Honeywell UDC3500 User Manual

Monitoring and Operating the Controller
3/07 UDC3500 Universal Digital Controller Product Manual 221
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
Selections
Display Indication Action on Contact Closure
Controller returns (toggles) to original state when contact
reopens unless otherwise noted
None DI 1 2 3 4 always off*
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.
TO MAN MAN blinks
Puts the controller into manual mode. When the contact opens,
the controller returns to its former mode unless the
Man/Auto
key was pressed while the digital input was active, in that case
the controller will stay in the manual mode when the contact
opens.
TO LSP SP annunciator blinks
Lower display shows
LSP 1
Puts the controller into Local Setpoint 1. When contact opens,
the controller returns to former operation, local or remote
setpoint.
TO 2SP SP annunciator blinks
Lower display shows
LSP 2
Puts the controller into Local Setpoint 2. When contact opens,
the controller returns to former operation, local or remote
setpoint.
TO 3SP SP annunciator blinks
Lower display shows
LSP 3
Puts the controller into Local Setpoint 3. When contact opens,
the controller returns to former operation, local or remote
setpoint.
TO 4SP SP annunciator blinks
Lower display shows
LSP 4
Puts the controller into Local Setpoint 4. When contact opens,
the controller returns to former operation, local or remote
setpoint.
TO DIR
Selects direct control action.
ToHOLD H blinks
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
Run/Hold key.
This selection applies to either loop.

Honeywell UDC3500 Specifications

General

Brand	Honeywell
Model	UDC3500
Category	Controller
Language	English