In thumbwheel test mode, the 56AMXN/B initially displays “Thumb Test Mode”

on the 4-character display, displays the switch settings for 5 seconds, then resumes

displaying “Thumb Test Mode”

For DCS slave operation, if the drop number and drop depth are individually valid

but the combination results in invalid drop numbers (for example, drop number 55,

drop depth 2), the module displays an error message on the 4-character display but

does not enter Thumbwheel test mode.

Prepare the Chassis for Module Installation

Before you install the 56AMXN/B module, you must install and connect a

ControlLogix chassis and power supply.

Determine Module Slot Location

The figure below shows chassis slot numbering in a 4-slot chassis. 

Slot 0 is the first slot and is always the leftmost slot in the rack (the first slot to the right of the power supply). 

You can use any size ControlLogix chassis and install the module in any slot.

You can also install multiple 56AMXN/B modules in the same chassis. 

You can install as many modules as your power supply can accommodate (i.e., number for which the power supply is rated).