Comtrol Modbus TCP User Guide - Manual (Page 92)

92 - Appendix A. Programming the PLC via Concept DeviceMaster UP Modbus/TCP User Guide: 2000447 Rev. I
Read Serial Port Statistics via Read Holding Registers Message
A.2.2.5. Read Serial Port Statistics via Read Holding Registers Message
The following screen depicts a Read Holding Registers message used to retrieve the serial port statistics in
ladder logic.
Where:
SLAVEREG Refers to the serial port statistics address on the DeviceMaster UP (+1 for use with Concept).
NO_REG Set to 24 (size of statistics data in words).
NDR The done flag.
ERROR The error flag.
REG_READ
The destination address on the PLC to place the statistics data. (Must be at least 24 words in
length.)
STATUS The message status word.
AddrFld This contains the PLC Modbus/TCP slot/index and IP address of the DeviceMaster UP.