Future Design MCTB 4.3 Скачать руководство пользователя страница 32

Страница: 32 / 240

MCTB

4.2.7

Event Input Function

The Event Input Function is used to select the desired mode of operation for the digital input of the loop control
board. The event input selections are mutually exclusive, i.e., selecting one will turn off the others. Once the
desired function has been selected, press the “Done” button to set the event input function for the loop control
board and return to the main Loop Configuration screen.

The

Automatic program run/abort

function will start the currently loaded program from step 1 if not already

running, upon activation of the input (an off to on transition). Deactivating the input (an on to off transition) will
stop the program if it is currently running.

The

Automatic program hold/resume

function will place a currently running program into hold when the event

input is activated (an off to on transition). The program will resume operation and return to the run mode when
the input is deactivated (an on to off transition).

The

Failure transfer

function puts the loop control outputs into failure transfer mode when the input is activated.

The output will then go to the percent output value set for failure transfer. The loop control outputs will return
to normal PID control when the input is deactivated.

NOTE:

If an automatic ramp/soak program is in operation and the loop is under program control, placing it in
failure transfer via the event input will cause the program to be placed into hold. When the event
input is then turned off and failure transfer is disabled, the program will have to be manually resumed
by either a separate event input or by selecting “Run” from the Program Operation window.

The

Automatic program run/hold

function will start the currently loaded program from step 1 if not already

running, upon first activation of the input (an off to on transition). Deactivating the input (an on to off transition)
will then cause the program to go into hold. The input must then be reactivated in order for the program to
resume operation.

The

Loop status input

function provides a visual indication on the Loop View screen in the runtime application.

When the input is activated, the border around the loop is highlighted blue. When the input is deactivated, the
border around the loop returns to the default dark gray color. This can be used as a means for alerting the user
of an operating condition, such as the equipment the loop is controlling is in operation.

The

Alarm input

function allows the event input to be used for alarm indication. When the input is activated,

the Event Input Alarm Message/Annotation (see following section 4.2.8) is displayed on the alarm screen in the
runtime application and the audible alarm sounds.

The

Data logging annotation

functions allows the event input to be used to write an annotation (operator

event) to the running data log file. When the input is activated, the Event Input Alarm Message/Annotation (see
following section 4.2.8) is written to the data file.