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 REMOTE TERMINAL UNIT
 
A RTU is best in used when there is no need for local processing. A RTU can be specially designed to suit the AGL application with low cost. A RTU can be small (CPU, communication and I/O embedded on a single card) for a substation with a small amount of Input/output point count.
A large local system where I/O point count is large, a RTU design similar to the FEP using Industrial Graded Computer can be employed. High speed parallel bus line card is installed on each Industrial PC and connected to the shared I/O module using a switcher card.

RTU I/O Card Type : 
STDO32: 32 points Digital Output with 2A relay contact
STDI32: 32 points Digital Input with relay isolation
STDI32O: 32 points Digital Input with opto isolation
STSWR: I/O sharing Switcher Card for 2 CPU,2 I/O BUS
ST20: 1 channel FSK MODEM Module
ST30: 2 channel FSK MODEM Module
STAI8: 8 channel precision Analog input module

  Photo Gallery


 
 
Front End Processor (FEP) Which Consist Of Main And Standby ST6000 Controller, Switcher Card
 		 Front End Prpcessor (FEP) Input/ Output Rack

 
 
AGL Control System Wall Mounting Marchalling Box Internal View Of Marshalling Box Shows Input/Output Relay
Termination Cards With LEDS Indicators
 

 
 
Front End Processor (FEP) Termination Rack For Termination Of All Connections Between FEP And Marshalling Box
 		 Constant Current Regulator (CCR) Cabinets
   

  Detail View

  Technical specification

 Processor
 CPU Motorola MC68HC000 microprocessor
 CPU Speed 12.000 MHz
 RAM 128K 16-bits Non-volatile static RAM (backup by Lithium battery up to 10 years without power)
 EPROM Standard 64K 16-bits CMOS EPROM upgrade-able to 128K 16-bits CMOS EPROM or 128K 16-bits Non-volatile static RAM to enable program uploading through serial port.
 EEPROM Optional 64K bytes EEPROM
 Real Time Clock Nonvolatile DS12C887 RTC (backup by lithium battery for 10 years without power). RTC format: sec/min/hour/weekday/day/month/year
Hardware Year 2000 compliance
 LCD display 2 rows x 20 characters Liquid Crystal Display (LCD)
 Keypad 4 x 4 matrix medium duty keypad
 Communication
 Serial Port 4 serial ports (Asynchronous Communication Interface Adapter / ACIA)
 COMM Port 1: For RS232 serial connection to SCADA MMI computer (Telemetry) Or for RS232 communication to V.23 FSK MODEM BUS (AGLCS)
 Interface RS232C with RTS and CTS
 RS-232 connector type DE-9 male with retention screws (DTE)
 Data length 7 or 8 data bits
 Duplex Full or half with RTS/CTS handshaking
 Data Parity Odd, even or none
 Baud Rate 50,300,600,1200,2400,4800,9600,19200 baud programmable
 COMM Port 2: For RS485 or TTL serial connection to Radio MODEM (Telemetry) Or For RS485 4-wire communication to AGLCS SCADA MMI (AGL Control System)
 RS-232 connector type DE-9 male with retention screws (DTE)
 Duplex Full or half with RTS handshaking
 Data length 7 or 8 data bits
 Data Parity Odd, even or none
 Baud Rate 50,300,600,1200,2400,4800,9600,19200 baud programmable
 COMM Port 3: For RS485 2/4-wire communication to display board (telemetry)
For RS485 4-wire communication port between standby/main CPU controller for hot backup redundancy data exchange requirement (AGLCS)
 Interface RS232C or 2/4 wire RS485
 RS-232 connector type DE-9 male with retention screws (DTE)
 Data length 7 or 8 data bits
 Data Parity Odd, even or none
 Baud Rate 50,300,600,1200,2400,4800,9600, 19200 baud programmable
 COMM Port 4: For RS232 serial connection to GSM/PSTN MODEM (Telemetry)
Or For RS232 communication to V.23 FSK MODEM BUS 2 (AGLCS)
 Interface RS232C with RTS and CTS
 RS-232 connector type DE-9 male with retention screws (DTE)
 Data length 7 or 8 data bits
 Duplex Full or half with RTS/CTS handshaking
 Data Parity Odd, even or none
 Baud Rate 50,300,600,1200,2400,4800,9600,19200 baud programmable

 Input/Output

 Digital input points 8 general digital input points
 Digital output points 5 volt-free contact outputs, current rating 1A each.
 Expansion Port (Parallel
Interface Bus)		 Through Parallel Interface Adapter (PIA) 1 & 2. Interface to a rich set of EUROCARD size input/ Output Module with back plane such as 32 point Digital Input Module, 32 point Digital Output module, 4 points 4-20mA analog Output module, 8 point 4-20mA Analog input module. Every expansion port capable of interface to 16 nos of input/output modules.
 Printer Port Printer port can be implemented through any of the Parallel Interface Adapter (PIA) channel available. For printing online event / alarm on tractor feed dot matrix printer.
 High Speed Counter 1 channels, maximum response 1 KHz (Opto-coupler isolation of channel provided)

 Fail Save Features
 Watchdog timer External watchdog timer with 1.6S time-out period Automatic reset CPU when fault detected / when program hang
Can be enabled or disabled by jumper setting

 Power Supply
 Supply 11V - 24V DC unregulated supply or 12-24V AC supply direct from step down transformer
 Regulator On-board 5V regulator from unregulated 12V-24 AC/DC supply Onboard battery charger for Sealed Lead Acid Battery (12VDC, 1A)
 Overvoltage protection 27V varistor on unregulated supply voltage and 6.8V zener diode on regulated 5V supply
 Power consumption Typical 250mA

 Status Indication
 Power supply status Power ON LED
 Processor status RUN (Processor Program Healthy), HALT (Hang) , RESET
 Digital output status 6 LEDs indicators for 6 replay contact output
 Pulse Input status 1 LEDs indicators for 1 pulse input points
 Comm Port activity status TxD, RxD, RTS, CTS LEDs indication for each serial port

 Communication

 Communication Media Leased Line, PSTN, Radio, trunk radio, INMARSAT-C, ORBCOMM,GSM
 Telemetry Protocol X3.28, HDLC, Modbus RTU, Modbus ASCII
   
 
 
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