How to Select an Interface Relay for PLC Outputs
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
The Siemens LOGO! DM8 24R (6ED1055-1HB00-0BA2) is a LOGO! 8 expansion module adding 4 AC/DC/NPN digital inputs and 4 relay outputs rated 5 A, in a 2-module-wide DIN-rail housing. It mounts alongside a LOGO! 8 base unit to add I/O points when the base unit's onboard I/O is not enough for the application.
The DM8 24R's relay outputs switch up to 5 A per point and handle lamp loads to 1000 W, unlike a transistor-output expansion module that switches faster but at lower current - pick this relay variant when driving contactor coils, indicator lamps, or small loads directly from the LOGO! output without an interposing relay. Digital inputs accept AC or DC signals, which simplifies wiring when field sensors on the same panel mix voltage types.
I/O expansion for relay and lamp control panels, HVAC and lighting control, and simple machine interlocks where LOGO! 8's onboard I/O count falls short. The 2-module width keeps the DIN-rail footprint compact when several expansion modules are stacked next to the base unit.
| Mounting | on 35 mm DIN rail, 2 spacing units wide |
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| Rated value (DC): 24 V DC | Yes |
|---|---|
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
| Rated value (AC): 24 V AC | Yes |
| Line frequency: permissible range, lower limit | 47 Hz |
| Line frequency: permissible range, upper limit | 63 Hz |
| Number of digital inputs | 4 |
|---|---|
| Input voltage: Type of input voltage | AC/DC |
| Input voltage: for signal "0" | < 5 V AC/DC |
| Input voltage: for signal "1" | > 12 V AC/DC |
| Input current: for signal "0", max. (permissible quiescent current) | 1.1 mA |
| Input current: for signal "1", typ. | 2.63 mA |
| Input delay (for rated value of input voltage) for standard inputs: at "0" to "1", max. | 1.5 ms |
| Part number | 6ED1055-1HB00-0BA2 |
|---|---|
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Active, in production |
| EAN | 4034106029449 |
| ETIM class | EC001419 |
| eCl@ss | 27242204 |
| Number of digital outputs | 4; Relays |
|---|---|
| Short-circuit protection | No |
| Controlling a digital input | Yes |
| Switching capacity of the outputs: on lamp load, max. | 1 000 W |
| Output current: for signal "1" rated value | 5 A |
| Output current: for signal "1" minimum load current | 100 mA |
| Parallel switching of two outputs: for uprating | No |
| Switching frequency: with resistive load, max. | 2 Hz |
| Switching frequency: with inductive load, max. | 0.5 Hz |
| Switching frequency: mechanical, max. | 10 Hz |
| Relay outputs Switching capacity of contacts: with inductive load, max. | 3 A |
| Relay outputs Switching capacity of contacts: with resistive load, max. | 5 A |
| Emission of radio interference acc. to EN 55 011: Limit class B, for use in residential areas | Yes |
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| IP degree of protection | IP20 |
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| CE mark | Yes |
|---|---|
| CSA approval | Yes |
| UL approval | Yes |
| FM approval | Yes |
| developed in accordance with IEC 61131 | Yes |
| according to VDE 0631 | Yes |
| Marine approval | Yes |
| Ecological footprint: environmental product declaration Global warming potential | Yes |
| Ecological footprint: global warming potential, (total) [CO2 eq] | 59.1 kg |
| Ecological footprint: global warming potential, (during production) [CO2 eq] | 5.82 kg |
| Ecological footprint: global warming potential, (during operation) [CO2 eq] | 53.6 kg |
| Ecological footprint: global warming potential, (after end of life cycle) [CO2 eq] | -0.373 kg |
| Ambient temperature during operation: min. | -20 °C; No condensation |
|---|---|
| Ambient temperature during operation: max. | 55 °C |
| Width | 35.5 mm |
|---|---|
| Height | 90 mm |
| Depth | 58 mm |
| Net weight | 0.166 kg |
|---|---|
| Country of origin | CN |
| Shipping weight | 0.666 kg |
| Ships from | Türkiye |
| Dispatch | 13 Nov |
| Stock | In stock |
Source: manufacturer data · Last verified: 01 Nov 2026
No documents are on file for this part yet.
Ask us for the datasheetThe rated current of 6ED1055-1HB00-0BA2 is 5 A.
The rated operational voltage of 6ED1055-1HB00-0BA2 is 24–DC V DC.
The tariff (HS) code on file for 6ED1055-1HB00-0BA2 is 85389091.
The EAN (GTIN) of 6ED1055-1HB00-0BA2 is 4034106029449.
6ED1055-1HB00-0BA2 ships from Türkiye. Shipping calculated at checkout · import duties and taxes paid on arrival. Stock items are dispatched within 1–2 business days.
A step-by-step guide to matching PLC output type, coil voltage and current, contact rating, and socket style when selecting an interface relay.
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