Communication
2.2 Modbus
25SICAM Q100, 7KG95xx, System Manual
E50417-C1040-C522-A8, Edition 09.2020
Accuracy of the Floating-point Numbers
The 32-bit floating-point numbers have a 23-bit mantissa. Integer numbers can be represented in the following
ranges without loss of accuracy:
• Binary: ±(1)111 1111 1111 1111 1111 1111
• Hexadecimal: ±FF FF FF
• Decimal: ±16777216
32-bit floating-point numbers are accurate to about 7 decimal digits. An accuracy of 4 decimal digits (0.2 mea-
suring error) is required for measuring alternating current quantities.
2.2.6.2 Data Type - Date/Time (Read and Write)
The Date/Time data type is used to transmit the local time. The following format is used:
Date/Time Status
10H set: Daylight saving time active
20H set: Date/time error: equivalent to FAIL bit, see Device Manual SICAM Q100, Time Synchronization.
Byte 1 (MSB)
Holding register 0065
Byte 0 (LSB)
Milliseconds (0 to 59 999)
...
...
Byte 3
Holding register 0066
Byte 2
Hours (0 to 23)
Minutes (0 to 59)
Byte 5
Holding register 0067
Byte 4
Month (1 = Jan. to 12 = Dec.)
Day (1 to 31)
Byte 7
Holding register 0068
Byte 6
Date/time status
Year (0 = 1900)
NOTE
For the time synchronization via Ethernet, Siemens recommends the use of NTP.
SYS_SICAM_Q100_US.book Page 25 Thursday, September 24, 2020 1:17 PM
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