Measurement Computing CIO-PDISO8 - Manual (Page 7)

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Chapter 1
Introducing the CIO-PDISO8
Overview: CIO-PDISO8 features
The CIO-PDISO8 is an eight channel-isolated high voltage digital input and eight relay output interface board.
You can use the CIO-PDISO8 for control and sensing applications where high voltages need to be sensed or
controlled.
Caution! High voltages are present on the CIO-PDISO8 when you have connected high voltage inputs or
outputs to the CIO-PDISO8 connector. Use extreme caution! Never handle the CIO-PDISO8 when
signals are connected to the board through the connector.
Never remove the protective plates from the CIO-PDISO8.
The eight inputs are optically-isolated (500 V) inputs that can be read back as a single byte. The inputs are not
polarity sensitive, and may be driven by either AC (50 - 1000 Hz) or DC. Each input has a switchable low-pass
filter with a time constant of 5 ms (200 Hz).
Outputs are from eight electromechanical relays. Five relays have FORM C connections, and three relays
provide normally-open FORM A connections. The relays are controlled by writing to an 8-bit port. The relay
control register can be read back from the same port.
Signal conditioning installed
The CIO-PDISO8 is a combination digital I/O board with signal conditioning installed. Most accessory boards
provide signal conditioning or easy-to-access signal termination. The CIO-PDISO8 does not require additional
signal conditioning.
Caution! We recommend NOT using screw terminal boards with the CIO-PDISO8. The CIO-PDISO8 is
intended to sense and control high voltages. If you use a screw terminal board, you will expose
yourself and others to those high voltage signals. We recommend that you construct a safe cable to
carry your signals directly from your equipment to the CIO-PDISO8 connector.
Software features
For information on the features of InstaCal and the other software included with your CIO-PDISO8, refer to the
Quick Start Guide that shipped with your device.