ABB REL 551 2.3 Series Installation And Comissioning Manual page 122

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Single command (CD)
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For the single command function block, it is necessary to configure the output signal to
corresponding binary output of the terminal. The operation of the function is then
checked from the local HMI by applying the commands with the MODE Off, Steady,
or Pulse and by observing the logic statuses of the corresponding binary output.
Command control functions included in the operation of different built-in functions
must be tested at the same time as their corresponding functions.
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