5-1
Chapter 5 CPU and Module Devices
Table of Contents
5.1 Introduction on CPU Devices........................................................................... 5-2
5.1.1 Device Table ............................................................................................ 5-2
5.1.2 Basic Structure of I/O Storage .................................................................... 5-3
5.1.3 Relation Between the PLC Action and the Device Type .................................... 5-4
5.1.4 Latched Areas in the Device Range .............................................................. 5-5
5.2. CPU Device Functions .................................................................................... 5-6
5.2.1 Values and Constants ................................................................................ 5-6
5.2.2 Floating-point Numbers ............................................................................. 5-8
5.2.3 Strings .................................................................................................. 5-10
5.2.4 Input Relays (X) ..................................................................................... 5-11
5.2.5 Output Relays (Y) ................................................................................... 5-12
5.2.6 Auxiliary Relays (M) ................................................................................ 5-12
5.2.7 Special Auxiliary Relays (SM) .................................................................... 5-12
5.2.8 Flags (S) ............................................................................................... 5-13
5.2.9 Timers (T) ............................................................................................. 5-13
5.2.10 Counters ............................................................................................... 5-15
5.2.11 32-bit Counters (HC) ............................................................................... 5-17
5.2.12 Data Registers (D) .................................................................................. 5-19
5.2.13 Special Data Registers (SR) ...................................................................... 5-19
5.2.14 Index Register (E) ................................................................................... 5-19
5.2.15 File Registers (FR) ................................................................................... 5-20