Physical hardware for discontinued PLC platforms: Allen-Bradley PLC-5, SLC 500, Modicon 984, GE Series 90, Siemens S5, and more. Control relays, timing relays, operator devices. Hardware only. No programming. No configuration.
We supply the physical modules, processors, I/O cards, and rack hardware. We do not write programs, configure processors, modify ladder logic, perform factory acceptance testing, provide technical support, or integrate hardware into your system. If you need a replacement 1746-IB16 input module for a spare shelf, or a PLC-5/30 processor as an emergency spare, we can help with that. If you need someone to program it, configure the I/O, or commission the system, that is outside our scope.
This is not a limitation we apologize for. A buyer who knows exactly what hardware they need will not want to pay for programming services they don't need. Send us a catalog number and a quantity. We'll tell you what we can source and at what condition.
All items are sourced from surplus and secondary market channels. Condition disclosed with every quote. Catalog number is the most reliable identification method for any module request.
The PLC-5 family covers a wide range of processor memory and I/O capacity configurations, from the 5/10 and 5/11 at the smaller end through the 5/40, 5/60, and 5/80 for larger systems. The 1771 I/O rack system uses 1771 I/O modules in full-size and half-size configurations. Processors are identified by the 1785- prefix (e.g., 1785-L40). I/O modules use the 1771- prefix and a type designator (1771-IA for 120V AC input, 1771-OA for 120V AC output, etc.).
The SLC 500 family runs from the fixed-I/O SLC 5/01 and 5/02 up to the 5/03, 5/04, and 5/05 processors with communication options. The 1746 I/O module series covers discrete inputs and outputs (AC and DC), analog I/O, and specialty modules. Module catalog numbers use the 1746- prefix. Common modules include 1746-IA16 (16-point 120V AC input), 1746-OA16 (16-point 120V AC output), 1746-IB16 (16-point 24V DC input), and 1746-NI4 (4-channel analog input).
The Modicon 984 series was Modicon's flagship PLC platform prior to the introduction of the Quantum series. Processor models include the 984-120, 984-230, 984-385, and the larger 984-680 and 984-785. The 984 series uses a separate I/O chassis system with drop cables and remote I/O adapters. These processors are long discontinued and are sought primarily for facilities that need a shelf spare for an existing 984-based control system they cannot currently justify replacing.
GE's Series 90-30 is a modular mid-range PLC platform widely installed in utilities, water treatment, and general manufacturing. The Series 90-70 is a larger VME-based platform used in high-I/O or high-processing applications. Both use GE-specific I/O modules, CPU modules, and power supplies. CPU module catalog numbers (IC693CPU...) and I/O module numbers (IC693MDL... for discrete, IC693ALG... for analog) are the reliable way to identify replacement hardware needs.
The Siemens S5 predates the S7 platform and is still running in older chemical processing, pulp and paper, and heavy manufacturing installations. S5 models include the S5-95U (compact), S5-100U, S5-115U (mid-range), S5-135U, and S5-155U (large). S5 hardware uses STEP 5 programming software; Edmundson Industrial supplies the physical hardware only. CPU modules, I/O cards, and power supply units are sourced through surplus channels. Siemens ended S5 support years ago; hardware is secondary market only.
Texas Instruments produced the TI 505 and TI 545 PLC platforms primarily for process industry applications. These platforms were later transitioned through various ownership changes. Reliance Electric's AutoMax platform was used primarily in drive-coordinated applications such as winder and unwinder control systems. Both platforms are strictly secondary market; requests require the specific module catalog number. Sourcing is availability-dependent.
These are not obsolete. Control relays, timing relays, pushbuttons, and pilot lights remain standard industrial hardware. Listed here because they are commonly needed alongside PLC hardware for control panel builds, modifications, and replacements.
DPDT, 3PDT, and 4PDT configurations. Coil voltages: 12V DC, 24V DC, 120V AC, 240V AC. Ice cube relay bodies (11-pin octal, 8-pin octal) and blade-type relays. IDEC RH series is a standard specification relay used across control panels. Octal base sockets (surface mount and DIN rail) stocked separately from the relay bodies.
On-delay, off-delay, and interval timer configurations. IDEC, Omron, and Macromatic brands. Coil voltages: 120V AC, 24V DC most common. DIN rail mount and octal base mount configurations. Time range must be specified: a 0.1-60 second timer is a different part than a 1-60 minute timer even in the same series. Specify timing function, time range, and coil voltage.
2-position and 3-position configurations, maintained and momentary action. 30mm and 22mm operator sizes. Contact block configurations vary. Square D Class 9001 and Eaton 10250T are the two standard heavy-duty operator device lines. Specify operator size (30mm or 22mm), positions, action, and contact arrangement (NO, NC, or combined).
Momentary and maintained pushbutton operators. Flush, extended, and mushroom head styles. 30mm and 22mm operator sizes. Contact blocks are typically ordered separately from operator heads in the Square D 9001 and Eaton 10250T systems. Color coding follows standard convention: green for start, red for stop, black for general functions. Specify the catalog number for the operator head and contact block separately if known.
LED and incandescent pilot light units. 120V AC and 24V DC are the most common control voltages. 30mm and 22mm operator sizes. LED units have largely replaced incandescent in new installations due to lamp life, but incandescent units are still specified in many legacy panel replacement projects where panel uniformity matters. Specify voltage, operator size, and lens color.
These are the two principal heavy-duty industrial operator device lines. Square D Class 9001 covers pushbuttons, selector switches, pilot lights, and specialty operators in both 30mm and 22mm sizes. Eaton 10250T is the equivalent Eaton heavy-duty line. Both use a modular operator-plus-contact-block system. Panel builds often specify one series consistently to maintain spare parts standardization. We source both lines and their associated contact blocks and accessories.
For PLC hardware, the catalog number is the most direct identification path. A 1746-IB16 is a 1746-IB16. For control devices where the catalog number may not be readily at hand, provide the manufacturer, series, configuration, and coil voltage or rating.