Types Of Commands; Description - Siemens SIPROTEC 7UM62 Manual

Functions
2.50 Command Processing
2.50.2

Types of Commands

In conjunction with the power system control the following command types can be distinguished for the device:

2.50.2.1 Description

Commands to the System
These are all commands that are directly output to the switchgear to change their process state:
• Switching commands for the control of circuit breakers (not synchronized), disconnectors and ground elec-
trode,
• Step Commands, e.g. raising and lowering transformer LTCs
• Set-point commands with configurable time settings, e.g. to control Petersen coils
Internal / Pseudo Commands
They do not directly operate binary outputs. They serve to initiate internal functions, simulate changes of state
or to acknowledge changes of state.
• Manual overriding commands to manually update information on process-dependent objects such as indi-
cations and switching states, e.g. if the communication with the process is interrupted. Manually overridden
objects are flagged as such in the information status and can be displayed accordingly.
• Tagging commands (for "Setting") for internal object information values, e.g. deleting / presetting switching
authority (remote vs. local), parameter set changeovers, data transmission blockage and metered values.
• Acknowledgment and resetting commands for setting and resetting internal buffers or data states.
• Information status command to set/delete the additional "information status" of a process object, such as:
– Input blocking
– Output Blocking
350
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010