Function description
Operating Manual PSSnet GW1 MOD-CAN
1002693-EN-02
18
Information
Addressing for Pilz systems starts at "0". On devices from other manufactur-
ers, addressing may start at "1".
Please refer to the operating manual provided by the relevant manufacturer.
Data transfer limits
This table contains the maximum data lengths supported per telegram:
Data transfer Max. data length per tele-
gram
Read data (Bit) FC 01 (Read Coils) 1 … 2000
FC 02 (Read Discrete In-
puts)
Read data (Word) FC 03 (Read Holding Regis-
ters)
1 … 125
FC 04 (Read Input Register)
Write data (Bit) FC 05 (Write Single Coil) 1 Bit
FC 15 (Write Multiple Coils) 1 … 1968
Write data (Word) FC 06 (Write Single Regis-
ter)
1 Word
FC 16 (Write Multiple Regis-
ters)
1 … 123 Words
Read and write data (Word) FC 23 (Read/Write Multiple
Registers)
Read 1 … 125 Words
Write 1 … 121 Words
Data transfer limits
Information
There may be some restrictions in data length, depending on the device that
is used. Please refer to the information stated in the operating manual of the
relevant unit.
Function codes (Client connections)
The connection Client can access the Gateway's data areas using the following function
codes (FC):
Data area Modbus syntax Example
FC 01 Read Coils The connection Client reads
bit data from the connection
Server,
data length = 1 Bit, content,
content: input/output data
(data received from 0x)
4.2.2
4.2.3
