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21.6.7 Read Alarm Setpoint Values
The alarm setpoints can be read from either Input Registers (3x) or Holding Registers (4x). The value
can be read as a 32-bit floating point value, or as a scaled value (0-65535). B&K Vibro recommends
using the floating-point value if it is supported by your DCS system.
The alarm setpoint values are ‘read only’ and do not change when Trip Multiply is enabled.
Format Description
32-bit floating point
Alarm setpoint is read in actual engineering units
(i.e. 2.5 mils)
16-bit unsigned integer
Alarm setpoint is read as a scaled value
(percentage). For example:
Alarm setpoint = 2.5 mils,
Measurement range is 0 to 10 mils
(2.5 mils = 25%),
Modbus range = 0-4095.
Modbus Value (25%) = 1023.
Table 21-5) Alarm setpoint registers
Data provided as 32-Bit Floating point values use two 16-bit registers. The word order can be
swapped (see section 21.3.5)
21.6.8 Read Rack Time
The rack time can be read as an epoch timestamp; and is the number of “ticks” that have elapsed
since January 1, 1970 at midnight, where 1 tick equals 100 nanoseconds (10-7 seconds).
Format Description
16-bit unsigned integer
Rack (system) time read as an epoch timestamp.
Table 21-6) Rack time register
There are various converters on the Internet to convert a Unix hexadecimal timestamp to a human
readable date (i.e. epochconverter.com).
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