Control Methods - ABB RELION REX640 Technical Manual

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Control functions

After each operation the motor is paused for one second before any new control

command can pass through.

Control methods

The command execution mode can be set with the Control model setting. The

alternatives for command execution are direct control and secured object control,

which can be used to secure controlling.

The secured object control SBO is an important feature of the communication

protocols that support horizontal communication, because the command reservation

and interlocking signals can be transferred with a bus. All secured control operations

require two-step commands: a selection step and an execution step. The secured object

control is responsible for several tasks.

Command authority: ensures that the command source is authorized to operate

Mutual exclusion: ensures that only one command source at a time can control the

Interlocking: allows only safe commands

Execution: supervises the command execution

Command canceling: cancels the controlling of a selected object

In direct operation, a single message is used to initiate the control action of a physical

device. The direct operation method uses less communication network capacity and

bandwidth than the SBO method, because the procedure needs fewer messages for

accurate operation.

1MRS759142 C

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