
840 USE 115 00 Version 1.0
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The MSTR Instruction
3.1 Introduction
All NOE 2X1 10 Quantum Ethernet web embedded server modules provide the
user with the capabilit
of transferrin
data to and from nodes on a Modbus Plus or
TCP/IP network throu
h the use of a special MSTR
master instruction
. All PLCs
that support networkin
communication capabilities over Modbus Plus and
Ethernet can use the MSTR ladder lo
ic instruction to read or write controller
information.
3.2 MSTR Description
The MSTR instruction allows
ou to initiate one of 12 possible network
communications operations over the network. Each operation is desi
nated b
a
code. The followin
table lists the 12 operations and indicates those that are
supported on an Ethernet TCP/IP network.
MSTR Operation Code TCP/IP Ethernet Support
Write data 1 supported
Read Data 2 supported
Get local statistics 3 supported
Clear local statistics 4 supported
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