <---------- [0xFE 0x03 0x08 0x00 0x00 0x00 0x17 0x05 0xFA 0xD5 0xBA 0x2D 0x1D]
Synchronism example:
[0xFE 0x10 0xFF 0xF0 0x00 0x04 0x08 0x00 0x00 0x00 0x17 0x9B 0x53 0x3F 0x60 0xA4 0x2B] ---------> RELAY
PC <---------- [0xFE 0x10 0xFF 0xF0 0x00 0x04 0xE5 0xE2]
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