Bender ISOMETER isoBAT425, Manual

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Modbus register assignment of the ISOMETER® Modbus register assignment of the ISOMETER®
isoBAT425_D00308_04_M_XXEN/07.2020
27
8.1 Device-specific data type of the ISOMETER®
8.1.1 Device name
The data format of the device name is specified below.
8.1.2 Measured values
Each measuring value is available as a channel and consists of 8 bytes (4 registers). The
first measuring value register address is 1000. The structure of a channel is always identi-
cal. Content and number depend on the device. The structure of a channel is shown with
the example of channel 1:
8.1.2.1 Float = Floating point value of the channels
Presentation of the bit order for processing analogue measuring values according to IEEE
754
S = Sign
E = Exponent
M = Mantissa
Word
0x00
0x01 0x02 0x03 ------------------- 0x08 0x09
10 Words in total
Each Word contains two ASCII characters
1000 1001 1002 1003
HiByte LoByte HiByte LoByte HiByte LoByte HiByte LoByte
Floating point value (Float)
Alarm type and
test type
(AT&T)
Range and
unit (R&U)
Channel description
Wo
rd
0x00 0x01
Byt
e
HiByte LoByte HiByte LoByte
Bit
31 30 24 23 22 16 15
8 7
0
S E E E E E E E E M M M M M M M M M M M M M M M M M M M M M
M M
8.1.2.2 AT&T = Alarm type and test type (internal/external)
The alarm type is coded by the bits 0 to 2. Bits 3, 4 and 5 are reserved and always have the
value 0. Bit 6 or 7 is usually set when an internal or external test has been completed.
Other values are reserved. The complete byte is calculated from the sum of the alarm type
and the test type.
Bit 7 6 5 4 3 2 1 0 Meaning
T
e
st
e
x
tern
al
T
e
st
in
tern
a
l
Reser
v
ed
Reser
v
ed
Reser
v
ed
Al
a
rm
Fa
u
lt
Alarm t
y
pe
X X X X X 0 0 0 No alarm
X X X X X 0 0 1 Prewarning
0 0 X X X 0 1 0 Device error
X X X X X 0 1 1 Reserved
X X X X X 1 0 0 Warning
X X X X X 1 0 1 Alarm
X X X X X 1 1 0 Reserved
X X X X X … … … Reserved
X X X X X 1 1 1 Reserved
Te
st
0 0 X X X X X X No test
0 1 X X X X X X Internal test
1 0 X X X X X X External test