Solid-State and Electromechanical Relay Products
Relay is the name for a switch that is operated electro-mechanically or electronically. Their main task is to make and break connections to control the flow of current in electrical circuits. They’re used for various purposes ranging from validating semiconductors to interfacing low power computers or microcontrollers with high power machinery.
There are two main types of relays. Electromechanical Relays use an inductor to mechanically operate the arm of the switch while Solid State Relays (SSR) have no moving parts but instead use the electrical and optical properties of semiconductors to perform their switching functions. At ACCES I/O we use Field Effect Transistor (FET) switches for non-mechanical solutions as they have faster switching speeds and smaller form factors than traditional SSRs.
In order to choose the right relay for your application it is useful to first take note of the key differences between main types of relays.
In Electromechanical Relays (commonly just relays) the connection is controlled by an arm that opens and closes as a response to the magnetic field induced in the coil on the other side. The mechanical robustness of this connection allows it to operate in harsh conditions and to support a wide range of signals, but that’s also what makes this connection slower (5-15ms) and bulkier. Another important occurrence in Electromechanical Relays resulting from its construction is so called contact bounce that causes a noise after switching the relay position to closed but it can be efficiently cushioned by using a debouncing filter.
FETs (often called high side or low side switches) due to their non-mechanical nature offer zero contact bounce and are much faster (0.5-1ms) and smaller. The common problem with them is that they require a minimum load to work and they can switch only DC signals. They’re recommended whenever faster and more frequent switching is required and are a perfect solution for low noise applications like precise measurements.
For more information about different variants of FETs and Electromechanical Relays and guidance on how to choose the right relay for your application, click here.
| MODEL | DESCRIPTION | RoHS |
|---|---|---|
| PCIe-IDIO-24 | 48-channel I/O (24 isolated digital inputs, 24 isolated high-side FET switches) with COS (change of state) |  |
| PCIe-IIRO-16 | 32-channel I/O (16 isolated digital inputs, 16 electromechanical relay outputs) with COS (change of state) | |
| PCIe-IDIO-12 | 24-channel I/O (12 isolated digital inputs, 12 isolated high-side FET switches) with COS (change of state) | |
| PCIe-IIRO-8 | 16-channel I/O (8 isolated digital inputs, 8 electromechanical relay outputs) with COS (change of state) | |
| PCIe-IDI-24 | 24 isolated inputs (24 optically isolated digital inputs) with COS (change of state) | |
| PCIe-IDO-24 | 24 isolated outputs (24 isolated high-side FET switches) | |
| Products | # I/O | Buf | Prog | OPTOs | Relays | CTRS | COS | RoHS | |
|---|---|---|---|---|---|---|---|---|---|
| M2-II-16 Coming Soon! | 16 In | Yes | Yes | Yes | | ||||
| M2-II-8 Coming Soon! | 8 In | Yes | Yes | Yes | | ||||
| M2-II-4 Coming Soon! | 4 In | Yes | Yes | Yes | | ||||
| M2-IDIO-8 Coming Soon! | 8 In/8 Out | Yes | Yes | 8SS* | Yes | | |||
| M2-IDO-8 Coming Soon! | 8 Out | Yes | 8SS* | | |||||
| M2-IDIO-4 Coming Soon! | 4 In/4 Out | Yes | Yes | 4SS* | Yes | | |||
| M2-IIRO-8 Coming Soon! | 8 In/8 Out | Yes | Yes | 8 | Yes | | |||
| M2-RO-8 Coming Soon! | 8 Out | Yes | 8 | | |||||
| M2-IIRO-4 Coming Soon! | 4 In/4 Out | Yes | Yes | 4 | Yes | | |||
| Buf = Buffered I/O Prog = Programmable I/O OPTOs = Optically Isolated * Solid State CTRS = Counters/Timers COS = Change Of State Detection = Optionally available RoHS Ready | |||||||||
| Products | # I/O | Buf | Prog | OPTOs | Relays | CTRS | COS | RoHS | |
|---|---|---|---|---|---|---|---|---|---|
| mPCIe-II-16 | 16 In | Yes | Yes | Yes | | ||||
| mPCIe-II-8 | 8 In | Yes | Yes | Yes | | ||||
| mPCIe-II-4 | 4 In | Yes | Yes | Yes | | ||||
| mPCIe-IDIO-8 | 8 In/8 Out | Yes | Yes | 8SS* | Yes | | |||
| mPCIe-IDO-8 | 8 Out | Yes | 8SS* | | |||||
| mPCIe-IDIO-4 | 4 In/4 Out | Yes | Yes | 4SS* | Yes | | |||
| mPCIe-IIRO-8 | 8 In/8 Out | Yes | Yes | 8 | Yes | | |||
| mPCIe-RO-8 | 8 Out | Yes | 8 | | |||||
| mPCIe-IIRO-4 | 4 In/4 Out | Yes | Yes | 4 | Yes | | |||
| Buf = Buffered I/O Prog = Programmable I/O OPTOs = Optically Isolated * Solid State CTRS = Counters/Timers COS = Change Of State Detection = Optionally available RoHS Ready | |||||||||
| MODEL | DESCRIPTION | RoHS |
|---|---|---|
| USB-IDIO-16 | USB to 16 optically isolated digital inputs (AC or DC) and 16 isolated solid-state relay outputs | |
| USB-IDO-16 | USB to 16 isolated solid-state relay outputs only | |
| USB-IDIO-8 | USB to 8 optically isolated digital inputs (AC or DC) and 8 isolated solid-state relay outputs | |
| USB-IDIO-16L | USB to 16 optically isolated digital inputs (AC or DC) and 16 isolated low-side solid-state relay outputs | |
| USB-IDO-16L | USB to 16 isolated low-side solid-state relay outputs | |
| USB-IDIO-8L | USB to 8 optically isolated digital inputs (AC or DC) and 8 isolated low-side solid-state relay outputs | |
| USB-IIRO-4 | USB to 4 optically isolated digital inputs (AC or DC) and 4 electronmechanical relay outputs | |
| USB-IIRO4-2SM | Small USB-based unit provides 4 optically isolated inputs and 4 electromechanical relay outputs, as well as 2 RS-232/422/485 Serial Ports | |
| USB-IIRO4-DB | USB to 4 optically isolated digital inputs (AC or DC) and 4 electromechanical relay outputs with external DB25 connector | |
| USB-IIRO-8 | USB to 8 optically isolated digital inputs (AC or DC) and 8 electromechanical relay outputs | |
| USB-RO-16 | USB to 16 electromechanical relay outputs | |
| USB-IIRO-16 | USB to 16 optically isolated inputs (AC or DC) and 16 electromechanical relay outputs in a small, rugged steel enclosure | |
| USBP-DAQ-2AI-1EM In Development! | Standalone or USB logging module with 2 16-bit analog inputs (you pick the input ranges!) and 1 electromechanical relay output. Log data for hours or months, with configurable alarm thresholds. | |
| USB-DIO48DO24 | 48 Channel USB Digital Input/Output Module with 24 Solid State FET Relay Outputs | |
| USB-DIO24DO12 | 24 Channel USB Digital Input/Output Module with 12 Solid State FET Relay Outputs | |
| USB-DO24 | 24 Solid State FET Relay Output Module on USB | |
| MODEL | DESCRIPTION | RoHS |
|---|---|---|
| 104-IIRO-8 | 24-channel (8 isolated digital inputs, 8 TTL inputs, 8 relay outputs) with change of state detection | |
| 104-IIRO-8E | 24-channel (8 isolated digital inputs, 8 TTL inputs, 8 relay outputs) without change of state detection | |
| 104-IIRO-16 | 32-channel (16 isolated digital inputs, 16 relay outputs) with change of state detection | |
| 104-IIRO-16E | 32-channel (16 isolated digital inputs, 16 relay outputs) without change of state detection | |
| 104-II32-4RO | 32 isolated digital inputs and 4 relay outputs with change of state detection | |
| 104-RO-16 | 16 relay outputs only version | |
| 104-IDIO-16 | 32-channel (16 isolated digital inputs, 16 solid state outputs) with change of state detection | |
| 104-IDIO-16E | 32-channel (16 isolated digital inputs, 16 solid state outputs) without change of state detection | |
| 104-IDIO-8 | 16-channel (8 isolated digital inputs, 8 solid state outputs) with change of state detection | |
| 104-IDIO-8E | 16-channel (8 isolated digital inputs, 8 solid state outputs) without change of state detection | |
| 104-IDO-16 | 16 isolated digital outputs only version | |
| 104-IDO-8 | 8 isolated digital outputs only version |
| MODEL | DESCRIPTION | RoHS |
|---|---|---|
| PCI-IIRO-8 | Eight isolated digital inputs and eight relay outputs card | |
| LPCI-IIRO-8 | Low profile, eight isolated digital inputs and eight relay outputs card | |
| PCI-IIRO-16 | Sixteen isolated digital inputs and sixteen relay outputs card | |
| PCI-IDIO-16 | Sixteen isolated digital inputs and sixteen FET outputs card | |
| PCI-IDO-16A | 16-channel individually optically isolated solid state digital outputs | |
| PCI-IDO-32A | 32-channel individually optically isolated solid state digital outputs | |
| PCI-IDO-48A | 48-channel individually optically isolated solid state digital outputs | |
| PCI-IDO-16 | 16-channel individually optically isolated solid state digital outputs | |
| PCI-IDO-32 | 32-channel individually optically isolated solid state digital outputs | |
| PCI-IDO-48 | 48-channel individually optically isolated solid state digital outputs |
| MODEL | DESCRIPTION |
|---|---|
| WM-IIRO-8 | 8-Channel optically isolated input / electromechanical relayt output module. |
| WWP-IIRO-8 | A unique automated solution to wirelessly transmit the state of 8 isolated inputs up to 7 miles to 8 corresponding relay outputs -- bidirectionally, with no computer involved! |
| MODEL | DESCRIPTION | RoHS |
|---|---|---|
| ROB-8A | 8-Port Electromechanical Relay Card | |
| ROB-24 | 24-Port Electromechanical Relay Card | |
| ROB-24H | 24-Port Electromechanical Relay Card, High Current Rating (For add-on options, see ROB-24) | |
| A16A | Solid-state I/O Modules and Cards | |
| A24A | Solid-state I/O Modules and Cards |