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Operation
-
Digital
Input Option (Remote Switching)
Release M
DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual
143
April 2017
5.12 Digital Input Option (Remote Switching)
Introduction
The digital input option detects the state of external contacts wired to it. On contact closure, the recorder
responds according to how each digital input is configured.
Make your selection under Set Up group “CONTROL1” or “CONTROL2”, function group prompt
“REM SW”: see
Subsection 3.10—Table 3-7
or
Subsection 4.6—Table 4-5.
Action on contact closure
Table 5-26 lists the configuration prompt selections, the “Action on Contact Closure”, and the display
indication for each selection available.
Table 5-26 Digital input option action on contact closure
REM SW
Selections
Display Indication
Action on Contact Closure
None
None
No Digital Input selection
To MAN
“MAN” blinks
Puts the recorder into manual mode; contact open
returns the recorder to former mode unless
AUTO/MAN
key is pressed while digital input is active.
To LSP
“RSP” blinks
Puts the recorder into local setpoint 1(switches out of
remote). When contact opens, the recorder returns to
former operation unless the
FUNC
key is pressed while
digital input is active.
To 2SP
“RSP” blinks
Puts the recorder into local setpoint 2.
To DIR
None
Selects direct controller action (transfer if in reverse).
RN/HOLD
“H” blinks in upper display
Suspends setpoint program or setpoint ramp.
Keyboard takes priority over external switch for
RUN/HOLD function.
Contact open runs the program or ramp.
If initially in the HOLD state, close then open the
contact to remotely start the SP ramp or program.
TUNE
TUNING x
Initiates Accutune.
Keyboard operation
If a particular mode or parameter is selected by the contact closure, using the keyboard to select the same
parameter ensures that the selected mode will be maintained after the remote digital switch is reopened.