Comtrol Modbus TCP User Guide - Manual (Page 89)

DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I Appendix A. Programming the PLC via Concept- 89
Transmit Serial Data via Write Multiple Registers Message
A.2.2.2. Transmit Serial Data via Write Multiple Registers Message
The following screen depicts a Write Multiple Registers message used to transmit raw serial data in ladder
logic.
Where:
SLAVEREG Refers to the port transmit data address (+1 for use with Concept).
NO_REG
The maximum receive message size in 16 bit words. The maximum size of 100 includes
two words for the sequence number and length and then up to 196 bytes of serial data.
REG_WRIT
The memory location where the data message to transmit resides on the PLC. (This
includes the sequence number, length in bytes, and serial data to transmit.)
DONE The done flag.
ERROR The error flag.
STATUS The message status word.
AddrFld This contains the PLC Modbus/TCP slot/index and IP address of the DeviceMaster UP.