Pilz PNOZ m B0 - Manual (Page 49)

Modbus/TCP
Operating Manual PNOZmulti 2 Communication Interfaces
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Error codes on Modbus/TCP
Code Name Description
01 Invalid function The function code in the enquiry is not
supported.
02 Invalid data address The data address received in the enquiry
is outside the memory range.
03 Invalid data Invalid data requested.
6.4.3 Data transfer limits
The following table contains information on the data length per telegram that is supported:
Data transfer Data length per telegram
Read data
(Bit) FC 01 (Read Coils) 1 … 2000
FC 02 (Read Discrete Inputs)
Read data
(Bit) FC 05 (Write Single Coil) 1 Bit
FC 15 (Write Multiple Coils) 1 … 1968
Read data
(Word) FC 03 (Read Holding Re­
gisters) 1 … 125
FC 04 (Read Input Register)
Write data
(Word) FC 06 (Write Single Register) 1 Word
FC 16 (Write Multiple Re­
gisters) 1 … 123 Words
Read and
write data
(Word) FC 23 (Read/Write Multiple
Registers) Read 1 … 125 Words
Write 1 … 121 Words
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
device you are using.
6.4.4 Input and output data, watchdog
The table below describes the Modbus/TCP data areas that contain the current state of the
virtual inputs of the PNOZmulti 2. These are the virtual inputs that can be set by the user.
Relevant areas for the data are defined in each Modbus/TCP data area (Coils (0x), Discrete
Inputs (1x), Input Register (3x), Holding Register (4x)). Read/write access will depend on
the Modbus/TCP data area.