PROFIBUS Communication modules
21
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
1.2.4 Block 4: OLM information
Block 4 with OLM information is only available for fibre-optical PROFIBUS modules.
OLMStA
OLMStB
Line status to the respective PROFIBUS-DP stations connected via optical channel A
(Ch1) and optical channel B (Ch2).
The interpretation of this status for communication modules from HW revision 4
depends on the selected operating mode of the Optical Link Module (ref. to chap.
2.1.2).
OLM V2 mode or OLM V3 mode without optical fibre link monitoring:
OLM V3 mode with optical fibre link monitoring
(Line/Star topology with optical fibre link monitoring or redundant optical ring):
Note:
All Optical Link Modules in the interconnected devices has to be configured identical
(ref. to chap 2.1.2, “Configuration of the fibre-optical interface”).
OK valid PROFIBUS messages are received via the optical channel
ERROR no valid PROFIBUS messages are received via the optical channel
(break in a fibre line or receive and transmit fibre line interchanged or no active
PROFIBUS station on the bus)
OK the fibre-optical line to the partner station is OK
ERROR a break in the fibre line to the partner station is detected (line break or receive
and transmit fibre line interchanged) or the baud rate was not recognized yet
because no active PROFIBUS station is connected to the bus
Note:
• The status of the optical channels is also indicated with the optional routable tag-
gings “Line-break Channel A” and “Line-break Channel B” and can be
evaluated in the SIPROTEC device (ref. to chap. 2.3.2).
• Additionally, the tagging “SysIntErr” should be used (ref. to chap. 2.3.1).
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