Rockwell Automation 1738 Assembly Connections for POINT I/O and ArmorPOINT I/O EtherNet/IP Adapters - Manual (Page 39)

Publication 1734-UM016A-EN-P - October 2010
1734/1738 I/O Module Assembly Information 33
Data Format
The POINT I/O products specify multi-byte data values in little endian
format. The term little endian refers to the ordering method in which:
• The least significant byte of a data item is ordered first.
• The most significant byte of a data item is ordered last
• All bytes in between are ordered sequentially, from least significant byte
to most significant byte.
Layout for 16 bit numbers:
TagName[Low Byte]
TabName[High Byte]
Layout for 32 bit numbers:
TagName[Low Byte]
TagName
1734-OE4C
1738-OE4C 4 point analog current output 123 72 4 8
1734-IT21
1738-IT21 2 point thermocouple input 103 46 8 0
1734-IR2
1738-IR2 2 channel, 2point RTD input 123 38 6 0
1734-IR2E 2 point enhanced RTD input 123 38 6 0
1734-IE2V
1738-IE2V 2 point analog voltage input 123 38 6 0
1734-OE2V
1738-OE2V 2 point analog voltage output 123 36 2 4
1734-SSI
1738-SSI POINT I/O synchronous serial interface 123 26 10 2
1734-232ASC
1738-232ASC POINT I/O RS232 ASCII interface 103 18 4…132
default = 24 4…132
default = 24
1734-485ASC
1738-485ASC POINT I/O RS485 ASCII interface 103 18 4…132
default = 24 4…132
default = 24
1734-ARM Address reserve N/A 0 1 0
POINT and ArmorPOINT Analog and Specialty I/O modules
Cat. No Description Configuration
Assembly
Instance Configuration
Size Produced Size Consumed Size