INZ-TN513974-E i
CONTENTS
1. COMMUNICATION FUNCTIONS ............................................................................................1
1.1 General................................................................................................................................................1
2. SPECIFICATIONS .......................................................................................................................2
2.1 Communication specifications............................................................................................................2
3. CONNECTION.............................................................................................................................3
3.1 Terminal allocation (Input/output terminal CN2) ...............................................................................3
3.2 Connection ..........................................................................................................................................3
4. SETTING OF COMMUNICATION CONDITION .....................................................................4
4.1 Set items..............................................................................................................................................4
4.2 Setting operation .................................................................................................................................4
5. MODBUS COMMUNICATION PROTOCOL............................................................................5
5.1 General................................................................................................................................................5
5.2 Composition of message .....................................................................................................................6
5.3 Response of slave station ....................................................................................................................8
5.4 Function code......................................................................................................................................9
5.5 Calculation of error check code (CRC-16) .......................................................................................10
5.6 Transmission control procedure........................................................................................................12
6. DETAILS OF MESSAGE ..........................................................................................................14
6.1 Read-out of word data [Function code:03H] ..................................................................................14
6.2 Read-out of read only word data [Function code:04H] .....................................................................16
6.3 Write-in of word data (1 word) [Function code:06H]........................................................................18
6.4 Write-in of continuous word data [Function code:10H] .................................................................19
7. ADDRESS MAP AND DATA FORMAT .................................................................................21
7.1 Data format .......................................................................................................................................21
7.2 Address map .....................................................................................................................................23
7.3 Supplement to address map ..............................................................................................................27
8. SAMPLE PROGRAM ................................................................................................................28
9. TROUBLESHOOTING..............................................................................................................34
