Emerson AC4 User Manual

Each output may be defined as Operating (OP), Standby (ST), or Not 

Used (NU). This setting takes precedence over any setting in the 

override menu (see 7.9 Override Output). 
Default settings are: 

• Outputs 1, 2 and 3 are in Operating (OP) mode
• Output 4 is in Standby (ST) mode

To change the mode:

• From the Setup Outputs Menu, shown at right, use the arrows

↑↓

 

to

 

choose Mode for the selected output and press Enter ↵.

• To change the output’s mode, use the arrows

↑↓

 to

 

choose one of 

these options:

• OP (Operating)
• ST (Standby)
• NU (Not Used)

• Press Enter ↵.

You may choose whether to Enable or Disable an output when the 

connected device is in alarm status. The default setting for all output 

points is Enabled.

• From the Setup Outputs Menu, choose In Alarm, as shown at 

right, and press Enter ↵.

• To make a change, use the arrows

↑↓

 to

 

choose E (Enable) or 

D (Disable) to determine what happens when an alarm is detected 

in the device.

• Press Enter ↵.

Each output has an associated jumper that can help prevent undesired effects when the controller 

board loses power. For example, without the proper fail-safe jumper setting, a loss of power might 

close a switch that is Normally Open (NO)—perhaps shutting off an environmental unit or a fan or 

closing a valve.
This fail-safe jumper setting is unrelated to configuring an output as Normally Open (NO) or 

Normally Closed (NC), as described in 7.6.1 Define Output as Normally Open or Normally 

Closed.
To configure a digital output jumper for a loss of power:

• Set the jumper in the “OFF” position (factory default) to make the output Normally Open (NO).
• Set the jumper in the “ON” position to make the output Normally Closed (NC).

For more information, see 3.2.3 Setting the Digital Output Jumpers.

SETUP DEVICE_1
NORM OPEN/CLOSE: NO

↑↓=NEXT

↵

=SELECT

IN ALARM: ENABLE

SET MODE: OP

↑↓=OP/ST/NU

↵

=EDIT

SETUP DEVICE_1
NORM OPEN/CLOSE: NO
MODE: OPERATING

↑↓=NEXT

↵

=SELECT

STATE OF DEVICE
IN ALARM: DISABLE

↑↓=E/D

↵

=EDIT