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ST950 Plus+ User Manual
ST950 Plus+ User Manual
Page 16 of 176
667/HE/53000/000
Issue 2
Unrestricted
Plus+ System Components: An Overview
2.1.1
ST950 CPU Card
The CPU Card performs all high-level control functions for the junction and communicates with
the peripheral I/O cards and CIC cards using high speed serial communication protocols. The
physical interfaces are the same as those used in the existing ST950 family of controllers.
The ST950 family use an updated I/O card protocol which improves system performance and adds
functionality. This protocol is known as GSPI - Generic Serial Peripheral Interface. Typically, the
need to use I/O cards in a Plus
+
system is much reduced because most I/O functionality is
performed by the Nodes directly. However, where I/O cards are required these may be fitted in
the cabinet. ST950 compatible I/O cards are easily recognized by the text 'I/O CARD
667/1/32990/95x' printed on the board cover.
Reference Section 3.12 and 3.13 for further information.
2.1.2
CIC (Cabinet Interface Card) and CTB (Cabinet Termination Board)
The Plus
+
Cabinet Interface Card (CIC), along with its associated Cabinet Termination Backplane
(CTB), provides for connection and communications to the remote street equipment. It also
provides for the control and monitoring of system power.
The CIC interfaces with, and is ultimately controlled by, the ST950 CPU PCB.
The CIC, fitted to its associated CTB, is situated within the controller cabinet in a similar fashion to
how the ST950 ELV controller mounts its Lamp Switch Card assemblies and are typically mounted
on the side walls of the controller.
Up to three CICs may be fitted in the controller cabinet. For complex installations requiring a large
number of street terminations an additional cabinet may be deployed, housing a maximum of
three additional CICs.
Street wiring is terminated directly to the CTB via cage clamp terminal blocks. The CTB in turn
routes its connected signals to the CIC via DIN standard connectors.
The CIC is fitted with a metallic cover to provide a degree of protection from accidental contact.
However, there are no hazardous voltages present on the PCB.
Key Features:
•
Provision for 3-off rings or 6 arms
•
Input for up to 3-off 48V DC Power supplies
•
48V PSU monitoring inputs
•
Relays for isolation of the 48V supply to the 3 rings/arms
•
Relay monitoring for functional test and Power bank overcurrent
•
Mosfets for the disconnection of the 48V supply to the 12 passive safety arms
(not currently
used)
•
GSPI and SPB bus interfaces
•
I2C interface for Aspect Mimics
•
Zero crossing interface