xv
PRECAUTIONS
This section provides general precautions for using the CQM1H-series Programmable Controllers (PCs) and related
devices.
The information contained in this section is important for the safe and reliable application of Programmable
Controllers. You must read this section and understand the information contained before attempting to set up or
operate a PC system.
1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvi
4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii
5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii
6 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii
6-1 Applicable Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii
6-2 Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii
6-3 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii
6-4 Relay Output Noise Reduction Methods . . . . . . . . . . . . . . . . . . . . . xxii
7 Upgrades Made to New Version of CQM1H CPU Units . . . . . . . . . . . . . . . . xxiv
7-1 Reading Manufacturing Numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . xxiv
7-2 Changes in Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiv
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