Modbus Register Assignment; Modbus Measured Value Registers - Bender ISOMETER isoCHA425HV Manual

Data access via RS-485 interface
5.3

Modbus register assignment

5.3.1

Modbus measured value registers

Depending on the device condition, the information in the registers is the measured value without alarm, the
measured value with alarm 1, the measured value with alarm 2, or the device error. For more information see ,
page 35.
Register
1000...1003
1004...1007
1008...1011
1012...1015
1016...1019
1020...1023
1024...1027
1028...1031
1032...1035
( ) channel description code (see "Channel descriptions", page 37)
5.3.1.1 Measurement coding
Each measured value is available as a channel and consists of 8 bytes (4 registers). The first measured value
register address is 1000. The structure of a channel is always the same. Content and number depend on the
device. The structure of a channel is shown with the example of channel 1:
1000
HiByte LoByte
Floating point value (Float)
34 isoCHA425HV_D00404_04_M_XXEN/10.2023
Without alarm
R
F
Insulation fault (71)
U
n
Voltage (76)
C
e
Capacitance (82)
U
L1e
Voltage (76)
U
L2e
Voltage (76)
Fault location in %
(1022)
R
FU
Insulation fault (71)
Measured
value update
counter (1022)
1001
HiByte LoByte
Measured value
Alarm 1
[prewarning]
R
F
Insulation fault (1)
U
n
Undervoltage (77)
[alarm]
1002
HiByte
Alarm type
and test
type (AT&T)
Alarm 2
[alarm]
R
F
Insulation fault (1)
U
n
Overvoltage (78)
LoByte HiByte
Range and
Channel description
unit (R&U)
Device error
Earth
connection (102)
Connection to
system (101)
Device error (115)
1003
LoByte