ABB TU551-CS31 | CS31 Bus Terminal Unit for AC500 PLC, Screw Terminals
ABB TU551-CS31 terminal unit for CS31 I/O modules. 24V DC powered, DIN rail mount, screw terminals, IP20. ABB AC500 PLC system base module.
Product Overview
The ABB TU551-CS31 is a CS31 bus terminal unit (base module) designed for the ABB AC500 PLC system. It serves as the mechanical and electrical base for mounting S500 series CS31 communication interface modules and I/O modules. Featuring screw terminals for reliable wiring, it distributes the 24V DC process supply and signals, allowing for easy module replacement without disturbing the field wiring.
Technical Specifications (Electrical & Functional)
| Parameter | Specification |
| Manufacturer / Series | ABB / AC500 (TU551 Series) |
| Model | TU551-CS31 |
| Article Number | 1SAP210600R0001 |
| Product Type | CS31 Bus Terminal Unit (Base Module) |
| Supply Voltage (Up) | 24 V DC (18 – 30 V DC range) |
| Terminal Type | Screw Terminals |
| Bus Interface | CS31 I/O Bus (for S500 modules) |
| Internal Circuit Supply | Via Up/ZP terminals |
| Degree of Protection | IP20 |
Technical Specifications (Mechanical & Environmental)
| Parameter | Specification |
| Mounting | DIN Rail (TS-35/7.5 or 15) |
| Dimensions (WxHxD) | ~ 11 x 100 x 60 mm (approx.) |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | -40 °C to +70 °C |
| Ambient Conditions | For control cabinet use (IP20) |
| Compatible Modules | S500 CS31 Communication & I/O Modules |
Key Features
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Hot-Swap Capable: CS31 modules can be inserted/removed without disconnecting field wires.
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Integrated Power Distribution: Terminals 1.8–4.8 (Up) and 1.9–4.9 (ZP) provide continuous 24V DC to modules.
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System Integration: Part of the scalable ABB AC500 PLC architecture.
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Secure Connection: Modules lock mechanically into the terminal unit.
Applications
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Factory automation control cabinets
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Distributed I/O expansion for AC500 PLCs
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Machine control systems requiring modular I/O
About ACH
Founded in 2012, ACH is a top-tier distributor of industrial automation products, supplying genuine devices from leading brands like ABB, P+F, E&H, AB, MTL to emerging markets worldwide. Our mission is to provide 100% Genuine products at the most competitive prices, helping customers reduce costs and strengthen their market position.
Frequently Ask & Questions
Are preferential prices available?
Long-term brand partners can get competitive product prices. At the same time, ACH controls the profit per order to 5%, providing the most competitive prices.
Are the Products Genuine OEM Units?
Yes, all products from ACH are certified genuine OEM units. We acquire our inventory through official OEM channels and trusted third-party suppliers, ensuring every item is authentic and reliable.
How will you arrange shipment?
We'll handle the shipping for you. Through our partnerships, we can secure competitive rates with major carriers like FedEx, DHL, TNT, and UPS, ensuring a smooth and cost-effective delivery.
What is the warranty of goods?
One-year Warranty.
How long is the logistics cycle of the product?
Products are divided into spot and futures, and the delivery period of different brands of products is also different. For details, please contact the ACH business manager.
