Table 12: Time structure data
Address Register Values Comment
N TimeStamp
(Year,Month)
High byte:year, low
byte:month
N+1 TimeStamp (Day,Hour) High byte:day, low
byte:hour
N+2 TimeStamp (Min,Sec) High byte:min, low
byte:seconds
N+3 TimeStamp
(Milliseconds)
Word: milliseconds
N+4 Time quality See the table about
time quality register
Table 13: Time quality register
Bit Meaning Values
15 Time format 0 = Local time
1 = UTC time
14 Time source 0 = Internal (RTC)
1 = Modbus stack
13 RTC not synchronized 0 = RTC synchronized
1 = Not synchronized
12 RTC Failure 0 = RTC OK
1 = RTC failure
11...0 Not used 0
3.4.5.7 Register configuration
Measurand registers are mirrored on both 3x and 4x Modbus register areas. Registers
can be accessed in the Modbus Communication Management tool in PCM600, under
tabs: 3x – input registers and 4x – holding registers.
Register values are received from the IEC 61850 system level in two formats.
Measurands are usually received as floating point values and counters as integer
values. The Modbus register values are always presented as integer values. To make
the source floating point value decimals visible in the Modbus register, the received
IEC 61850 value can be multiplied with, for example, values 10, 100 or 1000. The
Modbus register rounds the integer part and truncates all decimals that are left in the
source value.
Section 3 1MRS757645 B
Vendor-specific implementation
30 620 series
Communication Protocol Manual
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