Chapter 4 - 7SR120 · Data Communications Definitions
© 2017 Siemens Protection Devices Limited Chapter 4 - Page 33 of 84
Byte 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Content 2 0 FUN INF DPI RT L
RT
H
F# L F# H 0 0 0 ms L
ms
H
Mi Ho
Event Type 2 Format.
Byte 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Content 4 0 FUN INF Meas 0 0 0 0 ms L
ms
H
Mi Ho
Event Type 4 Format.
4.2.6 EVENTCOUNT
The EVENTCOUNT register contains the current number of events in the relay's event buffer.
On reception this register should be interpreted as a 16 bit integer.
4.2.7 TIME_METER
The TIME_METER register contains the device's time. The time must be read or written in one step;
therefore the quantity should be 4 registers. Failing to do this will result in an exception code 2. The
time format is 8 bytes as follows.
The following table describes the fields in the time.
Key Description
ms L Time Stamp Milliseconds low byte.
ms H Time Stamp Milliseconds high byte.
Mi Time Stamp Minutes (MSB = invalid, time not set > 23 hours).
Ho Time Stamp Hours (MSB = Summer time flag).
Da Time Stamp Days.
Mo Time Stamp Months.
Ye L Time Stamp Years low byte.
Ye H Time Stamp Years high byte (Not Used).
The following table shows the fields in the time as they are returned.
Byte 0 1 2 3 4 5 6 7
Content ms L ms H Mi Ho Da Mo Ye L Ye H
Time Format.
4.2.8 STR32 & STR64
4.2.9 BITSTRING
A Bit-String (or Bit-Array) is a method of compactly storing a number of bits of data. In this instance we store
up to 16 bit values, for example the states of binary inputs, in a single 16 bit register. The first bit value is
stored in the Least Significant Bit (LSB) of the register. The 16
th
value would be in the Most Significant Bit
(MSB). Bit values can only be zero or one. Any unused bits will be set to zero.
BITSTRING & MODBUS
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