User Manual

CM2U8567E / 04.1999 VISONIK DCS Functions and System Messages VVS18 Siemens Building Technologies
3-88 System Messages --- DCS Messages Landis & Staefa Division
receiver carrier disappeared
STAP TYP 00:00:00 NAME
receiver carrier disappeared
->MSGDEV (M.RDRC)
The receiver of the NAME ring suddenly no longer receives a carrier signal.
Possible causes are:
–
Sudden Ring break between the last process station and the DC Server.
–
Loose contact along the link (e.g., EKL base terminals).
–
Faulty Ring relay in the last process station (contact problem).
–
Faulty address key (hardware) in the last process station on the ring or contact
problem.
–
Loose address key (hardware) at the first process station on the ring, interrupting the
Ring's return line.
–
Reset of the last substation either through:
•
Hand reset
•
Power failure or low voltage, triggering the process station's watchdog.
–
Wrong function of the last process station e.g., because of defective RAM, a CPU halt
or a CPU boot.
–
Boot of the VISONIK DCS CPU, (particularly upon computer changeover).
–
Cross-talk or bad insulation between outgoing and return Ring lines somewhere
between the last Ring process station and the DC Server.
This situation is also noted at the process station and reported with the additional
information "!RxTraegr".
None. If, however, the message appears frequently, the faulty section must be localised
by checks e.g., with the Ring test plug and repaired.
The "last process station" physically on the ring need not necessarily be the same as
last process station with regard to signal flow (with regard to GPR report) because the
outgoing and return lines of the Ring are always wired together.
Explanation
Action
Note