Measurands - Siemens 7SR45 Argus User Manual

4.4

Measurands

The following measurands EVT and INF numbers apply to this device.
FUN INF
183 148
NOTE:
In the IEC103, message frames are separated by a silent interval of at least 3.5 character times. This
time interval is also called t3.5. This t3.5 delay needs to be provided by the IEC103 master for
response to another query.
7SR45 Argus Relay follows the below equation for satisfying the silent interval time.
tdelay required = 11 x 3.5/b
Where,
11 = bits
b = baud rate in bps
tdelay for 7SR45 = tdelay required + 10 ms tolerance
RTS
TXD
tp
tp ...... Pause time (pause before "RTS = ON")
tv ...... Setup time (transmission delay after "RTS = ON")
tn ...... Hold Time (pause time after sending before "RTS = "tOFF")
ts ...... Hold receiver disabled after "RTS = OFF"
rdis ...... Disable receiver when using half duplex protocol
Note: Only active when "ts = 0"
tp or ts must be equal to tdelay for 7SR45.
© 2018 Siemens Protection Devices Limited
Description
Measurand IL1,2,3
IL1 (2.4x)
IL2 (2.4x)
IL3 (2.4x)
Data transmission
tv
Figure 2-3 Time Settings for Message Frame
Chapter 4 - 7SR45 Data Communications Definitions
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tn
rdis
ASDU COT
Cyclic -
9 Refresh
rate 5 s
ts
Chapter 4 Page 11 of 20