ABB DO571 8-Channel Relay Digital Output Module
An eight-channel normally-open relay output module with two isolated groups and switching support for 24 V DC, 24 V AC and 120/240 V AC loads.
Product Overview
ABB DO571, article 1TNE968902R2202, provides eight normally-open relay outputs divided into two isolated groups of four. The relay contacts accommodate low-voltage DC or AC signals as well as 120/240 V AC loads within the documented current and switching limits.
Performance
- Eight normally-open relay outputs are arranged as two groups of four.
- Each channel supports up to 2 A for the documented resistive voltage classes.
- Typical relay switching delay is 10 ms in both directions.
- Maximum group current is 8 A.
- ABB specifies 100,000 relay-contact cycles at rated load.
Technical Details
| Manufacturer | ABB |
|---|---|
| Article Number | 1TNE968902R2202 |
| Product Family | AC500 S500-eCo |
| Output Count | 8 normally-open relay outputs |
| Output Grouping | 2 isolated groups of 4 channels |
| Rated Voltage Classes | 24 V DC, 24 V AC, 120 V AC or 240 V AC |
| Maximum Resistive Current per Channel | 2 A |
| Maximum Pilot-Duty Current at 240 V AC | 1.5 A |
| Maximum Current per Group | 8 A |
| Typical Switching Delay | 10 ms |
| Output Data Length | 1 byte |
| Maximum Lamp Load | 200 W at 230 V AC; 30 W at 24 V DC |
| Protection | External fusing required |
| Terminal Block | One 11-pin block, ordered separately |
| Maximum Module Dissipation | 2 W |
| Lifecycle | Active |
System Integration
- Fit one compatible 11-pin S500-eCo terminal block selected for screw or spring connection.
- Supply the relay coils from 24 V DC at terminal 20 as described by ABB.
- Provide external contact protection and load suppression; relay outputs are not internally short-circuit protected.
- Separate low-voltage and mains-voltage wiring according to the applicable installation requirements.
- Hot swap is not supported for DO571; remove all hazardous voltage before service.
Applications
- Relay isolation for mixed low-voltage and mains-voltage control circuits.
- Contactor, pilot and signaling loads within the documented contact ratings.
- Compact S500-eCo stations requiring two isolated groups of four outputs.
- Maintenance replacement where normally-open relay behavior must be retained.
- Active spare planning for ABB article 1TNE968902R2202.
FAQ
What contact type does DO571 provide?
The module provides eight non-latching normally-open relay outputs.
How are the relay outputs grouped?
They are divided into two galvanically isolated groups of four channels.
What is the maximum channel current?
The resistive-load rating is up to 2 A, with a lower 1.5 A limit for 240 V AC pilot duty.
How fast do the relays switch?
Typical delay is 10 ms for both opening and closing transitions.
Does DO571 need external fuses?
Yes. The contacts are not short-circuit or overload protected, so external protection is required.
Which terminal block is used?
DO571 uses one 11-pin S500-eCo terminal block, ordered separately.
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