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SNAP-RCK-M2B Rack Adapter Installation

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Introduction

SNAP PAC I/O processors (brains and rack-mounted controllers) are 
designed to mount on SNAP PAC racks. However, if you have an 
older system and you need to use a SNAP PAC brain or rack-
mounted controller on an existing SNAP B-series rack, the SNAP-
RCK-M2B rack adapter makes it possible. 

The adapter works with the following part numbers:

Important Notes

Change in height: 

The adapter adds 0.675 inches (1.715 cm) to 

the overall height of the unit. 

Change in connector location: 

After installation of the adapter, 

the brain or controller’s position will be 

reversed

 on the rack (as well 

as being higher in relation to the rack), and letters on the lid will be 
upside down. Make sure that cables can still reach the connectors 
on the processor. 

No new features: 

The adapter does not change the capabilities of 

the rack. For example, four-channel digital modules still cannot be 
placed in module positions 8 and higher. In order to use newer 
features on the brain or controller, it must be on a SNAP PAC rack (or 
an M-series rack, such as the SNAP-M64).

Installing the Adapter

Before installing the rack adapter, read Opto 22 form #1688, the 

SNAP PAC System Migration Technical Note

, for important 

information on mixing legacy hardware with SNAP PAC system 
hardware and software. This form is available on our website, 

www.opto22.com. The easiest way to find it is to search on the form 
number. 

Requirements

Part number SNAP-RCK-M2B includes the following pieces:

Lock  washer

6-32 hex standoff

Replacement  baseplate

Adapter

You will also need a medium-sized Phillips screwdriver to install the 
adapter. 

Installation Steps

1. Remove all SNAP-RCK-M2B pieces from their packaging. 

2. Turn off power to the rack.

3. Disconnect Ethernet cables from the existing processor on the 

rack. Loosen the screw holding the processor on the rack and 
remove the processor. Set it aside.

4. Turn the new processor (brain or controller) upside down. 

Remove the four small screws holding the black baseplate on 
the processor, and remove the baseplate. Keep the screws. 

5. Hold the replacement baseplate so that its indentation is facing 

away from the brain (see the following photo). 

6. Align the brain’s hold-down screw with the center hole in the 

replacement baseplate. Using the same four screws, attach the 
replacement baseplate to the new processor.

7. On the rack, set the lock washer over the hole next to the pro-

cessor’s connector, and then screw the 6-32 hex standoff into 
the hole. Tighten the standoff just to the position where two of 

Install the adapter to use 

one of these processors...

...on one of these racks

SNAP-PAC-R1
SNAP-PAC-R2
SNAP-PAC-EB1
SNAP-PAC-EB2

SNAP-B4M
SNAP-B8M
SNAP-B8MC
SNAP-B8MC-P
SNAP-B12M
SNAP-B12MC
SNAP-B12MC-P
SNAP-B16M
SNAP-B16MC
SNAP-B16MC-P

NOTE: The adapter can also be used with a SNAP-UP1-M64 
or SNAP-ENET-S64 brain.

Indentation

Hold-down screw

Beveled screw hole 
(bevel faces out)

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