Rockwell Automation 2711 MODBUS COMMUNICATIONS FOR PANELVIEW TERMINALS - Manual (Page 24)

Publication 2711-6.9 - March 2000 24 40061-386-01(B)
Supersedes Publication 2711-6.9 - October 1997 © Copyright 2000 Rockwell International Corporation. Printed in the U.S.A.
Glossary Coil
Bit location in a a Modbus device.
Digital Tag
A bit address.
Inputs
Data which is received by the logic controller from other devices.
Master
Device which sends messages (queries) to one or more slave devices.
Modicon Controller
Refers to the 184/384, 484, 584, 884, M84 (micro), or 984 family of
Modicon logic controllers.
Outputs
Data which is sent by a logic controller to other devices.
Register
16 bit unsigned value residing in a Modbus device.
RTU
Acronym for Remote Terminal Unit, one of 2 possible transmission
formats supported by Modbus. PanelView terminals only support
RTU.
Slave
Device which receives queries from the master and provides a
response.