3.0_SCADA_Background_Existing_Systems.pdf

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Wastewater SCADA System HMI Replacement
Solicitation number
2026-RFP-006
Issued by
Greenville County, South Carolina

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SCADA Background and Existing Systems Documentation

This document is a technical background file detailing the existing SCADA infrastructure for the Greenwood Metropolitan District (GMD) wastewater treatment facilities in South Carolina. The file provides comprehensive specifications for two wastewater treatment facilities—Wilson Creek WWTF and West Alexander WWTF—that require modernization of their supervisory control and data acquisition (SCADA) systems. Wilson Creek WWTF currently operates 16 programmable logic controllers (PLCs) with approximately 3,700 tags utilizing Wonderware SCADA software and Win911 alarm systems on standalone Windows servers with Dell hardware. West Alexander WWTF operates 5 PLCs with approximately 1,000 tags under similar legacy configurations. Both facilities use Rockwell Automation/Allen-Bradley equipment interconnected via fiber and copper with Hirschmann switches on dedicated SCADA fiber loops. The project requires conversion from local workstation-based HMI configurations to modern client/server architectures, replacement of physical servers and workstations by the SCADA integrator, migration from Wonderware to an equivalent or superior modern SCADA software solution, and configuration of new workstations as SCADA clients with access controls. The detailed technical specifications enumerate all 16 control system locations at Wilson Creek and 5 locations at West Alexander, including specific PLC models (ranging from legacy SLC 5/05 and MicroLogix 1400 units to newer ControlLogix and CompactLogix platforms), module configurations with quantities of analog inputs/outputs, AC/DC inputs/outputs, and relay outputs for each location.

The document establishes that new Windows servers and workstations will be provided by the SCADA integrator following GMD staff approval of brand and specifications, with PLC programs to be downloaded from existing equipment and configured into the new system architecture. Both facilities currently employ physical alarm dialers with analog dial-out capabilities through Win911 that must be replaced with integrated modern alarm management functionality. The file confirms fiber connectivity exists between Wilson Creek WWTF, West Alexander WWTF, and the GMD main office, facilitating system integration. The solicitation deadline for sealed proposals is 4:00 PM on Wednesday, September 23, 2026, submitted via the District's eProcurement Portal at https://procurement.opengov.com/portal/gmdsc. Supporting documentation including equipment photos and existing HMI screen configurations for both facilities will be provided by GMD IT Manager Jeff Auman to prospective bidders. The document emphasizes that replacement SCADA software must maintain equivalent or enhanced functionality compared to all existing services currently provided by the legacy WonderWare systems.

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CONFIDENTIAL

This document contains sensitive information regarding public utility infrastructure. Unauthorized distribution, copying or dissemination is strictly prohibited without written permission from authorized GMD personnel.

3.1. Background on Existing System

Existing SCADA Systems: Wonderware with Rockwell Automation/Allen-Bradley PLC’s

Existing Alarming systems: Win911

Existing Servers: Windows standalone servers on Dell hardware

3.2. Wilson Creek Wastewater Treatment Facility (WWTF)

The existing control system contains 16 PLCs with one HMI that are interconnected with fiber and/or copper and utilizes a physical alarm dialer using Win911 with analog dial-out lines. The HMI WonderWare software is currently running locally on a single workstation. Current tag count is approximately 3,700. The desire is to convert this to a client/server configuration. Most of the Programmable Logic Controllers (PLC) and touch screen HMIs in the facility are Rockwell Automation/Allen-Bradley.

A new Windows server and workstation will be provided by SCADA Integrator after approval of brand and specifications by GMD staff. Workstation needs to be configured as a SCADA client to the WWTF Server utilizing access controls to access the WWTF screens. PLC programs will need to be downloaded from existing PLCs.

The WonderWare server software is hosted locally on a server in the plant main building computer room. The physical workstations and physical server will be replaced by SCADA Contractor as needed. Replacement SCADA software needs to be installed and configured by integrator/vendor and must be equivalent or improve all existing services used by WWTF. This will require updates and/or migrations from WonderWare to the chosen modern SCADA software solution. There is fiber connectivity between buildings on the Wilson Creek WWTF facility, the West Alexander WWTF plant and the GMD main office.

3.3. Wilson Creek WWTF Buildings and Enclosures

Control Room Building (Computer Room) - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

• PLC is Allen Bradley ControlLogix 5571

Modules:

• CPU Logix5571

• Ethernet/IP

• Analog Input (qty 2)

• Analog Output

• AC Output (qty 2)

• Relay Output (qty 2)

BNR Oxidation Ditch 1 - Connected via fiber to Hirschmann RS20 and BRS20 switches on the dedicated SCADA fiber loop.

• PLC is Allen Bradley ControlLogix 5561

Modules:

• CPU 5561

• Ethernet/IP

• Analog Input (qty 2)

• Analog Output

• AC Input (qty 2)

BNR Oxidation Ditch 2 - Connected via Hirschmann RS20 switch Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

• PLC is Allen Bradley ControlLogix 5571

Modules:

• CPU 5571

• Ethernet/IP

• Analog Input (qty 2)

• Analog Output

Influent Pump Station PLC-1 (PLC128)

• PLC is Allen Bradley ControlLogix 5561 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU 5561

• Ethernet/IP

• Analog Input (qty 5)

• Analog Output

• AC Input (qty 4)

Influent Pump Station PLC-1 Extension rack (PLC129)

• Ethernet/IP

• AC Output (qty 2)

RAS/WAS Pump Station

• PLC is Allen Bradley ControlLogix 5561 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU 5561

• Ethernet/IP

• Analog Input (qty 9)

• Analog Output (qty 2)

RAS/WAS Pump Station Extension rack:

• Ethernet/IP

• AC Input (qty 8)

• AC Output (qty 4)

Screw Pumps and Utility Pumps LCP-B

• PLC is Allen Bradley ControlLogix 1756-L71 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU 1756-L71

• Ethernet/IP

• Analog Input (qty 2)

• Analog Output

• DC Input (qty 3)

• DC Output (qty 2)

Trojan UV System Shed panel FCP6100

• PLC is Allen Bradley CompactLogix 5380 - Connected via the dedicated SCADA fiber loop.

o This system includes a stand-alone alarm auto-dialer.

Modules:

• CPU 5069-L320ER

• Analog Input 5069-IF8

• DC Input 5069-IB16

• DC Output 5069-OB16

Sludge Holding Blower Building

• PLC is Allen Bradley MicroLogix 1400 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

• CPU 1400

Sludge Transfer Pump Station PLC-2A

• PLC is Allen Bradley SLC 5/05 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU SLC 5/05

• Analog Input

• Analog Output

• 115VAC Input

• TRIAC Output (qty 3)

Sludge Pumping Station LCP-A

• PLC is Allen Bradley PLC 5 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU PLC-5

• Analog In (qty 2)

• AC Input (qty 6)

• AC Output (qty 4)

• Fiber Card

Filter No. 1 Control Panel

• PLC is Allen Bradley ControlLogix 5561 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU 5561

• AC Input (qty 2)

• Relay Output

• Analog Input

• Analog Output

• Ethernet/IP

BFP Control Panel FCP-BFP-1A loop.

Modules:

• CPU SLC5/05

• AC Input (qty 5)

• Relay Output (qty 2)

• Analog input

• Analog Output (qty 2)

BFP Control Panel FCP-BFP-2A loop.

Modules:

• CPU SLC5/05

• AC Input (qty 5)

• Relay Output (qty 3)

BFP Control Panel FCP-BFP-3A loop.

Modules:

• CPU SLC5/05

• AC Input (qty 5)

• Relay Output (qty 3)

RDP ENVESSEL Pasteurization System Control Panel

• PLC #1 is Allen Bradley SLC 5/05 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU SLC5/05

• AC Input (qty 10)

• PLC #2 is Allen Bradley SLC 5/05 - Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• CPU SLC5/05

• Relay Output (qty 4)

• Analog Input (qty 2)

Lime Slurry Pasteurization System Control Panel

• PLC is Allen Bradley CompactLogix L33ER - Connected on the dedicated SCADA fiber loop.

Modules:

• DC Input (qty 3)

• DC Output (qty 2)

• Analog Input

3.4. West Alexander Wastewater Treatment Facility (WWTF)

The existing control system contains 5 PLCs with one HMI that are interconnected with fiber and/or copper and utilizes a physical alarm dialer using Win911 with analog dial-out lines. The HMI WonderWare software is currently running locally on a single workstation. Current tag count is approximately 1,000. The desire is to convert this to a client/server configuration. Most of the Programmable Logic Controllers (PLC) and touch screen HMIs in the facility are Rockwell Automation/Allen-Bradley.

A new Windows server and workstation will be provided by SCADA Integrator after approval of brand and specifications by GMD staff. Workstation needs to be configured as a SCADA client to the WWTF Server utilizing access controls to access the WWTF screens. PLC programs will need to be downloaded from existing PLCs.

The WonderWare server software is hosted locally on a server in the plant main building computer room. The physical workstations and physical server will be replaced by SCADA Contractor as needed. Replacement SCADA software needs to be installed and configured by integrator/vendor and must be equivalent or improve all existing services used by WWTF. This will require updates and/or migrations from WonderWare to the chosen modern SCADA software solution. There is fiber connectivity between buildings on the West Alexander WWTF property, the Wilson Creek facility and the GMD main office.

3.5. West Alexander WWTF Buildings and Enclosures

Control Room Building (Computer Room Control Panel) Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

• PLC is Allen Bradley CompactLogix 5380

Modules:

• CPU 5069-L330ER

• Analog Input 5069-IY4 (qty 4)

• Analog Output 5069-OF4

• Address Reserve 5069-ARM

• Field Potential 5069-FPD

• AC Input 5069-IA16 (qty 3)

• AC Output 5069-OA16

Electrical Building LCP-15 (Electric Control Panel) Connected via fiber to Hirschmann RS20 and BRS20 switches on the dedicated SCADA fiber loop.

• PLC is Allen Bradley CompactLogix 5380

• CPU 5069-L330ER

• Address Reserve 5069-Arm

• Analog Input 5069-IY4 (qty 2)

• Field Potential 5069-FPD

Chemical Building LCP-XX Connected via Hirschmann RS20 switch Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

• PLC is Allen Bradley CompactLogix 5380

Modules:

• CPU 5069-L330ER

• Address Reserve 5069-ARM

• Analog Input 5069-IY4 (qty 5)

• Analog Output 5069-OF4 (qty 4)

• Field Potential 5069-FPD

RAS Pump station Building PLC-128

• PLC is Allen Bradley SLC 5/05 Connected via Hirschmann RS20 switch on the dedicated SCADA fiber loop.

Modules:

• SLC 5/05 CPU

• Analog Input (qty 2)

• 115 VAC Input (qty 3)

• TRIAC Output

Trojan UV System Shed Panel FCP6100

• PLC is Allen Bradley CompactLogix 5380 Connected on the dedicated SCADA fiber loop, o This system includes a stand-alone alarm auto-dialer.

• CPU 5069-L320ER

• Analog Input 5069-IF8

• DC Input 5069-IB16

• DC Output 5069-OB16

The following supplemental documents will be provided by GMD IT Manager, Jeff Auman.

• Wilson Creek SCADA Equipment photos

• Wilson Creek SCADA HMI Screens

• West Alexander SCADA HMI Screens

• West Alexander SCADA Equipment photos

File details come from the government source that posted it. Updated .