Siemens SINEC L2 User Manual

S5-95U, SINEC L2 Start-Up, Tests, and Diagnostics
Operating the Programmable Controller with a SINEC L2 Interface
Figure 3-2 shows the operating principle of a programmable controller with the SINEC L2 interface.
Figure 3-2. Operating Principle of an S5-95U with the SINEC L2 Interface
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Operating
system
STEP 5 user
program
(OB, PB, FB, SB)
STEP 5 data
elements (DBs,
flags)
Handling of
telegram
traffic
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Control
processor
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Communications
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Programmable controller
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SINEC L2 interface
Communications Processor
The communications processor handles the frame traffic via the SINEC L2 network in parallel with
the control processor.
The communications processor has the following tasks:
• Receive frames that are used for network management, e.g., token frames, via SINEC L2
- Interpret the frame
- Trigger adequate reactions
• Receive frames that contain data via SINEC L2
- Interpret the frame
- Store the data in STEP 5 data elements
• Transmit frames that are used for network management, e.g., token frames, via SINEC L2
• Transmit frames that contain data via SINEC L2
- retrieve the data from STEP 5 data elements
- pack the data into frames and transmit
SINEC L2 Interface
9-pin subminiature D female connector as specified in the
PROFIBUS Standards .
Figure 3-3. Pin Assignment for the SINEC L2 Interface of the S5-95U
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Internally
assigned
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RXD/TXD (A) (data line A)
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M 5V2 (data reference potential)
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RTS (transmit request)
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RXD/TXD (B) (data line B)
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Not assigned
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PE (ground)
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Not assigned
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P 5V2 (supply
voltage+)
EWA 4NEB 812 6112-02 3-3

Siemens SINEC L2 Specifications

General

Brand	Siemens
Model	SINEC L2
Category	Controller
Language	English