Function description
Operating Manual PSSnet GW1 MOD-CAN
1002693-EN-02
19
Data area Modbus syntax Example
FC 02 Read Discrete Input The connection Client reads
bit data from the connection
Server,
data length = 1 Bit, content,
content: input/output data
(data received from 1x)
FC 03 Read Holding Register The connection Client reads
word data from the connec-
tion Server,
data length = 1 Word,
content: diagnostic word
(data received from 4x)
FC 04 Read Input Register The connection Client reads
word data from the connec-
tion Server,
data length = 1 Word,
content: diagnostic word
(data received from 3x)
FC 05 Write Single Coil The connection Client writes
to one bit datum in the con-
nection Server,
data length = 1 Bit,
content: input data (send
data to 0x)
FC 06 Write Single Register The connection Client writes
to one word datum in the
connection Server,
data length = 1 Word,
content: input data (send
data to 4x)
FC 15 Write Multiple Coils The connection Client writes
to multiple bit data in the
connection Server,
data length = 1 Bit,
content: input data (send
data to 0x)
FC 16 Write Multiple Registers The connection Client writes
to multiple word data in the
connection Server,
data length = 1 Word,
content: input data (send
data to 4x)
FC 23 Read/Write Multiple Regis-
ters
The connection Client reads
and writes multiple word data
within a telegram
(receive data from 3x and
send data to 4x)
