ST950S Plus+ Installation and Commissioning Manual
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
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.
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
•
GSPI and SPB bus interfaces
•
I2C interface for Aspect Mimics
•
Zero crossing interface
•
CPUA and CPUB microprocessors
•
EEPROM / FRAM for inventory, identification and fault information
•
Lightning protection for the RS485 ring/arm interfaces
•
Diagnostic LEDs
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