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Table of Contents

Preface ................................................................................................................................. ⅲ

User Manual Guide ................................................................................................................ ⅳ

Communication Protocol ........................................................................................................ ⅴ

User Manual Symbols ............................................................................................................ ⅵ

Safety Precautions ................................................................................................................. ⅶ

Table of Contents.................................................................................................................... ⅸ

1 Modbus RTU Protocol .............................................................................. 11

1.1 Read coil status(Func 01–01H) ..................................................................................... 11

1.2 Read input status(Func 02–02H) .................................................................................. 12

1.3 Read holding registers(Func 03–03H) .......................................................................... 13

1.4 Read input registers(Func 04–04H) .............................................................................. 14

1.5 Force single coil(Func 05–05H) .................................................................................... 15

1.6 Preset single registers(Func 06–06H) ........................................................................... 16

1.7 Preset multiple registers(Func 16–10H) ........................................................................ 17

1.8 Exception response-error code ..................................................................................... 18

2 Modbus Mapping Table ............................................................................ 19

2.1 Reset/Output ................................................................................................................. 19

2.2 Terminal input status...................................................................................................... 19

2.3 Product Information ....................................................................................................... 20

2.4 Monitoring data .............................................................................................................. 21

2.5 Preset value setting group ............................................................................................. 22

2.6 Function setting mode ................................................................................................... 23

2.6.1 Counter group ........................................................................................... 23

2.6.2 Timer group ............................................................................................... 24

2.6.3 Communication group .............................................................................. 25

Autonics CT Series User Manual

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