Honeywell UDC 3300 manual Digital Input Option Remote Switching, Introduction Action on closure

5.18 Digital Input Option (Remote Switching)

Introduction

Action on closure

The Digital Input option detects the state of external contacts for either of two inputs. On contact closure, the controller will respond according to how each digital input is configured. If the controller is configured for either 2-loop or Cascade control, then switch #1 operates only on Loop 1 and switch #2 operates only on Loop 2.

Make your selection under the Option Set Up group function prompt “DIG IN1” or “DIG IN2.” See Section 3 – Configuration .

Table 5-30 lists the configuration prompt selections, the “Action on Closure,” and the display indication for each selection available.

Table 5-30 Digital Input Option Action on Contact Closure

DIG IN1 or

DIG IN2

Selections

None

Display Indication

DI 1 2 always off*

Action on Contact Closure

Returns (toggles) to original state when contact opens,

unless otherwise noted.

No Digital Input selection

*The Digital Input Annunciator will always show the Digital Input status.

TO MAN

TO LSP

TO 2SP

TO 3SP

TO DIR

ToHOLD

ToPID2

PV 2IN

PV 3IN

RERUN

MAN blinks

RSP annunciator blinks

RSP annunciator blinks

Hblinks

PIDSET 2 in lower display

II(II blinks)

IN

III(III blinks)

IN

Puts the controller into manual mode. Contact open returns the

controller to former mode unless MANUAL/AUTO key is pressed

while digital input is active, then it stays in the manual mode.

Puts the controller into local setpoint 1. When contact opens, the controller returns to former operation, local or remote setpoint, unless

the SETPOINT SELECT key is pressed while digital input is active,

then it stays in the local setpoint mode.

Puts the controller into local setpoint 2. When contact opens, the controller returns to former operation, local or remote setpoint, unless

the SETPOINT SELECT key is pressed while digital input is active,

then it stays in the local setpoint 2 mode.

Puts the controller into local setpoint 3. When contact opens, the controller returns to former operation, local or remote setpoint, unless

the SETPOINT SELECT key is pressed while digital input is active,

then it stays in the local setpoint 3 mode.

Selects direct controller 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 RUN/HOLD key. This selection

applies to either loop.

Selects PID set 2.

Selects the PV to equal Input 2.

Selects the PV to equal Input 3.

Resets the Setpoint program back to the beginning of the first segment in the program and leaves the program in the same Run or Hold mode that it was in when the DI closed. Opening the DI has no further affect.

186 UDC 3300 Controller Product Manual 4/00