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88TK50/R1210
Exchange of 88TK50 modules in case of
dual---channel station---bus coupling
In the case of a dual---channel station ---bus coupling, bump-
less exchange of modules is possible on ---line and without any
impairment of the ongoing station operation provided that the
module is in the PASSIVE state.
The PASSIVE state is indicated by the following LED annuncia-
tion on the module front:
LED designation
Operating state
FE
FDDI receiving
FS
FDDI sending
Procedure for module exchange:
1. The module to be replaced must be withdrawn while being
in the PASSIVE state, with the optical cables connected.
2. Then, the optical cables have to be removed.
3. Plug the optical cables onto the new module.
4. Now, the new module may be plugged into its module slot,
the optical cables being connected.
WARNING!
It is not admissible to withdraw a 88TK50 module without the
optical cables being connected.
A second 88TK50 module may be installed into a station only
after the 88TK50 module, which already exists in that station,
has reached its ACTIVE state.
The ACTIVE state is indicated by the following LED signals on
the module front:
LED designation
Operating state
FE
FDDI receiving
FS
FDDI sending
Improper handling may cause failure of the station operation.
6
Diagnosis and annunciation functions
Disturbance annunciation signals to the annunciation
system
The annunciation system and/or the control diagnosis system
(CDS) receives the disturbance annunciation signals of the
module via the PROCONTROL remote bus (FDDI interface).
They also include message 'General disturbance of station
detected' generated from the individual signals of the station
modules.
The 88TK50 transmits its disturbance annunciation signals and
diagnosis results in 2 diagnosis registers using register
LED signal
address 246.
OFF
The contents of both diagnosis registers are transmitted at the
beginning of each cyclic call, and thus are stored in the cyclic
OFF or
send shared memory for being sent via the FDDI system inter-
FLASHING
face.
Sequence:
--- Diagnosis register for module address 60 in the case of
single ---channel station ---bus coupling or
Diagnosis register for module address 60 or 61 in the case
of dual---channel station ---bus coupling,
--- Diagnosis register for module address 62
In the event mode, event messages of the 88TK50 are trans-
mitted over the station bus and thus are stored in the event---
send FIFO for being sent via the FDDI system interface.
The following types of disturbance are detected:
1. Internal module disturbances
2. Disturbances in data communication over the station bus
and the PROCONTROL remote bus (FDDI interface)
3. Disturbance signals of other station modules (in the form of
'General disturbance of station detected')
4. Disturbance signals from the monitoring interface.
All types of disturbance lead to an activation of the binary
signal output MST.
The types of disturbance (1 ... 3) are indicated on the front
LED signal
panel of the module (cf. chapter 'Disturbance annunciations
on the module').
STEADY LIGHT
Disturbance type 4 is indicated through signal MST.
STEADY LIGHT
The contents of the diagnosis registers, the messages on the
CDS and the annunciations ST and SG are shown in Figures
1 ... 2.
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