User Manual

CM2U8567E / 04.1999 VISONIK DCS Functions and System Messages VVS18 Siemens Building Technologies
3-84 System Messages --- DCS Messages Landis & Staefa Division
PS# xxx DMAL=yyy RL=zzz Frame: www ......
STAP TYP 00:00:00 NAME
PS# xxx DMAL=yyy RL=zzz Frame: www ..
->MSGDEV (M.RUDL)
RC=vvv
The system identifies the length of received telegrams using three sources:
1) The number of bytes that were transferred by DMA (yyy).
2) The number of bytes that were received by the SDLC chip (zzz).
3) Through the first byte transmitted www. (Only meaningful if yyy and zzz are greater
than zero.)
This message appears if the system receives a telegram where the check sum is
correct, but the lengths from the three sources are unequal.
If such messages (with yyy=zzz) always originate from the same process station, then
the cause should be searched for there (very probably a fault on the RAM card).
On the other hand, if yyy and zzz are unequal, then the cause surely lies with the
VISONIK DC Server.
Depending on which of the three numbers agree with each other, search for the source
of the fault at the DMA logic, the SDLC chip or the VISONIK DCS software.
If defective telegrams with correct check sums are actually received, then this additional
long test ensures that the telegram is rejected.
For repeated occurrences, depending on the condition described, either replace the
EKL/PRV/BPS controller of the process station or the SDLC controller in the DC Server.
If the new controller does not function as desired, then please contact service at Landis
& Staefa FS&PM.
Explanation
Action