Model 5600ACO2 Automatic Changeover Unit
3.3.1. GPI Input Mode
DIP Switch 1 is used to select one of two modes of operation for Manual GPI changeover mode. (See
section 3.2.2 for more information about Manual GPI changeover mode)
DIP 1 GPI Input Mode
Off (Up) GPI Changeover Mode – single GPI input
On (Down) GPI Changeover Mode – dual GPI input
Table 3-2: GPI Input Mode Switch Settings
When DIP switch 1 is in the Off position, the ACO GPI inputs on the top row of the terminal strip on the
rear panel are used in conjunction with the front panel switches to control whether the A or B inputs will
be selected. Set the front panel CHANGEOVER MODE switch to the Manual position and the
MANUAL CONTROL MODE switch to the GPI position. (See section 3.2.2)
GPI 1 GPI 2 Operation
Low --- Master A inputs selected
High --- Master B inputs selected
Table 3-3: Single GPI Mode Operation
In single GPI mode the 5600ACO2 is controlled by the ACO GPI1 input on the top row of the terminal
strip on the rear panel. GPI2 is not used in this mode. When GPI1 is low Master A will be selected.
When GPI1 is high Master B will be selected. The OUTPUT LEDs will indicate the currently selected
master. Single GPI mode is the default condition.
GPI 1 GPI 2 Operation
Low Low Current bank selected (no change)
Low High Master A inputs selected
High Low Master B inputs selected
High High Current bank selected (no change)
Table 3-4: Dual GPI Mode Operation
In dual GPI mode the 5600ACO2 is controlled by both the ACO GPI1 and ACO GPI2 inputs on the top
row of the terminal strip on the rear panel. When GPI1 is low and GPI2 is high, Master A will be
selected. When GPI1 is high and GPI2 is low Master B will be selected. When both inputs are high or
low, no action will be taken. The OUTPUT LEDs will indicate the currently selected master.
Page 3-4
Revision 1.3 OPERATION
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