PROFINET IO controller communication protocol

Parameter

Description

Maximum number of PROFINET IO devices/AR (Application Relation)

  • 128 (RT)
  • 64 (IRT)

Maximum number of PROFINET IO devices/AR depending on send cycle

  • 16 AR maximum at send cycle of 1 ms
  • 64 AR maximum at send cycle of 2 ms

Send cycle

  • RT mode: 1 ms, 2 ms, 4 ms
  • IRT mode: 1 ms, 2 ms, 4 ms

Maximum number of cyclic input data

5652 bytes (including IOxS status bytes)

Maximum number of cyclic output data

5760 bytes (including IOxS status bytes)

Maximum number of cyclic input data per IO device

1440 bytes (including IOxS status bytes)

Maximum number of cyclic output data per IO device

1440 bytes (including IOxS status bytes)

Maximum number of submodules

2048

Maximum speed for acyclic reading/writing (record access)

65 535

Alarm handling

Supported by means of the IEC user program

Diagnostics data

200-byte buffer per IO device

DCP functions via API

(DCP = Discovery and Configuration Protocol)

(API = Application Programming Interface)

  • DCP SET NameofStation (IO device name assignment)
  • DCP SET IP (set the IP parameters of the IO device)
  • DCP SET SIGNAL (IO device signal)
  • DCP Reset FactorySettings (reset IO device to factory settings)
  • DCP IDENTIFY (bus scan)
  • DCP GET (retrieve the data set of the IO device)

Supported protocols

  • RTC - Real Time Cyclic Protocol, Class 1
  • RTA - Real Time Acyclic Protocol
  • DCP - Discovery and configuration Protocol
  • CL-RPC - Connectionless Remote Procedure Call

Functions

  • Fast startup of PROFINET IO devices is supported.
  • MRP client (media redundancy station)

PROFINET specification

  • Implemented acc. to V2.3 ED2 MU3
  • Legacy startup acc. to PROFINET specification V2.2 supported

Baud rate

100 Mbit/s full duplex

Data transport layer

Ethernet II, IEEE 802.3

Configuration file

Maximum 1 megabyte

Limitations

The following functions are not supported:

  • "RT over UDP"
  • "Multicast communication"
  • DHCP server
  • DHCP client
  • Shared device
  • MRP manager
  • MRPD (Media Redundancy for Planned Duplication)
  • IRT planning through the PROFINET IO controller
  • Sync slave
  • Multiple MRP managers
  • Multiple sync masters

The following functions are subject to restrictions:

  • Only one fragmented acyclic service at a time
  • Only one DCP service at a time