Appendix B Device Address
B-3
B.2 Function Codes and Number of Devices Supported
for Modbus Protocols
F
code
Name Description Number of devices supported
01 Read Coil Status X, Y, M, SM, S, T, C, HC 1~1600 bits
02 Read Discrete Input Status X, Y, M, SM, S, T, C, HC 1~1600 bits
03 Read Holding Registers X, Y, SR, D, T, C, HC, E 1~100 words, (1~50 for HC)
04 Read Input Registers X 1~100 words
05 Force Single Coil Y, M, SM, S, T, C, HC 1 bit
06 Preset Single Register Y, SR, D, T, C, HC, E 1 word
0F Force Multiple Coils Y, M, SM, S, T, C, HC 1~1600 bits
10 Preset Multiple Register Y, SR, D, T, C, HC, E 1~100 words, (1~50 for HC)
17 Read/Write Multiple Register Y, SR, D, T, C, HC, E 1~100 words, (1~50 for HC)
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