ABB 88TK50-E/R1210 Descrizione del modulo e dell'applicazione - Pagina 5
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Standard FDDI interface
The standard FDDI interface is located on the module front
(connectors X2 and X3).
The module is connected directly to the FDDI ring via connec-
tors X2 and X3. According to the FDDI standard, this ring has
to be designed as a double ring (optical---fibre ring 1 and opti-
cal---fibre ring 2) for redundancy reasons.
The FDDI interface consists of two disconnectable optical
transceivers with integrated connectors, of a PHY A unit, of a
PHY B unit and of a medium ---access---control component
(MAC).
The PHY B unit is assigned to connector X2, i.e. X2 includes
the signal input from optical---fibre ring 2 and the signal output
to optical---fibre ring 1.
The PHY A unit is assigned to connector X3, i.e. X3 includes
the signal input from optical---fibre ring 1 and the signal output
to optical---fibre ring 2.
Controlled by the FDDI protocol, the MAC component sends
and receives the data either via optical---fibre ring 1 or optical---
fibre ring 2.
Instructions for coupling to the FDDI:
Acc. to the ISO/IEC 9314 standard, the following type of con-
nection is to be used:
• For distances of up to 2 km between two PROCONTROL
stations, multi ---mode optical---fibre cables with Duplex SC
connectors
To avoid an incorrect connection between optical---fibre ring 1
and optical---fibre ring 2 during cabling, the optical cable
always has to be connected to connector X2 and to connector
X3.
Test and service interface
The test and service interface is located on the module front
(connector X1).
It is used for test purposes only.
Monitoring interface
The module is equipped with three potential---isolated signal
inputs MSP , MTE and MTK to which external disturbance an-
nunciation signals can be connected. The general disturbance
annunciation of the station can be put out via the isolated
binary signal output MST.
The isolated binary signal output MSX is not used at the time.
Input MSP uses the closed ---circuit principle for monitoring the
cabinet power supply. This monitoring function allows to
detect whether the power supply for the station modules has
failed. If input MSP is not used, contact X21/z20 must be
connected to Z, and contact X21/b20 to USA and USB.
Input MTE uses the open ---circuit principle and is intended, for
instance, for external cabinet temperature monitoring.
Input MTK uses the open ---circuit principle. This input may be
used for external door monitoring.
In case one of these disturbance signals are present, an entry
is made into the diagnosis register and a signal is put out via
binary signal output MST.
Interface for dual---channel station---bus cou-
pling
The 88TK50 module is provided with an interface which allows
dual---channel coupling of a station to the PROCONTROL
remote bus (FDDI interface) via a second coupling module.
The interface for dual---channel station ---bus coupling is con-
nected to the interface of the partner module by plugging ---in
the partner module (into its reserved slot).
In the case of dual---channel station ---bus coupling, both
88TK50 modules alternately control the protocol procedure
within the station and data communication of the station via
the PROCONTROL remote bus (FDDI interface) and the
station bus.
After every four complete station cycles, the active module
switches over to the partner module which has been passive
so far.
In addition to the self ---diagnosis features, the active module is
being monitored by the passive partner for proper functioning.
For this purpose, a cyclic data exchange takes place between
both modules via the interface for dual---channel station ---bus
coupling. Thus, it is ensured that both modules are in opera-
tional condition.
If a malfunction is detected, the partner module will switch off
the defective module's bus drivers connected to the station
bus and to the PROCONTROL remote bus (FDDI interface).
The defective module must be replaced to re ---establish the
state of redundancy.
The fault condition is signalled to the PROCONTROL system
by an entry in the diagnosis register of the active module and
is indicated by the red LEDs ST and SG on the front panel of
the defective module.
88TK50/R1210
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