User manual

SR2MAN01 11/2007 87
16
LD Language Elements
At a Glance
Subject of this
Chapter
This chapter describes the different automation functions of the LD language.
What's in this
Chapter?
This chapter contains the following topics:
Topic Page
Introduction 88
Discrete Inputs 89
Zx Keys 91
Auxiliary Relays 93
Discrete (DISCR) Outputs 98
Timers 101
Counters 111
Fast Counter 118
Counter Comparators 128
Analog Comparators 129
Clocks 134
Texts 138
LCD Screen Backlighting 140
Change to Summer / Winter Time 141
Modbus Inputs/Outputs 143
Message 144