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S7-300 CPU 31x -- Configuring and programming communication -- Configuring PROFINETinterfaces
In the user program, how do you read out the Link State of the PROFINET interface of a S7-300 CPU?
Which settings do you have to make in the TIA Portal to read out messages and status information over the CPU's web server and display them in the web browser?
How do you display the diagnostics buffer of a SIMATIC CPU with integrated web server on a SIMATIC Panel?
Which "local_device_id" do you parameterize in order to establish a connection to FB65 "TCON" for open communication via Industrial Ethernet?
How do you reset the IP address and device name of an I device?
Why is the message "This page is not available" displayed in the web browser when you call the HTML page "Topology", for example, to read out the topology via the web server of the CPU?
How do you activate the "Prioritized OCM communication" function to improve the OP communication performance?
What should you watch out for when parameterizing the watchdog time when a ring redundancy is established with the Media Redundancy Protocol?
Which CPU can you operate as a PROFINET I device?
What should you watch out for with a remote access to a SIMATIC S7 with STEP 7 via the Internet?
In the user program of an S7-300 or S7-400 CPU with integrated PN interface, how can you read out the current topology of the PROFINET IO system connected?
Where can you find sample S7 programs and documentation for communication via PROFINET on the SIMATIC NET Quick Start Collection?
What differences are there when configuring S7 connections?
Which settings are required to access the web server of the CPU via a PC with a second network card even though a proxy server is set?
Can you implement an S7 317-2 PN/DP CPU instead of an S7 315-2 PN/DP CPU configured in iMap?
How do you read data consistently from a DP standard slave/PROFINET IO device and write it consistently to a DP standard slave/PROFINET IO device?
What can you do when communication errors occur sporadically with a PROFINET interface of the S7 300 CPU 31x-2 PN/DP?
From which library should you take the communications FBs?
What are the commonalities and differences between configured communication connections and the open Ethernet communication?
What are the differences when assigning the MAC address?
S7-300 CPU 31x -- Configuring and programming communication -- Configuring the PROFIBUS interface
How do you activate the "Prioritized OCM communication" function to improve the OP communication performance?
How do you configure a connection between WinCC flexible Runtime (PC/Panel) and a SIMATIC S7-300/S7400 via PROFIBUS/MPI?
What differences are there when configuring S7 connections?
Transfer of analog values from and to the PROFIBUS DP slave
What should you pay attention to when operating a DP slave temporarily on a PROFIBUS DP network?
How do you configure an S7 connection via MPI with the SIMATIC NET OPC server and the SIMATIC NET PC software?
How do you configure a PC station as DP slave for connecting an S7 station (as DP master) for the SIMATIC NET OPC server with the SIMATIC NET PC software?
What are the differences between the integrated DP interface of a CPU (e.g. CPU 315-2 DP) and the DP interface of the CP 342-5?
How do you read data consistently from a DP standard slave/PROFINET IO device and write it consistently to a DP standard slave/PROFINET IO device?
What are the options for exchanging data between CPUs via MPI/PROFIBUS DP?
Direct data exchange (internode communication) between two CPU modules
S7 routing via PROFIBUS with S7-300
Rules for accessing the CPU 315-2 DP on distributed I/O (integrated DP interface of CPU 315-2 DP)
Startup of the S7-300 CPUs when slave is not available
Routing with compact CPU and C7-635 as DP slave
How can you tell whether your S7-300/400 master supports DPV1 functions?
S7-300 CPU 31x -- Configuring and programming communication -- Configuring MPI interfaces
How do you activate the "Prioritized OCM communication" function to improve the OP communication performance?
Which protocols and services can you use for communication via MPI?
How do you configure an S7 connection via MPI with the SIMATIC NET OPC server and the SIMATIC NET PC software?
Basic communication between CPUs with global data
Options for communications via MPI
How do you activate the "Prioritized OCM communication" function to improve the OP communication performance?
Part number:

Description
With OP communication you exchange data between operator stations, for example Operator Panel (OP), Touch Panel (TP) or WinCC, and SIMATIC modules with communications capability. The service is possible by way of MPI, PROFIBUS and Industrial Ethernet subnetworks.

With OP communication we provide you with functions that you need for operator control and monitoring. These functions are integrated in the operating system of the SIMATIC S7 modules. A CPU maintain multiple connections to one or various different operator stations.

When you activate the "Prioritized OCM communication" function you can significantly accelerate the OP communication.

The CPUs below support the "Prioritized OCM communication" function.
 
CPU Order number Firmware
CPU315-2 PN/DP 6ES7315-2EH14-0AB0 from V3.2
CPU315F-2 PN/DP 6ES7315-2FJ14-0AB0 from V3.2
CPU317-2 PN/DP 6ES7317-2EK14-0AB0 from V3.2
CPU317F-2 PN/DP 6ES7317-2FK14-0AB0 from V3.2
CPU319-3 PN/DP 6ES7318-3EL01-0AB0 from V3.2
CPU319F-3 PN/DP 6ES7318-3FL01-0AB0 from V3.2

You activate the "Prioritized OCM communication" function for the CPUs above in the Hardware Configuration.
In the Hardware Configuration you double-click the configured CPU to open the Properties dialog. Go to the "Cycle/Clock Memory" tab and activate the "Prioritized OCM communication" function.


Fig. 01

Note

  • The consistency of the data to the user program is no longer guaranteed. The consistency must be provided by the user program.
  • The cycle time increases.

Data consistency with the PUT/GET functions

  • When you activate the "Prioritized OCM communication" function, the specified data consistency is no longer guaranteed, because the communication tags in blocks of up to 240 bytes are not copied consistently to and from the user memory in the cycle control point of the operating system. The communication tags are copied to and from the user memory during the runtime of the user program. The consistency must be provided by the user program.
    The following continue to be consistent:
    • Byte / Word / Double-word access
    • SFC14 "DPRD_DAT"
    • SFC15 "DPWR_DAT"
    • SFC81 "UBLKMOV"
  • If a defined data consistency is required, then the communication tags in the user program of the CPUs must not be greater than 240 bytes.

Further Information
The manual "SIMATIC S7-300 CPU 31xC and CPU 31x: Technical Data", sections 3.2.3 and 3.2.11 provide information about the "Prioritized OCM communication" function. The manual is available for downloading in Entry ID: 12996906.

 Entry ID:49749632   Date:2011-04-27 
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