IO-Link devices with high current consumption (>200mA)
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Each IO-Link master has a specific current it can provide on its device ports.
Depending on the used IO-Link device this may be problematic. There are some SICK IO-Link devices that need more current than some of the IO-Link master could deliver.
Examples of SICK devices:
- FlexChain Host (current consumption depended on number of slaves, maximum 850 mA)
- MLG-2 (depended on number of beams, maximum 510 mA)
- SIG100 (depended on connected sensors, maximum 500 mA)
Here is a collection of some common IO-Link masters and their maximum current per port.
| Vendor | Name | Maximum current consumption of IOL device (per port) | Maximum sum current consumption |
|---|---|---|---|
| SICK | SIG350 | (2A on Pin1, 2A each on Pin2 and Pin4) 2000 mA | 10 000 mA |
| SICK | SIG200 | 500 mA | 3000 mA |
| SICK | IOLG2 | 2000 mA | 8000 mA |
| SICK | IOLA2US (SiLink-Box) | (with plugged power supply) 200 mA | - |
| Balluff | BNI (all variants) | 2000 mA | 9000 mA |
| Beckhoff | EL6224 | 500 mA | 2000 mA |
| Beckhoff | EP6224 | 1400 mA | 4000 mA |
| Siemens | SM 1278 | 200mA | 800mA (4ports x 200mA) |
| Siemens | S7-1500, CM 8xIO-Link 6ES7547-1JF00-0AB0 | 1000 mA | 4000 mA |
| Siemens | CM 4xIO-Link ST (SIMATIC ET 200SP) 6ES7137-6BD00-0BA0 | 200 mA | 800mA (4ports x 200mA) |
| ifm | AC2635 | 500 mA | ? |
| B&R | X20DS438A | 400 mA | ? |
| Rockwell | 1734-4IOL | ? | 600 mA |
| Phönix | AXL E PN IOL8 DI4 | 200 mA | 1600 mA |
As you can observe in this list there are quite a few masters that are only able to provide the minimum specified current of 200 mA.
What to do?
The only thing you can do is using an external / additional power supply.
To do so I recommend the following accessories:
Power isolation cable
7027723 ZPI-P1 https://www.sick.com/de/de/p/pn7027723
BLP: 32,40€
T-plug
6011682 DSL-1204-T0M3 (4 Pin) https://www.sick.com/de/de/6011682
BLP: 37,50€
6042167 SBO-02S12-DFSx (5 Pin) https://www.sick.com/de/de/6042167
BLP: 58,50€
Installation / Wiring
Our recommendation is to use the power isolation cable in combination to one of the above 1:1 T-plugs like this:
We recommend to use the same power supply for powering the IO-Link master and for the external supply of the device. In this case (usage of the same power supply) it is ok to use the T-plug only.
If the usage of the same power supply is not possible make sure that the voltage levels of both are similar (+/- 1V) to avoid equalizing currents via Pin 4. Those could interfere with the communication on Pin 4.
Additionally use the power isolation cable to avoid equalizing currents between the power supplies.
IO-link devices, high current consumption, power isolation cable, io link master