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The OPT-851A daughter board provides optical isolation and signal conditioning of the DAQ cards output digital ports.

The board provides eight output blocks (isolated between each other) for switching DC signals up to 32V. All channels work as noninverting, i.e. high level on control port activates the output switch.

The control port operates in TTL/HC mode, but with output current at least 8mA at signal voltage 4V (meets all DAQ cards TEDIA).

Every channel is fitted with an indicating LED, signalizing high level on control port.

OPT-851A board is supplied as an unencapsulated kit, a plastic housing DIN-801 suitable for mounting on the 35 mm DIN rail is supplied optionally.

Delivery details

The product packet includes the board only (cables and DIN35 housing are not included), documentation is available in the Download section.


Type OPT-851A
Number of digital outputs 8
Switching voltage 24VDC nominal, 32VDC max.
Switching current
(without DIN-801 housing)
0.5A (every channel continuously)
Switching current
(with DIN-801 housing)
0.5A (every channel continuously)
(sum of currents of all switches max. 2.5A)
Output overload 1A (max. 100ms; max. once every ten seconds)
Drop voltage (switch ON)
(I=0.5 A)
Delay (OFF->ON, ON->OFF) <0.5ms
Isolation voltage 1.5kVRMS (inputs against DAQ card)
100VDC (between outputs)
Control port signals TTL/HC compatible signal levels
(at least 8mA against GND with 4V signal voltage)
Power supply not required
Dimensions approx. 72x88 mm
Weight approx. 70 g
Weight and dimensions
of product packaging
approx. 120 g
cardboard box approx. 180x130x40 mm