User manual

33002479 06 07/2008 125
4
Transferring Data Using
Communication Blocks
Overview
Introduction This chapter describes how to transfer data to and from nodes on a TCP/IP network
using communication blocks. You transfer the data using either a special MSTR
instruction (the Master instruction of the 984 Ladder Logic instruction set) or an IEC
Logic function. Operational statistics and error codes for reading and writing the
controller information are included.
What's in this
Chapter?
This chapter contains the following sections:
Section Topic Page
4.1 Communications Issues 127
4.2 IEC Data Transfer Functions 129
4.3 MBP_MSTR 146