Intelligent Detector Backplane Card - Siemens ST950 Plus+ User Manual

ST950 Plus+ User Manual

Intelligent Detector Backplane Card

The Intelligent Detector Backplanes (IDB) are mounted within the rack. Each IDB provide support
for the connection of up to 4 Loop Detector Cards, such as Siemens SLD4 or the WiMag Loop
Replacement Card.
The IDB connects via a ribbon cable to the Loop Termination Board mounted on the cabinet rear
panel. The Loop Termination Board provides the termination point for 16 Loop Feeder pairs,
without the use of any additional terminal blocks and twisted wire kits.
The Intelligent Detector Backplane itself connects to the CPU Card, or previous Intelligent
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Detector Backplane, via the GSPI interface serial cable through which the card also obtains its
power supply.
The Loop Detector supply is cabled separately as shown in Figure 26. This supply is derived from
the system 24VDC PSU. An appropriate wiring kit is required.
If required, a twisted ribbon cable provides the connection between the loop detector cards and
the road loops, via the loop termination card. The SLD4 /950 variant also includes additional
connectors to allow the SLD4 loop detector auto-configuration communications link to be wired
between multiple backplanes within a controller.
In terms of a linked communications chain
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ST950 Plus+ User Manual Page 51 of 176 Issue 2
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