Beijer Electronics NA-9379 - Manual (Page 5)

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MODBUS Programmable I/O NA-9379 FnIO S-Series
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6.4. Network Variable .................................................................................................................................... 50
6.5. Download and Monitoring ................................................................................................................. 53
7. Upgrade Firmware ................................................................................................................................................... 54
7.1. Using IAP over Ethernet....................................................................................................................... 54
8. Trouble Shooting ...................................................................................................................................................... 56
8.1. How to diagnose by LED indicator ................................................................................................. 56
8.2. How to diagnose when device couldn’t communicate network ....................................... 57
APPENDIX A - MODBUS INTERFACE ........................................................................................................................ 58
A.1 MODBUS Interface Register / Bit Map .......................................................................................... 58
A.2 MODBUS Transmission Mode ........................................................................................................... 59
A.2.1. RTU Transmission Mode ..................................................................................................................... 59
A.2.2. ASCII Transmission Mode ................................................................................................................... 59
A.3 Supported MODBUS Function Codes ............................................................................................ 59
A.3.1. 1 (0x01) Read Coils ................................................................................................................................ 60
A.3.2. 2 (0x02) Read Discrete Inputs .......................................................................................................... 61
A.3.3. 3 (0x03) Read Holding Registers ..................................................................................................... 62
A.3.4. 4 (0x04) Read Input Registers .......................................................................................................... 63
A.3.5. 5 (0x05) Write Single Coil ................................................................................................................... 64
A.3.6. 6 (0x06) Write Single Register .......................................................................................................... 65
A.3.7. 8 (0x08) Diagnostics .............................................................................................................................. 66
A.3.8. 15 (0x0F) Write Multiple Coils .......................................................................................................... 69
A.3.9. 16 (0x10) Write Multiple Registers ................................................................................................. 70
A.3.10. 23 (0x17) Read/Write Multiple Registers .................................................................................... 71