Relays and Optocoupler

These cards are developed to control and record external circuits. By using optocouplers the controlling system is always protected by galvanic isolation.
Optocouplers switch external circuits galvanically isolated or can record switching activities of external circuits. Relays switch external circuits mechanically.

 
PCI  
 
    Relay Opto-Input Opto-Output
Bus Numbers Type Capacity / Power Number of Opto-In Voltage Number of Opto-Out Voltage
                 
PCIOPTOREL16PCI 16 switch-on 1A / 15W 16 5V-30V - -
16 Opto isolated inputs ( 0...30V ) and 16 relays
Special Features: Input edge detection ( 16 Flipflops through software readable ), Timeout detection ( switches all outputs off if software hangs ), IRQ on change of input signal
32 LED for optical function control ( display the state of all inputs and relays )
Examples for Visual-Studio .NET, Visual Basic, Visual C/C++, Borland, Agilent Vee, Labview, Sun Java and others
  More info...

                 
PCIOPTO16IOPCI - - - 16 5V-30V 16 5V-30V
16 Opto isolated inputs ( 0...30V ) and 16 Opto isolated outputs
Special Features: Input edge detection ( 16 Flipflops through software readable ), Timeout detection ( switch all outputs off if software hangs ), IRQ on change of input signal
32 LED for optical function control ( display the state of all inputs and outputs )  More info...


Description:

The inputs and outputs of a card are controlled by software.
If a relay is adressed a contact is either opened or closed. By that it is responsible to take into account, that the external current is not chosen to high, because in that case the switching contacts of the relay are overloaded. Every relay has two own connections, so that the switching between currents with different potentials and also the switching of alteranting voltage is possible.
In contrast to a relay, the controlling signal is light. Opto couplers can only switch DC circuits and record DC processes (opto inputs and outputs), but their special merits are high switching speed and a relatively wide voltage range (see technical data). All opto couplers have one common earthing. TTL conductions work bidirectional, they are inputs and outputs. Therefore, they can both record data and control external devices.


Usage:

Relay cards are very useful for the power switching. They are very flexible by choosing the used voltages and can also be used for currents higher than 1 A ore more. To switch surrent circuits on or off, which work with a alternating voltage of 25 V it is recommandable to use a 230 V card. With this card the 230 V are leaded direct to the PC. If this is not the result you can alternatively use a normal relay-, opto- coupler- or TTL- card, if you connect an extern relay with the corresponding current supply.
Opto coupler cards are used if a galvanical separation of circuits is needed or sensible (for example to avoid trouble when transmitting data over long dinstances). Without special drivers, they can only be used for low currents. The opto coupler card which records external switching processes fastest and most precisely is best suited.


Glossary:

Relays:
Relays are used as switches.
If a relay is connected by our cards, the switching contact is either opened or closed, so that a connected current circuit (with external power supply) is opened or closed. Please note, that the extern current must not be to big, otherwise the switching contacts of the relay is overloaded. There are two different types of relays. The switch-on relays close and the switch-over relays open or close one switching circuits each.

Opto coupler:
Switches depending on current which realize by their design a galvanical separation to the computer. Opto couplers switch very fast, but are restricted in the usability by a voltage range of 30 V direct current.

Galvanic separation:
'Galvanically separated' means that the separated components have no electrical conductions to each other. A galvanical separation to the computer guarantees that voltages of the module cannot break into the computer.

Common earthing:
All opto couplers are combined in 8 part groups. That means that 8 opto couplers have one common earthing. On reason for that is to avoid unnecessary sources of interference.