INST.No.INE-863B KR2S
【
Communication Interface
】
Instruction Manual
-23-
(Table 2. Function codes)
Code
Function
Unit
MODBUS original function
(Reference)
01
Reading of digital (ON/OFF) setting value
1 bit
Reading the status of coil
02
Reading of digital input data
1 bit
Reading the status of input relay
03
Reading of analog setting value
16 bits
Reading the content of holding register
04
Reading of analog input data
16 bits
Reading the content of input register
05
Writing digital setting value
1 bit
Changing the status of single coil
06
Writing analog setting value
16 bits
Writing to single holding register
08
Transmission of received data (for
diagnosis)
Loop back test
16
Writing multiple analog setting values
Writing to multiple holding registers
1. Digital settings value
Parameters to change functions including record ON/OFF, marker text
record, etc.
2. Digital input data
Data of event activation status, etc.
3. Analog settings value
Various setting information.
Numeric values are in the range of 16 bits (-32763 to 32767).
4. Analog input data
Measurement data, instrument specification information, etc.
Numeric values in the range of 16 bits are outputted.
7-3-3
Data part
Data structures differ depending on the function codes. In case of requests from the master, they are
configured by a code number (relative numbers calculated from reference numbers mentioned hereafter)
of the target data for reading/writing and number of data, etc. Responses from the slaves are configured
by data requested by a command etc.
All basic data of MODBUS are 16-bit integers and existence of a mark is decided for each data. Therefore
real values of data like measured values are expressed by allocating a decimal place to a different address
or by normalizing with high/low values of a scale while the decimal place is fixed. This instrument adopts
the allocation method of the decimal place to a different address.
Caution
In the data part, there are specific numeric values such as input data allocated
as error data. When using such data, perform the error judgment of data first
and then combine them with decimal point data.
If such error data are combined with decimal point data first, they are judged
as normal data.
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Summary of Contents for KR2S
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