Beijer Electronics NA-9379 - Manual (Page 58)

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MODBUS Programmable I/O NA-9379 FnIO S-Series
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APPENDIX A - MODBUS INTERFACE
A.1 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