Rockwell Automation 1734-AENT POINT I/O EtherNet/IP Adapter Module - Manual (Page 144)

Publication 1734-UM011D-EN-P - May 2011
130 POINT I/O Module and RSLogix 5000 Software Controller Tag Reference
Transmit Record Number/ Receive Record Number / Length_Lo
Note that 7 data bits allows Transmit / Receive record Number of Length_Lo
values of 0…127, which RSLogix 5000 software does support in the signed
Short Integer data type SINT (-128…+127 range).
Note that 8 data bits allows Transmit / Receive record Number of Length_Lo
values of 0…255.
To enter values from +128…+255, use this conversion formula:
Desired Decimal Value - 256 = Entered Decimal Value.
As an example, for a Transmit / Receive record Number of Length_Lo
value of 128, 128 - 256 = -128