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PROFIBUS / PROFIsafe - Commissioning
6.3 Measuring system <--> PROFIBUS / PROFIsafe communication
The actual values for position and speed are transmitted in two slots:
●
The position actual values of both measuring systems are compared for safe
transmission. If the difference is less than the set monitoring window, the value is
considered safe. The safe position actual value and the calculated safe speed
value are transmitted via the PROFIsafe profile. The part of the control which
performs the safety-oriented functions can then process these values.
●
The position actual value and the calculated speed value of the first measuring
system are directly transmitted in the unsafe process data channel. This channel
is generally processed more frequently by the control. This allows normal
automation processes to access the updated position value more frequently.
Profibus Protocol
Process Data Channel
Saving Channel (F-Channel)
Data of system 1:
Position
Speed
Data of System 1, verified
with System 2
Position
Speed
0,5ms
5ms
Normal part of the control
Secured part of the control
Normal Automation
Functions, e.g. Position
Control...
Short Cycle Time
Safety Relevant
Functions
Secured Data Traffic
Control
Figure 15: Measuring system - PROFIsafe communication
Printed in the Federal Republic of Germany
07/14/2011
TR-Electronic GmbH 2010, All Rights Reserved
TR - ECE - BA - DGB - 0079 - 04
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