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All Rights Reserved. Copyright © 2000, Yokogawa Electric Corporation
TI 04L01A01-02E
Supported functions of the MODBUS
The following MODBUS communication functions are supported by the DX100/200.
FC code
Function
Operation
3
Read the hold register (4xxxx)
Read communication input data
4
Read the input register (3xxxx)
Read the measurement, computation, time data
8
Loopback test
Message return
Supports only (diagnosis code 0x00)
16
Write to the hold register (4xxxx)
Write communication input data
MODBUS Register Assignment
Address
Data
30001
CH01 measured data
30002
CH02 measured data
:
30030
CH30 measured data
31001
CH01 measured data alarm status
31002
CH02 measured data alarm status
:
31030
CH30 measured data alarm status
32001
CH31 computed data (MSB)
32002
CH31 computed data (LSB)
32003
CH32 computed data (MSB)
32004
CH32 computed data (LSB)
:
32059
CH60 computed data (MSB)
32060
CH60 computed data (LSB)
33001
CH31 Alarm status of computed data
33002
CH32 Alarm status of computed data
:
33030
CH60 Alarm status of computed data
39001
year (four digits)
39002
Month
39003
Date
39004
Time
39005
Minute
39006
Second
39007
Msec
39008
Summer time / winter time
40001
C1 Digital data
40002
C2 Digital data
:
40030
C30 Digital data
Because the register values do not include the unit and the decimal position information, the MODBUS
master must know beforehand the unit and the decimal position.