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Chapter 4 Operating Procedures
for the DN311 (Software)
This chapter describes the items necessary for using the various functions of the DN311
in S controller ladder programs as follows:
(1) DN311 registration
In using the S controller with DN311s connected to it, it is necessary to register the
DN311s as target stations. The procedures for DN311 registration are described.
(2) Configuration and functions of the S controller interface buffer memory in the DN311
The operation of DN311 control and data input/output using the S controller is
basically performed by reading and writing the S controller interface buffer memory
with MREAD and MWRITE instructions. The configuration and functions of the S
controller interface buffer memory are described.
(3) Functions and usage of various request function blocks for operating the DN311
Use of a user function block which combines MREAD and MWRITE instructions
simplifies the program to contol DN311s and to input and output date using the S
controller. User function blocks are described.
(4) DN311's response code to various request commands (completion status)
The completion status of various control requests issued from the S controller to the
DN311 is described.
Based on the descriptions given in this chapter, Chapter 5 describes the procedures
for DN311 parameter setting, starting transmission, data input/output with slave
devices, and reading RAS information including event history. Sample programs are
also covered in Chapter 5.
Caution
• Prepare programs after fully understanding the descriptions given in this chapter. The sam-
ple programs are basic examples, which must be fully examined before application to actual
systems.
