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FnIO MODBUS Adapter NA-9189
FnIO S-Series
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5.2.3.
I/O Process Image Map
An expansion module may have 3 types of data as I/O data, configuration parameter and memory register.
The data exchange between network adapter and expansion modules is done via an I/O process image data by
FnBus protocol. The following figure shows the data flow of process image between network adapter and
expansion modules.
5.2.4.
MODBUS Interface Register / Bit Map
Register Map
Start Address Read/Write Description
Func. Code
0x0000 ~
Read
Process input image registers (Real Input Register)
4, 23
0x0800 ~
Read/Write
Process output image registers (Real Output Register)
3, 16, 23
0x1000 ~
Read
Adapter Identification special registers.
3, 4, 23
0x1020 ~
Read/Write
Adapter Watchdog, other time special register.
3, 4, 6, 16, 23
0x1100 ~
Read/Write
Adapter Information special registers.
3, 4, 6, 16, 23
0x2000 ~
Read/Write
Expansion Slot Information special registers.
3, 4, 6, 16, 23
* The special register map must be accessed by read/write of every each address (one address).
Bit Map
Start Address Read/Write Description
Func. Code
0x0000 ~
Read
Process input image bits
All input registers area is addressable by bit address.
Size of input image bit is size of input image register * 16.
2
0x0800 ~
Read/Write
Process output image bits
All output registers area is addressable by bit address.
Size of output image bit is size of output image register * 16.
1, 5, 15
