3.12.2 Panel Mounted I/O Cards - Siemens ST950 Plus+ User Manual

ST950 Plus+ User Manual
Panel Mounted I/O Cards
3.12.1 Overview
The need to use I/O cards in a Plus
performed by the Nodes directly. However, the standard ST950 I/O cards are supported for cases
where centrally located I/O is required, for example to support a free standing OTU or MOVA unit.
The panel mounted I/O Cards are mounted on the rear panel of the controller cabinet and allow
direct termination of street cabling without resorting to the use of additional terminal blocks and
soft wire conversion kits.

3.12.2 Panel Mounted I/O Cards

The standard I/O card provides a rugged interface for up to 24 TOPAS 2523 compliant digital inputs
and up to 16 TOPAS 2523 compliant changeover outputs.
A sub-equipped variant of this card is also available, fitted with only 4 changeover outputs. If the
IC4 Configuration requires the 24 in / 4 out variant but one is not available, then a 24 in / 16 out
card can be fitted in its place.
The I/O card connects to the CPU Card or previous I/O card via the GSPI interface cable through
which the card also obtains its power supply.
IO Card Fuse
The IO card is safety-protected by a fuse. Situated beneath the metal cover plate. Should the
fuse fail, the card will indicate a major fault and the card should be replaced. Do not replace
the fuse as the card may have been damaged and must be replaced.
ST950 Plus+ User Manual
system is much reduced since most I/O functionality is
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