PAO command source options

Use the
Command Source Configuration
 tab on the
PAO Properties
 dialog box to select the command sources that exist for the instruction and to specify the priority of simultaneous requests for command sources, the command source during normal operation, and the command source on startup.
To configure command source options for Process Analog Output (PAO) instructions
  1. On the instruction in the routine, perform one of these actions:
    • On the Ladder or FBD instruction, select .
    • In the Structured Text editor, right-click the tag name and select
      Configure <tag name>
      .
  2. Select the
    Command source > Source configuration
     tab.
  3. Select the check box for each command source that exists for the instruction:
    • Operator (unlocked)
    • Program (unlocked)
    • Operator Locked
    • Program Locked
      IMPORTANT:
      You can change the setting for these four check boxes only offline, when the controller is in PROG mode, or when the instruction is scanned with EnableIn False (Programmed Out of Service):
      • Operator (unlocked)
      • Program (unlocked)
      • Operator Locked
      • Program Locked
        • External
        • Maintenance
        • Maintenance Out of Service
  4. To set the normal, or default, command source, under
    Command source which is considered normal
    , select
    Program
     or
    Operator
    .
  5. To set the priority in case of simultaneous commands, under
    Command source which has priority
    ,
    select
    Program
    or
    Operator
    .
  6. To set the command source that is used when the device powers up, under
    Powerup command source
    ,
    select
    Program
     or
    Operator
    .
  7. Select the check boxes of parameters to use as level or edge:
    • PCmd_Prog used as level (1 = Program, 0 = Operator)
      . When selected, PCmd_Prog works as level: setting the PCmd_Prog parameter to 1 selects Program as the command source and clearing PCmd_Prog to 0 selects Operator as the command source. When this check box is cleared, PCmd_Prog and PCmd_Oper work as edge: setting the PCmd_Prog parameter to 1 requests Program as the command source, setting PCmd_Oper to 1 requests Operator as the command source, and these commands are cleared by the instruction automatically.
    • PCmd_Lock used as level (1 = Lock, 0 = Unlock)
      . When selected, PCmd_Lock works as level: setting the PCmd_Lock parameter to 1 locks Program as the command source and blocks Operator as the command source and clearing PCmd_Lock to 0 unlocks Program as the command source and allows Operator to be selected. When this check box is cleared, PCmd_Lock and PCmd_Unlock work as edge: setting PCmd_Lock to 1 locks Program as the command source, setting PCmd_Unlock to 1 unlocks Program as the command source, and these commands are cleared by the instruction automatically.
    • XCmd_Acq used as level (1 = Acquire External, 0 = Release External)
      . When selected, XCmd_Acq works as level: setting the XCmd_Acq parameter to 1 requests External command source, and clearing XCmd_Acq to 0 releases External command source. When this check box is cleared, XCmd_Acq and XCmd_Rel work as edge: setting XCmd_Acq to 1 acquires External command source, setting XCmd_Rel to 1 releases External command source, and these commands are cleared by the instruction automatically.
  8. To allow
    External
    as the command source even if the instruction is locked in Program or Operator, select the
    External supersedes Program Locked or Operator Locked
     check box.
    When the command source is External, External commands and settings are accepted, including commands such as XCmd_Start and XCmd_Stop, and settings such as XSet_SP. External devices and systems that can control an object include a SCADA master system or local pilot devices, such as buttons, switches, and pilot lights.
  9. To allow priority logic to select
    Override
    as the command source even if the instruction is locked in Program or Operator, select the
    Override supersedes Program Locked or Operator Locked
     check box. When the command source is Override, the instruction accepts the Override Command Input, Inp_OvrdCmd, and other override settings.
  10. Select
    Apply
    .
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