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.
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The Siemens 6BK1622-0AA00-0AA0 is a SIMATIC PN/M-Bus LINK coupling module that bridges a PROFINET network to an M-Bus field bus, acting as M-Bus master for up to 40 connected meters. It runs on 24 V DC (20.4-28.8 V), has two RJ45 PROFINET ports with an integrated switch, and carries IP20 protection.
The 40-device M-Bus master capacity and 300 m max cable length size this LINK module for a full sub-metering branch rather than a handful of meters, so count connected M-Bus devices against that 40-unit ceiling before adding more. Two RJ45 ports with an integrated switch let it sit in a PROFINET line topology without a separate switch upstream. It is rated to -25°C on the low end, so verify the installation location's minimum temperature against that limit in unheated cabinets.
Bridges PROFINET-based automation and building-management systems to M-Bus energy and utility meters for centralized remote metering and consumption monitoring.
| Product type designation | PN/M-Bus LINK |
|---|---|
| Firmware version | V1.0.0 |
| FW update possible | Yes |
| Product function: I&M data | Yes |
| Product function: Isochronous mode | No |
| Engineering with: STEP 7 TIA Portal configurable/integrated from version | STEP 7 V15 or higher |
| Engineering with: PROFINET from GSD version/GSD revision | GSDML V2.3.x |
| Mounting | DIN rail, wall mounting, portrait mounting |
|---|---|
| Mounting position | any |
| Recommended mounting position | Horizontal |
| Rail mounting | Yes |
| Control cabinet installation | Yes |
| Type of supply voltage | DC |
|---|---|
| Rated value (DC) | 24 V |
| permissible range, lower limit (DC) | 20.4 V |
| permissible range, upper limit (DC) | 28.8 V |
| Reverse polarity protection | Yes |
| Overvoltage protection | Yes |
| Short-circuit protection | Yes |
| Mains buffering: Mains/voltage failure stored energy time | 10 ms; PN side |
| Part number | 6BK1622-0AA00-0AA0 |
|---|---|
| Type designation | PN/M-Bus LINK |
| Brand | Siemens |
| Condition | New, factory sealed |
| Source | Siemens and its authorised distributors |
| Warranty | Manufacturer warranty |
| Lifecycle status | Phase-out announced by the manufacturer |
| EAN | 4025515739623 |
| ETIM class | EC001423 |
| eCl@ss | 27242208 |
| Current consumption (rated value) | 0.11 A; At 24 V and 5 loads |
|---|---|
| Current consumption, max. | 0.4 A; At 20.4 V, 40 loads + 100 mA short-circuit current |
| Power loss, typ. | 2.4 W |
|---|
| Supports protocol for PROFINET IO: automatic detection of transmission rate | No |
|---|---|
| Supports protocol for PROFINET IO: Transmission rate, max. | 100 Mbit/s |
| Supports protocol for PROFINET IO: Number of RJ45 ports | 2 |
| Supports protocol for PROFINET IO: Number of FC (FastConnect) connections | 2 |
| PROFINET functions: Assignment of the IP address, supported | Yes |
| PROFINET functions: Assignment of the device name, supported | Yes |
| Interface type | M-Bus master |
|---|---|
| Isolated | No |
| Interface types: Number of ports | 1 |
| Interface types: Design of the connection | 3-wire screw-type terminal |
| M-Bus: Bus voltage, typ. | 36 V |
| M-Bus: Transmission rate, min. | 300 bit/s |
| M-Bus: Transmission rate, max. | 9 600 bit/s |
| M-Bus: max. number of devices | 40 |
| M-Bus: Short-circuit detection | Yes |
| M-Bus: short-circuit proof | Yes |
| M-Bus: Connectable conductor cross-section | 1.5 mm2 |
| M-Bus: Cable length, max. | 300 m |
| Interface type | PROFINET |
|---|---|
| Isolated | Yes; 1 500 V AC or 2 250 V DC |
| Interface types: RJ 45 (Ethernet) | Yes |
| Interface types: Number of ports | 2 |
| Interface types: integrated switch | Yes |
| Protocols: PROFINET IO Device | Yes |
| Protocols: Open IE communication | Yes |
| Status indicator | Yes |
|---|---|
| Alarms | Yes |
| Diagnostics function | Yes |
| Diagnostics indication LED: RUN LED | Yes |
| Diagnostics indication LED: ERROR LED | Yes |
| Diagnostics indication LED: MAINT LED | Yes |
| Diagnostics indication LED: LINK LED | Yes |
| Diagnostics indication LED: RX/TX LED | Yes |
| Potential separation exists | Yes |
|---|
| IP degree of protection | IP20 |
|---|
| CE mark | Yes |
|---|---|
| RoHS conformity | Yes |
| Ecological footprint: environmental product declaration Global warming potential | Yes |
| Ecological footprint: global warming potential, (total) [CO2 eq] | 50.8 kg |
| Ecological footprint: global warming potential, (during production) [CO2 eq] | 14.4 kg |
| Ecological footprint: global warming potential, (during operation) [CO2 eq] | 36.8 kg |
| Ecological footprint: global warming potential, (after end of life cycle) [CO2 eq] | -0.52 kg |
| Ambient temperature during operation: horizontal installation, min. | -25 °C |
|---|---|
| Ambient temperature during operation: vertical installation, min. | -25 °C |
| Ambient temperature during operation: ceiling installation, min. | -25 °C |
| Ambient temperature during operation: ceiling installation, max. | 45 °C |
| Ambient temperature during operation: floor installation, min. | -25 °C |
| Ambient temperature during operation: floor installation, max. | 45 °C |
| Ambient temperature during storage/transportation: min. | -40 °C |
| Ambient temperature during storage/transportation: max. | 70 °C |
| Relative humidity: Operation, max. | 95 % |
| Width | 70 mm |
|---|---|
| Height | 112 mm |
| Depth | 75 mm |
| Weight, approx. | 215 g |
|---|
| Net weight | 0.273 kg |
|---|---|
| Country of origin | DE |
| Shipping weight | 0.773 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 PN/M-Bus LINK is 0.11 A.
The rated operational voltage of PN/M-Bus LINK is 24 V AC.
The tariff (HS) code on file for PN/M-Bus LINK is 85176200.
The EAN (GTIN) of PN/M-Bus LINK is 4025515739623.
PN/M-Bus LINK 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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