ABB TU552-CS31 CS31 Bus Terminal Unit
A 24 V DC CS31 interface terminal unit that keeps bus, supply and field wiring attached when compatible module electronics are serviced.
Product Profile
TU552-CS31 is ABB order code 1SAP210400R0001, the spring-terminal counterpart to TU551-CS31. It forms the fixed connection base for supported S500 CS31 communication interface modules.
Its thirty terminal positions carry the defined process-supply, bus and module-dependent signal assignments. Correct selection depends on the inserted interface module and the cabinet preference for spring-clamp wiring.
Technical Data
| Manufacturer | ABB |
|---|---|
| Model | TU552-CS31 |
| Order Code | 1SAP210400R0001 |
| Product Family | AC500 / S500 |
| Protocol | CS31 |
| Process Voltage | 24 V DC |
| Terminal Technology | Spring terminals |
| Terminal Positions | 30 |
| Bus Interface | R1, R2, B1, B2 and functional-earth positions |
| Process-Supply Points | UP and ZP |
| Applicable Electronics | Compatible 24 V DC CS31 communication interface modules |
| Lifecycle | Active |
System Role
- Provides the mechanical carrier and field connection point for the removable CS31 communication module.
- Maintains bus continuity and conductor organization independently of the plug-in electronics.
- Routes process supply to the inserted module through the fixed UP and ZP terminal groups.
- Supports downstream station expansion through the female local I/O-bus connector.
- Uses spring clamping to simplify repetitive panel assembly and conductor servicing.
Compatibility
- Use only with S500 CS31 communication interface modules specified for 24 V DC signals or interfaces.
- Do not treat TU552-CS31-XC as the same order code; the extreme-condition version is a separate article.
- Verify the host module terminal assignment because positions other than the fixed supply points are module dependent.
- Match the cabinet bus termination plan to the R1/R2 positions and preserve B1/B2 polarity.
- Confirm DIN-rail spacing and adjacent terminal-unit bus engagement before installation.
Applications
- CS31 distributed-I/O stations using spring-clamp field wiring.
- Replacement work where installed conductors must remain on the base during electronics service.
- Automation panels requiring a repeatable 24 V DC supply and functional-earth layout.
- Machine retrofits that retain ABB S500 CS31 communication infrastructure.
FAQ
How does TU552-CS31 differ from TU551-CS31?
TU552-CS31 uses spring terminals, while TU551-CS31 uses screw terminals.
Is the XC version included in this order code?
No. TU552-CS31-XC has a different part number for extreme-condition applications.
Does every terminal keep the same signal assignment?
No. The fixed supply positions are defined, but the other assignments depend on the inserted CS31 module.
Why are there two B1 and two B2 points?
They provide connection positions for routing the CS31 bus through the station while preserving polarity.
Can field wiring remain attached during module replacement?
Yes. The removable electronics connect through the fixed terminal unit.
What information should accompany an enquiry?
Provide the exact terminal-unit code, inserted CS31 module, terminal preference, bus position and cabinet voltage.
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