A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.

Relays can be used to create additional isolation between electrical circuits of Evocon devices and manufacturing equipment.

The traditional form of a relay uses an electromagnet to close or open the contacts, but other operating principles have been invented, such as in solid-state relays which use semiconductor properties for control without relying on moving parts. As the signals counted by Evocon devices can be fast and plentiful, we suggest using solid-state relays instead of electromagnetic relays.

Relays are also required if signals with different voltage levels from Evocon device input (24V DC) are used for signals.

Example of a solid-state relay with A1 & A2 as input terminals and 13 & 14 as contact terminals. https://www.phoenixcontact.com/online/portal/us?uri=pxc-oc-itemdetail:pid=2905294

<aside> 📘 How many signals can be connected to the Evocon device using this relay?

For this particular solid state relay the “connection time” is 20µs or 0.02ms. And “release time” is 300µs or 0.3ms.

Evocon device can detect signals that are at least 1ms long.

It means that as 1 minute = 60 000ms and if we have 1ms ON, 1ms OFF pulse (2ms in total) then the Evocon device can detect 30 000 signals per minute.

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<aside> 💡 When using solid-state relays, make sure to connect +24V from Evocon device to the "+" or "COM" contact terminal. The polarity is not important for electromechanical relays if only COM and NO contacts are used.

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Below is a wiring diagram for connecting a relay to Evocon device.

All Evocon device inputs are 24V DC inputs. And the M12 connectors use standard wiring pinout. PNP-type 24VDC industrial sensors that can be connected to Evocon device.

<aside> ⚡ When using mechanical relays, the signal is not as stable as with solid state relays. In this case, ON and OFF filters are likely needed to be set up. You can learn more about this from this article.

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