Siemens siprotec 7SA522 User Manual

2.22 Command processing
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7SA522 Manual
C53000-G1176-C155-3
• Acknowledgment and resetting commands for setting and resetting internal buffers
or data stocks.
• Information status commands to set/delete the additional “Information Status” item
of a process object, such as
– Acquisition blocking,
– Output blocking.
2.22.1.2 Sequence in the Command Path
Security mechanisms in the command path ensure that a switch command can be
carried out only if the test of previously established criteria has been successfully com-
pleted. Additionally, user-defined interlocking conditions can be configured separately
for each device. The actual execution of the command is also monitored after its re-
lease. The entire sequence of a command is described briefly in the following.
Checking a
Command
Please observe the following:
• 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 status.
• User configurable interlocking checks:
– Switching authority,
– Device position check (set vs. actual comparison);
– Zone controlled / bay interlocking (logic using CFC);
– System interlocking (centrally via SICAM);
– Double operation (interlocking against parallel switching operation);
– Protection blocking (blocking of switching operations by protective functions);
– Check (synchronism check before a close command).
• Fixed commands:
– 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);
– Configuration in process (if setting modification is in process, commands are re-
jected or delayed);
– Equipment not present at output (if controllable equipment is not assigned 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 de-
nied);
– Component hardware malfunction;

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English