Iskra FPC 200 - Page 99

Communication
USER MANUAL FPC 200 - 3/2017 99
3.2.3.1 Monitor direction
Defines direction of transmission from the protection
equipment to the control system. Primarily it is used to
send cyclic and event information transmission requests
of master to the slave device/s.
 Class 1 data pooling is usually used for event
type of transmission.
 Class 2 data pooling is usually used for Cyclic
sending of data. Typically for metering
information.
COT
Label
Description
1
Spontaneous
Date-tagged event
information.
2
Cyclic
Cyclic produced Metering
information.
3
Reset (FCB)
Response to the reset the
frame count bit.
4
Reset (CU)
Response to the reset
communication unit.
5
Start/restart
Response to the command
to initialise a
communication.
8
Time synchronization
Response to the time
synchronization command.
9
General
interrogation
Response according to GI
request.
10
End of General
interrogation
Termination massage of the
general interrogation cycle.
12
Remote operation
A change of status resulted
by a master command.
20
Positive
acknowledgement
Positive response of the
generic write command.
21
Negative
acknowledgement
Negative Response of the
generic write command.
Table 103 Supported COT numbers in monitor direction.
3.2.3.2 Control direction
Defines direction of transmission from the control
system to the protection equipment. Typically for:
 sending control commands
 time synchronization commands
 Executing of start/reset communication
commands.
COT
Label
Description
8
Time
synchronization
Time synchronization
command.
9
General
interrogation
Initialization of a general
interrogation cycle.
20
General command
Response to the reset the
frame count bit.
Table 104 Supported COT numbers in control direction.
3.2.3.3 The device initialization
Whenever the device has started, a Start/restart
procedure is required to initialise a communication.
The device communications can be reset using either
the Reset CU or Reset FCB command. The Command
Reset CU will also clear any unsent massages while
Reset FCB will only initialise the communication.
3.2.3.4 Time synchronization
The device date and time can be synchronized using the
standardized synchronization command. The command
can be send to individual with confirm request or to all
devices with no reply request (address 255). The device
also accounts time synchronization correction according
to this standard.
3.2.3.5 General interrogation
General interrogation represents group of data, general
information about the status of the device. If GI is
requested the device will respond with the data as
marked in Table 106. This data is also transmitted
spontaneously (COT 1).