Communications Module Parameters/Networks - Siemens SIMATIC PCS 7 Operating Manual

Process control system compendium part b process safety v8.2
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Maximum disabling time for priority classes
Check the value for "Maximum disabling time for priority classes > 15".
Note
We recommend doing this again on the plant once commissioning is complete.
Follow the steps outlined below:
● Start up the standby CPU in an H-system.
Observe the FAQ "What do I have to keep in mind when downloading changes of an
H-system with safety program?"
(https://support.industry.siemens.com/cs/ww/en/view/89330232).
● In the diagnostic buffer of the master CPU, search for messages relating to the master
CPU's "Transition from coupling to updating", as well as for the message "Redundant
mode".
● The "Maximum disabling time for priority classes > 15" must be greater than the time
difference between the two messages. Make sure you factor reserve time of
approximately 20% into your setting.
Note
For more information and corrective measures, see manual "SIMATIC S7-400H Fault-
tolerant Systems" (https://support.industry.siemens.com/cs/ww/en/view/82478488).
6.3

Communications module parameters/Networks

The settings for communication modules are explained in Compendium Part A.
It may be advisable to operate the F-I/O on a separate DP master system when there are
numerous nodes or nodes with low transmission speeds.
PROFINET
PROFINET with PROFINET IO is increasingly used in automation engineering.
PROFINET IO is the open standard defined according to the PROFINET standard for
communication between controller and I/O devices based on Switched Ethernet.
The PROFIsafe specification has been expanded for fail-safe communication between
controller and PROFINET IOs, and is used in version PROFIsafe V2.x with PROFINET.
You can find additional information on PROFINET IO in the system description PROFINET
(https://support.industry.siemens.com/cs/ww/en/view/19292127).
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
Configuring S7F/FH hardware
6.3 Communications module parameters/Networks
39

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