Emerson Micro Motion 3711, Configuration And Use Manual, Page: 133 / 234

Configuration and Use Manual 125
Function Sequence Tables
PID Contr
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Monitoring and Displa
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11.8.5 Control-related commands
Use Analog Output (AO), Discrete Output (DO), and Timed Duration Output (TDO) control-related
commands to control outputs.
To control the immediate physical state of an output, use the appropriate output command (see
Table 11-11). Using the database command SAV to write a value to the EU parameter of an output
affects the value from which the output level is calculated, but does not change the output directly.
If a PID loop is controlling the Analog Output, placing the PID loop into Manual Mode allows the
FST to send a value to the output parameter of the PID.
Table 11-10 Time-related commands
Name Description Arguments Results
ST Start specified Timer with specified
number of 100-millisecond intervals. • ARG1 = FST Point Database
Value
• ARG2 = Database or Constant
Value
FST Timer (ARG1) = ARG2
CT Check Timer for specified FST. • ARG1 = FST Point Database
Value
• ARG2 = LABEL
• If FST Timer (ARG1) = 0,
continue to next command.
• Otherwise: go to ARG2.
WT Suspend FST execution until specified
number of seconds (ARG1) have
elapsed. The number of seconds can
be from 0.1 to 999,999. • ARG1 = Database or Constant
Value
Delay ARG1 seconds
DWK
(1)
(1) Before using the DWK and MND functions, ensure that the real-time clock on the Model 3711 is set correctly.
Sets RR(out) to the day of the week
(1=Sunday, 7=Saturday). None RR(out) = Day of Week
MND
(1)
Sets RR(out) to the number of minutes
past midnight. None RR(out) = Minutes
Table 11-11 Control-related commands
Name Description Arguments Results
AO Analog Output. Sets the EU value of
the specific Analog Output point to the
argument value.
(1)
(1) If the output is in manual mode, the command is not performed. This Manual Mode check allows the FST to continue operation while
the remote device is being serviced.
• ARG1 = AO Point Database
Value
• ARG2 = Database or Constant
Value
AO Output(ARG1) = ARG2
DO Discrete Output. Sets the status of the
specified Discrete Output point to the
argument value. • ARG1 = DO Point Database
Value
• ARG2 = Database or Constant
Value
DO Output(ARG1) = ARG2
TDO Timed Duration Output. Activates a DO
point configured as a TDO or TDO
Toggle. This command requires that
you write a value to the EU Value
parameter prior to TDO command. • ARG1 = DO Point Database
Value
DO Output(ARG1)