Eaton EU5C-SWD-EIP-MODTCP - Smartwire-DT Input;Output Data

7 Modbus/TCP – SmartWire-DT implementation
7.2 SmartWire-DT input/output data
SmartWire-DT Gateway EU5C-SWD-EIP-MODTCP 08/17 MN120003Z EN www.eaton.com 75
7.2 SmartWire-DT input/output data
Registers 0x1012 and 0x1013 on ￫ Table 23, page 74 contain the length of
the SmartWire-DT modules' input/output data. This length is defined in bits.
Padding bytes are included.
The gateway mapping assignment version is provided via access to register
0x1017.
The SmartWire-DT modules' data is transferred to the Modbus registers for
cyclic input/output data after the byte data. The volume and description of
the input/output data depend on the specific characteristics of the Smart-
Wire-DT modules being used. These characteristics are described in the
"SmartWire-DT Modules IP20", MN05006001Z.
The input data consists of status information regarding the modules, as well
as process data. Status information includes, for instance, information con-
cerning the validity of data. Process data, meanwhile, can include data such
as the contactor state of an M22 control device or analog values correspond-
ing to a SmartWire-DT module. The SmartWire-DT modules' data (byte or
word format) is allocated to Modbus registers in the SWD-Assist planning
program.
Normally, the modules' data is allocated continuously to the word registers.
When there are byte variables, the first byte is stored in the (word) Modbus
register's high byte, while the second byte is stored in the low byte.
Rules for distributing SmartWire-DT module data across Modbus regis-
ters
If input data of data type "byte" is followed by additional input data of data
type "WORD," an additional padding byte will be inserted before the last data
type if the number of "byte" data types is odd. This is in order to make it pos-
sible to store word variables completely in a Modbus register.
Examples
3 input data instances of data type "byte" and 1 input data instance of data
type "word"
2 input data instances of data type "byte" and 1 input data instance of data
type "word"
MODBUS register High byte Low byte
n 1 Byte Byte 2
n+1 Padding byte bytes3
n+2 Input word
MODBUS register High byte Low byte
n 1 Byte Byte 2
n+1 Input word