Digital Input Option (Remote Switching); Table 4-19 Digital Input Option Action On Contact Closure - Honeywell UDC3500 Product Manual

4.15 Digital Input Option (Remote Switching)

Introduction
The Digital Input option detects the state of external contacts. On contact closure, the
controller will respond according to how each digital input is configured. If the controller
is configured for either Two Loop or Cascade control, then how the switches are
allocated between the two loops must be defined. See Section 3.22.
Action on closure
Table 4-19 lists the configuration prompt selections, the "Action on Closure," and the
display indication for each selection available.

Table 4-19 Digital Input Option Action on Contact Closure

Digital Input Display Indication
Selections
None DI 1 2 3 4 always off*
TO MAN MAN blinks
TO LSP SP annunciator blinks
Lower display shows
LSP 1
TO 2SP SP annunciator blinks
Lower display shows
LSP 2
TO 3SP SP annunciator blinks
Lower display shows
LSP 3
TO 4SP SP annunciator blinks
Lower display shows
LSP 4
TO DIR
ToHOLD H blinks
3/07
Controller returns (toggles) to original state when contact
No Digital Input selection
* If a Digital Input is configured for some action, then its
associated Annunciator will always show its status; ON for
Active (switch closed) and OFF for inactive (switch open).
Annunciators for Digital Inputs configured as NONE will always
stay off whether the switch is closed or open.
Puts the controller into manual mode. When the contact opens,
the controller returns to its former mode unless the
key was pressed while the digital input was active, in that case
the controller will stay in the manual mode when the contact
opens.
Puts the controller into Local Setpoint 1. When contact opens,
the controller returns to former operation, local or remote
setpoint.
Puts the controller into Local Setpoint 2. When contact opens,
the controller returns to former operation, local or remote
setpoint.
Puts the controller into Local Setpoint 3. When contact opens,
the controller returns to former operation, local or remote
setpoint.
Puts the controller into Local Setpoint 4. When contact opens,
the controller returns to former operation, local or remote
setpoint.
Selects direct control action.
Suspends setpoint program or setpoint ramp operation. Contact
open runs the ramp/program from the Hold point unless the
Ramp/Program was not previously started via the
This selection applies to either loop.
UDC3500 Universal Digital Controller Product Manual
Monitoring and Operating the Controller
Action on Contact Closure
reopens unless otherwise noted
Man/Auto
key.
Run/Hold
221