ASHIDA
Station Controller ADR200A is a ‘Station-level’
controller which can communicate with multiple slave
devices like Protection relays, Meters, etc., process
this information & transmit it onwards to a remote
master. Slave protocols include IEC60870-5-103 &
MODBUS. Master protocols include IEC60870-5-101 and
SPORT. ADR2300A is ideally suited to schemes where
multiple sub-stations are to be controlled from a
single location.
This intelligent device communicates with a number
of slave devices (DI, DO Cards, Numerical Relays,
etc.) & compiles this information which serves
as a single database of the entire sub-station / post.
This compiled information can then be communicated
with RCC using standard protocol. Details: Station
Controller gathers the information from all Digital
input, digital output and analog input cards. It has
two communication ports. First port is RS232 and is
used for SCADA PC communication using SPORT/ IEC101
protocol. Second port is RS485 and is used for communication
with FCCM Cards / Numerical Relays using IEC60870-5-103
or MODBUS protocol. Station Controller performs task as :
Continuous
scanning of all FCCM cards & Numeric
relays for updated parameter values &
events.
Sending
control operation command to numeric relays
or digital output cards.
Display all acquired information locally
on LCD.
Provide all information to control room
via communication link on demand.
Sending updated parameters values to RCC
as response to commands.
Download FCCM and IO configuration.
Logic function :
The Station controller is the heart of the RTU and
as such provides ‘intelligence’ to this
functioning of the RTU. Some of the special functions
implemented in the station controller are:
< Downloading of parameters to decide number of DI, DO, AI, etc. to be scanned. Also the control operation pulse width, event window time, etc is also set from this command.
< Diagnostic commands for the SC hardware & also those of the associated cards in the RTU are supported by the station controller.
< Closed loop action. This feature enables operation of a control when certain logical criterion is met. For example this is used for automatic tripping of bridging interrupters at SP on under-voltage conditions.
< Interlock programming. Using this feature, control can be enabled or disabled depending on digital inputs. This can be used at boundary posts for grant/ release of controls
