Functions
6-1777SJ62 Manual
C53000-G1140-C121-1
6.20.2 Steps in the Command Sequence
Safety mechanisms in the command sequence ensure that a command can only be
released after a thorough check of preset criteria has been successfully concluded.
Standard Interlocking checks are provided for each individual control command. Ad-
ditionally, user-defined interlocking conditions can be programmed separately for
each command. The actual execution of the command is also monitored afterwards.
The entire sequence of a command is described briefly in the following:
Check Sequence • Command Entry (e.g. using the keypad on the local user interface of the device)
− Check Password → Access Rights
− Check Switching Mode (interlocking activated/deactivated) → Selection of Deac-
tivated Interlocking Recognition
• User configurable Interlocking checks that can be selected for each command
− Switching Authority (local, remote)
− Device Position (scheduled vs. actual comparison)
− Zone Controlled/Field Interlocking/ (logic using CFC)
− System Interlocking (centrally, using SCADA system or substation controller)
− Double Operation (interlocking against parallel switching operation)
− Protection Blocking (blocking of switching operations by protective functions)
• Fixed Command Checks
− Internal process time (software watch dog which checks the time for processing
the control action between initiation of the control and final close of the relay con-
tact. After 1 second the control action will be aborted).
− Setting Modification in Process (if setting modification is in process, commands
are denied or delayed)
− Equipment not Present at Output (If a circuit breaker or other operable equipment
is not configured to a binary output, then the command is denied)
− Output Block (if an output block has been programmed for the circuit breaker,
and is active at the moment the command is processed, then the command is
denied)
− Component Hardware Malfunction
− Command in Progress (only one command can be processed at a time for one
circuit breaker or switch)
− 1-of-n-check (for schemes with multiple assignments, such as common ground,
whether a command has already been initiated for the affected output relay is
checked).
Monitoring the
Command Execu-
tion
− Interruption of a Command because of a Cancel Command
− Running Time Monitor (feedback message monitoring time)
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