1.1.2 Device function list......................................................................................................................... 15

1.2 Program Memory and Devices................................................................................................... 17

1.2.1 Memory structure........................................................................................................................... 17

1.2.2 Memory operations and backup against power interruption (power ON/OFF and RUN/STOP) ... 22

1.2.3 Types of backup methods against power interruption ................................................................... 32

1.2.4 Change of devices between general type and latched (backed-up) type...................................... 33

1.2.5 How to initialize latched (backed-up) type devices........................................................................ 33

2. Devices in Detail

2.1 Device Number List..................................................................................................................... 35

2.2 Input/Output Relays [X and Y] ................................................................................................... 37

2.2.1 Numbers of input/output relays...................................................................................................... 37

2.2.2 Functions and roles ....................................................................................................................... 39

2.2.3 Operation timing of I/O relays........................................................................................................ 40

2.3 Auxiliary relay [M] ....................................................................................................................... 41

2.3.1 Numbers of auxiliary relays ........................................................................................................... 41

2.3.2 Functions and operation examples................................................................................................ 42

2.4 State Relay [S] ............................................................................................................................. 44

2.4.1 Numbers of state relays................................................................................................................. 44

2.4.2 Functions and operation examples................................................................................................ 46

2.5 Timer [T]....................................................................................................................................... 48

2.5.1 Numbers of timers ......................................................................................................................... 48

2.5.2 Functions and operation examples................................................................................................ 50

2.5.3 Set value specification method...................................................................................................... 52

2.5.4 Cautions on use............................................................................................................................. 52

2.5.5 Details of timer operations and timer accuracy ............................................................................. 52

2.5.6 Program examples [Off-delay timer and flicker timer] ................................................................... 53

2.5.7 Handling timers as numeric devices.............................................................................................. 54

2.6 Counter [C] .................................................................................................................................. 55

2.6.1 Numbers of counters ..................................................................................................................... 55

2.6.2 Features of counters...................................................................................................................... 56

2.6.3 Related devices (to specify counting direction) [32-bit counter] .................................................... 56

2.6.4 Functions and operation examples................................................................................................ 57

2.6.5 Set value specification method...................................................................................................... 58

2.6.6 Cautions on use............................................................................................................................. 59

2.6.7 Response speed of counters......................................................................................................... 59

2.6.8 Counters handled as numeric devices .......................................................................................... 59

2.7 High Speed Counter [C].............................................................................................................. 62

2.7.1 Types and device numbers of high speed counters ...................................................................... 62

2.7.2 Input assignment for high speed counters..................................................................................... 69

2.7.3 Handling of high speed counters ................................................................................................... 74

2.7.4 Current value update timing and comparison of current value ...................................................... 77

2.7.5 Related devices ............................................................................................................................. 78

2.7.6 Change of logic of external reset input signal................................................................................ 79

2.7.7 Assignment of counter input terminal and switching of function.................................................... 80

2.7.8 How to use 2-phase 2-counting input counters C251 to C255 for 4-edge counting ...................... 82

2.7.9 Condition under which hardware counters are handled as software counters .............................. 83

2.7.10 Response frequency of high speed counters .............................................................................. 84

2.7.11 Cautions on use........................................................................................................................... 92

Table of Contents