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
84HTable 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
Action on Contact Closure
No Digital Input selection
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.
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.
Puts the recorder into local setpoint 2.
Selects direct controller action (transfer if in reverse).
“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.
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.
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