Description
Product Overview
The Emerson 396657-01-0 is a Power Supply/Sequencer Module (PSSM) for the ControlWave Micro remote automation platform. Despite some online listings identifying this part as a CPU module, Emerson documentation identifies 396657-01-0 specifically as a PSSM.
The module installs in Slot #1 of the ControlWave Micro backplane and provides the power supply and sequencing functions required by the system. The 396657-01-0 version includes a Run/Remote/Local switch, display interface, and watchdog connection.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Emerson / Bristol |
| Model | 396657-01-0 |
| Platform | ControlWave Micro |
| Module Type | Power Supply/Sequencer Module (PSSM) |
| Installation Position | Slot #1 |
| Front Interface | Run / Remote / Local switch |
| Display Interface | Integrated |
| Watchdog | Watchdog connector / monitoring function |
| Backplane Connection | P1, 44-pin female header |
| Application | ControlWave Micro RTU / remote automation system |
| Condition of Referenced Listing | New – Open Box |
Emerson’s instruction manual identifies 396657-01-0 as the PSSM configuration with the Run/Remote/Local switch and display interface, with Revision A and later versions documented.
Main Functions
The PSSM is part of the ControlWave Micro system power and sequencing architecture. Its main functions include:
- System power supply interface
- Power sequencing for the ControlWave Micro system
- Run/Remote/Local operating-mode selection
- Display interface support
- Watchdog connection and system-status monitoring
- Backplane power and control interface
Two red front-panel LEDs are used for watchdog and idle status indication on the documented PSSM configuration.
ControlWave Micro System Position
The ControlWave Micro architecture separates the PSSM from the CPU.
Slot #1 — 396657-01-0 PSSM
Provides power-supply and sequencing functions.
Slot #2 — CPU Module
Contains the ControlWave Micro processor and communication hardware.
Emerson specifically warns that the CPU module should not be confused with the Expansion Communication Module (ECOM). The CPU is installed in Slot #2, while the PSSM occupies Slot #1.
Installation & Configuration
Before installation, verify the existing ControlWave Micro chassis and backplane configuration.
- Disconnect system power according to the applicable ControlWave Micro maintenance procedure.
- Confirm that the target position is Slot #1.
- Verify the module part number and revision.
- Inspect the backplane connector and module mating connector.
- Check the Run/Remote/Local switch and front-panel display interface.
- Verify the watchdog wiring where applicable.
- Install the module firmly into the backplane.
- Restore system power and check the front-panel status indicators.
- Confirm normal system operation before returning the RTU to service.
The module uses connector P1 on the ControlWave Micro backplane. Emerson specifies this as a 44-pin female non-keyed header connection.
Inspection & Maintenance
For a spare or replacement module, inspect the unit before installation:
- Part-number and revision label
- PCB and housing condition
- Backplane connector pins
- Front-panel switch
- Display interface
- Watchdog connector
- Signs of corrosion or contamination
- Mechanical damage around mounting points
For a used or open-box unit, a practical test should include power-up verification, front-panel status indication, Run/Remote/Local switch operation, and watchdog-related checks where the test setup supports them.
Compatibility Notes
The most important identification point is the part number.
396657-01-0 = ControlWave Micro PSSM
It is not the ControlWave Micro CPU.
Emerson also documents 396657-02-8 as another PSSM configuration, using a Mode Switch and Display Interface without the watchdog output. These configurations should not be assumed to be interchangeable without checking the system hardware and required functions.
For CPU replacement, identify the separate CPU module part number installed in Slot #2.
Condition
The referenced eBay listing is currently described as New – Open Box and identifies the item as Emerson 396657-01-0.
Before shipment, verify the physical nameplate, revision, connectors, and included accessories against the buyer’s existing ControlWave Micro installation.
Ordering Information
Please provide the complete part number when requesting a quotation:
396657-01-0
For replacement applications, it is also useful to confirm:
- ControlWave Micro chassis type
- Existing CPU model
- PSSM revision
- Required display/interface configuration
- Watchdog requirement
- Current module photographs or nameplate information
This helps avoid confusing the PSSM with the separate ControlWave Micro CPU module.
Recommended eBay Title
EMERSON 396657-01-0 | ControlWave Micro PSSM Power Supply/Sequencer Module
