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WF-2000 Series AIO User’s Manual (Ver. 1.2, May./2014) ------------- 42
c. The following Modbus command function codes are available
for WF-2000 series control.
Table
4-1 Modbus request command list
Request
FC1 Read
multiple coils
status (0xxxx) for
DO
FC2 Read
multiple input
discrete (1xxxx)
for DI
FC3 Read
multiple
registers
(4xxxx) for AO
FC4 Read
multiple input
registers
(3xxxx) for AI
FC15 Force
multiple coils
(0xxxx) for DO
FC16 Write
multiple
registers
(4xxxx) for AO
Byte 0 Net ID
Byte 1 FC=0x01 FC=0x02 FC=0x03 FC=0x04 FC=0x0F FC=0x10
Byte 2-3 Reference number
Byte 4-5 Bit count Bit count Word count Word count Bit count Word count
Byte 6 N/A N/A N/A N/A Byte count (B) Byte count (B)
Byte 7-( B+6) N/A N/A N/A N/A
Data to be
written
Register values
d. Modbus TCP request command examples.
Figure 4-13 Read multiple coils status (0xxxx) for DO
Figure 4-14 Force multiple coils (0xxxx) for DO
Figure 4-15 Read multiple input discretes (1xxxx) for DI
Figure 4-16 Read multiple input registers (3xxxx) for AI