BeiJer GN-9289 - Page 4

GN-9289 User Manual
Page 4 of (70)
G-series GN-9289 Modbus TCP_UDP Rev. 1.01.docx
7.2. Example of Input Process Image (Input Register) Map ............................................................................. 30
7.3. Example of Output Process Image (Output Register) Map ....................................................................... 31
8. MODBUS TCP/ UDP INTERFACE ................................................................................................................. 32
8.1. MODBUS TCP/ UDP Protocol ....................................................................................................................... 32
8.1.1 Comparison of MODBUS TCP/ UDP And MODUB/RTU .................................................................. 32
8.1.2 MODBUS TCP/ UDP MBAP Header .................................................................................................. 33
8.2. Supported MODBUS Function Codes ......................................................................................................... 34
8.2.1 1 (0x01) Read Coils ........................................................................................................................... 34
8.2.2 2 (0x02) Read Discrete Inputs .......................................................................................................... 35
8.2.3 3 (0x03) Read Holding Registers...................................................................................................... 36
8.2.4 4 (0x04) Read Input Registers .......................................................................................................... 37
8.2.5 5 (0x05) Write Single Coil ................................................................................................................. 37
8.2.6 6 (0x06) Write Single Register .......................................................................................................... 38
8.2.7 8 (0x08) Diagnostics .......................................................................................................................... 39
8.2.8 15 (0x0F) Write Multiple Coils .......................................................................................................... 41
8.2.9 16 (0x10) Write Multiple Registers ................................................................................................... 42
8.2.10 23 (0x17) Read/Write Multiple Registers ......................................................................................... 43
8.2.11 Error Response .................................................................................................................................. 44
8.3. MODBUS Special Register Map .................................................................................................................. 45
8.3.1. Adapter Identification Special Register (0x1000, 4096) .................................................................. 45
8.3.2. Adapter Watchdog Time, other Time Special Register (0x1020, 4128) .......................................... 46
8.3.3. Adapter TCP/IP Special Register (0x1040, 4160) ............................................................................. 46
8.3.4. Adapter Information Special Register (0x1100, 4352) ..................................................................... 47
8.3.5. Expansion Slot Information Special Register (0x2000, 8192) ....................................................... 48
8.4. Supported MODBUS Function Codes .......................................................................................................... 50
9. Object models ............................................................................................................................................... 51
9.1. Supported Objects ........................................................................................................................................ 51
9.2. Identity Object ............................................................................................................................................... 52
9.2.1. Common Services ............................................................................................................................. 52