Appendix; Additional Hardware And Software For Prb Applications; Prb Segment Controller - Siemens 6ES7 972-4AA02-0XA0 User Manual

User´s Guide Power Rail Booster

9 Appendix

9.1 Additional Hardware and Software for PRB Applications

9.1.1

PRB Segment Controller

Function
Depending on the length and baud rate of a contact rail system, you will generally
need several stationary Power Rail Boosters to supply it with PROFIBUS signals.
The sub-area of a contact rail system, which transfers data via a stationary PRB, is
referred to as a PRB segment.
Two adjoining PRB segments "Segment A" and "Segment B" must be separated by
an isolating rail section "Segment A-B" or a double rail section such that a segment
short-circuit does not occur due to the current collector's sliders while transitioning
this PRB segment limit. During the transition across a PRB segment limit of this type,
there is a break in communications due to operating conditions.
The PRB Segment Controller prevents this break in communications by switching the
PROFIBUS supply of interim segment A-B from Segment A to Segment B during the
transition. This segment switching process is carried out automatically and has no
effect on PROFIBUS message frame traffic.
The input signal of an external sensor triggers switchover of PRB segments A and B.
The Segment Controller chooses a break between two message frames as the
switchover instant. This means that switchover is carried out without disturbing
PROFIBUS communication
Advantages for users
• No operational interruptions to message frames
=> therefore no effects to the system as a whole
• All vehicles can be reached even on interim segments
• No control software necessary in the stationary plant control
• Easy configuration (you can position PRB segment limits anywhere you like)
• Easy configuration (you can position PRB segment limits anywhere you like)
• Support for controller in the case of a DP Master segment change
• Support at commissioning and preventive maintenance by means of LEDs
• Safe operation even in the case of errors by activating interim segment A-B
You can also integrate the PRB Segment Controller in existing Power Rail networks
on a retrospective basis.
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6ES7 972-4AA02-0XA0
Version 12/2005
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