Implementing 3-Switch XOR Ladder Logic with Internal Bit
Implement a 3-SPST switch XOR light circuit in LogixPro or RSLogix 500 using an internal relay bit. Includes truth tables, boolean equations, and verified.
The ABB PM856AK01 (Product ID: 3BSE066490R1) is a central processor unit kit designed for the AC 800M control system. Operating at 24MHz with 16MB of onboard memory, this processor unit serves as the central unit for process control and automation applications. The comprehensive package provides a complete assembly containing the CPU, baseplate, essential system bus terminators, and a dedicated battery for memory backup. It interfaces seamlessly with the ModuleBus and CEX-bus communication networks to manage peripheral components and expansion modules within industrial control environments.
| Product ID | ABB Type Designation | Catalog Description | Package Contents |
|---|---|---|---|
| 3BSE066490R1 | PM856AK01 | PM856AK01 Processor Unit | PM856A CPU, TP830 Baseplate, TB850 CEX-bus terminator, TB807 ModuleBus terminator, Battery (4943013-6), No license included |
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Product ID | 3BSE066490R1 |
| ABB Type Designation | PM856AK01 |
| Product Type | Central_Unit |
| Processor Speed | 24MHz |
| Memory Capacity | 16MB |
| Customs Tariff Number / HS Code | 85371091 / 853710 |
| Product Net Depth / Length | 155 mm |
| Product Net Height | 200 mm |
| Product Net Width | 130 mm |
| Product Net Weight | 1.1 kg |
| WEEE Category | 5. Small Equipment (No External Dimension More Than 50 cm) |
| Number of Batteries | 1 |
| Battery Chemical Composition | Lithium |
| Battery Type | Portable |
| Battery Weight | 9 g |
Global Express Shipping
Returns & Warranty



The ABB PM856AK01 (Product ID: 3BSE066490R1) is a central processor unit kit designed for the AC 800M control system. Operating at 24MHz with 16MB of onboard memory, this processor unit serves as the central unit for process control and automation applications. The comprehensive package provides a complete assembly containing the CPU, baseplate, essential system bus terminators, and a dedicated battery for memory backup. It interfaces seamlessly with the ModuleBus and CEX-bus communication networks to manage peripheral components and expansion modules within industrial control environments.
| Product ID | ABB Type Designation | Catalog Description | Package Contents |
|---|---|---|---|
| 3BSE066490R1 | PM856AK01 | PM856AK01 Processor Unit | PM856A CPU, TP830 Baseplate, TB850 CEX-bus terminator, TB807 ModuleBus terminator, Battery (4943013-6), No license included |
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Product ID | 3BSE066490R1 |
| ABB Type Designation | PM856AK01 |
| Product Type | Central_Unit |
| Processor Speed | 24MHz |
| Memory Capacity | 16MB |
| Customs Tariff Number / HS Code | 85371091 / 853710 |
| Product Net Depth / Length | 155 mm |
| Product Net Height | 200 mm |
| Product Net Width | 130 mm |
| Product Net Weight | 1.1 kg |
| WEEE Category | 5. Small Equipment (No External Dimension More Than 50 cm) |
| Number of Batteries | 1 |
| Battery Chemical Composition | Lithium |
| Battery Type | Portable |
| Battery Weight | 9 g |
Global Express Shipping
Returns & Warranty
Orders are processed and delivered Monday-Friday (excluding public holidays).
For full eligibility, restocking fees, and international return details, please view our official Refund & Return Policy .
| Country of origin |
Sweden
|