Service
SICAM RTUs, SICAM AK 3 User Manual 211
DC2-028-2.03, Edition 07.2016
OH X3 yellow
PRE3 request to
send
˜
Protocol element 3, Send request to transmis-
sion facility
RTX X3 yellow
PRE3 TXD/RXD
˜
Protocol element 3, activity on trans-
mit/receive direction
ACT3 yellow
PRE3 Active
˜
Protocol element 3, interface active - redun-
dancy
ER3 yellow
PRE3 Error
˜
§
Protocol element 3, Error on interface
Communication failure (all connections faulty)
Communication fault (at least one connection
faulty)
Display elements of the protocol elements equipped with submodule SM-2547 or
SM-2557
Name Color Function LED Meaning
OH X2 yellow
PRE2/Port-0 Link
˜
Protocol element 2, physical connection to
switch/remote station
RTX X2 yellow
PRE2/Port-0 Pack-
et
˜
Protocol element 2, activity on trans-
mit/receive direction
ACT2 yellow
PRE2/Port-0 Active
˜
Protocol element 2, interface active - redun-
dancy
ER2 yellow
PRE2/Port-0 Error
˜
Protocol element 2, Error on interface
OH X3 yellow
PRE3/Port-1 Link
˜
Protocol element 3, physical connection to
switch/remote station
RTX X3 yellow
PRE3/Port-1 Pack-
et
˜
Protocol element 3, activity on trans-
mit/receive direction
ACT3 yellow
PRE3/Port-1 Active
˜
Protocol element 3, interface active - redun-
dancy
ER3 yellow
PRE3/Port-1 Error
˜
Protocol element 3, Error on interface
Operating Elements
Name Color Function Meaning
RES - Reset Reset of the subordinate system elements
The reset signal of the master control element affects the entire automation unit, this means
also the
• Processing and communication elements
• Protocol elements
• Peripheral elements
The reset signal of a processing and communication element affects only its belonging subor-
dinate protocol elements and peripheral elements
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