Pilz PSSnet GW1 MOD-EtherCAT - Manual (Page 17)

Function description
Operating Manual PSSnet GW1 MOD-EtherCAT
1002692-EN-02
17
Modbus/TCP
The Gateway can manage a max. of 8 Modbus/TCP connections. The Gateway is always
the connection Server. The connection Clients may be various devices, e.g. PC, control
system, display unit. They can access the Gateway simultaneously.
Port number "502" in the Gateway is set as the default for data exchange via a Modbus/
TCP connection.
Modbus/TCP data ranges (Server connections)
The product supports the following Modbus/TCP data areas:
Data area Modbus syntax Example
Coils (Bit)
0x00000 … 0x65535
[read/write]
0x[xxxxx] 0x00031
Discrete Inputs (Bit)
1x00000 … 1x65535
[read only]
1x[xxxxx] 1x08193
Input Register (Wort/16 Bits)
3x00000 … 3x65535
[read only]
3x[xxxxx] 3x00002
Holding Register (Wort/16
Bits)
4x00000 … 4x65535
[read/write]
4x[xxxxx] 4x00805
Modbus/TCP data areas
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)
4.2
4.2.1
4.2.2