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FnIO MODBUS Adapter NA-9171, NA-9173
FnIO S-Series
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4.2.
Plugging and Removal of the Components. .............................................................................. 15
4.3.
Internal FnBus/Field Power Contacts ............................................................................................. 16
5. MODBUS Electrical Interface ............................................................................................................................... 17
5.1.
FnBus System ............................................................................................................................................ 17
FnBus Pin Description ............................................................................................................................................ 18
5.2.
MODBUS Electrical Interface .............................................................................................................. 19
5.2.1. NA-9171 (RS-232) ................................................................................................................................... 19
5.2.2. NA-9173 (RS-485) ................................................................................................................................... 19
5.2.3. Terminator Resistor ................................................................................................................................ 20
5.2.4. MODBUS DIP Switch Setup ................................................................................................................ 21
5.2.5. MODBUS Address Setup ..................................................................................................................... 22
5.2.6. I/O Process Image Map ....................................................................................................................... 23
5.2.7. MODBUS Interface Register / Bit Map .......................................................................................... 23
5.3.
Example ....................................................................................................................................................... 24
5.3.1. Example of Input Process Image(Input Register) Map .......................................................... 24
5.3.2. Example of Output Process Image(Output Register) Map .................................................. 27
6. MODBUS INTERFACE .............................................................................................................................................. 29
6.1.
MODBUS Transmission Mode ........................................................................................................... 29
6.1.1. RTU Transmission Mode ...................................................................................................................... 29
6.1.2. ASCII Transmission Mode ................................................................................................................... 29
6.2.
Supported MODBUS Function Codes ............................................................................................ 29
6.2.1. 1 (0x01) Read Coils ................................................................................................................................ 30
6.2.2. 2 (0x02) Read Discrete Inputs ........................................................................................................... 31
