Chapter 10 Programming; Precautions For Programming - Mitsubishi Electric MELSEC-Q Series User Manual

CHAPTER 10
This chapter describes precautions for programming, communication examples, and sample programs when data are
communicated at master/local modules.
The examples of communications shown in this chapter are the one between a master station and a remote device
station, or the one between a master station and a local station.
For the other communication examples, refer to the following.
• Communications between a master station and a remote I/O station:
• Communications between a master station and an intelligent device station:
Manual for the intelligent device station used
• Transient transmission example:
10.1

Precautions for Programming

This section describes precautions when creating a program for a master/local module.
(1) Interlock program
When creating a program to perform cyclic transmission, create the program that can detect data link status in a
slave station and interlock with the station. Use Other station data link status (SW0080 to SW0083) to detect data
link status in a slave station. (
Also create an error-handing program.
Interlock method
Ex.
Assume that the start I/O number of the master/local module is 0000 and a refresh device is set as
follows.
228
PROGRAMMING
Page 180, Section 9.2.1 to Page 213, Section 9.8.1
Page 351, Appendix 3.2)
Page 59, Section 4.1
Refresh device