MERRICK MC3 35.00.EX, Operation And Maintenance Manual, Page: 20 / 69

Unchanged Local Setpoint
The “
Local On Screen
” text indicates the current setpoint method. Possible methods that
can be displayed are:
•
Local On Screen
. The setpoint is entered here, in the Setpoint Screen, by using the
Numeric
button.
•
Remote discrete inputs.
A signal to a configured analog input is used for the batch
setpoint.
•
Network inputs
. The setpoint is written to the controller using one of the available
communication protocols. See Comm Settings on page 43.
•
Network (Fallback to Local)
. Network inputs are used as long as there is no
communication timeout. If a timeout occurs, the Local setpoint is used.
•
Local (Fallback fr Network)
. Local inputs are used because there is a
communication timeout. Before the timeout occurred, the
Network (Fallback to
Local)
setpoint was used.
•
Network (Fallback to Remote)
. Network inputs are used as long as there is no
communication timeout. If a timeout occurs, the Remote setpoint is used.
•
Remote (Fallback fr Network)
. Remote inputs are used because there is a
communication timeout. Before the timeout occurred, the
Network (Fallback to
Remote)
setpoint was used.
The fallback scheme is engaged by turning on the
Force Comm SP
logical input. See
Logical Inputs, on page 35.
The “
Curr: 10.00 lb
” text indicates your current batch setpoint value.
You change the setpoint method with the
Local
button. The text on the button will cycle
through
Local
,
Remote
,
Network
and
Manual
.
NOTE! The
Manual
alternative is only available in the Idle state. The
Numeric
button is only
available in
Local
or
Manual
setpoint method.
As soon as you push the setpoint method button, a new button,
Accept,
occurs:
Changing the Setpoint Method
The number between the
Remote
and
Accept
button indicates what the new setpoint
value will be, should you choose to accept.
The new setpoint method will not take effect until you press the
Accept
button.
35.00.EX O&M Manual 16