Measurement Computing PCI-PDISO8 - Manual (Page 5)

5
Chapter 1
Introducing the PCI-PDISO8
Overview: PCI-PDISO8 features
The PCI-PDISO8 is an eight channel-isolated high voltage digital input and eight relay output interface board.
You can use the PCI-PDISO8 for control and sensing applications where high voltages need to be sensed or
controlled.
Caution! High voltages are present on the PCI-PDISO8 board when you connect high voltage inputs or
outputs to the PCI-PDISO8 connector. Use extreme caution! Never handle the PCI-PDISO8 when
signals are connected to the board through the connector.
Never remove the protective plates from the PCI-PDISO8.
The eight inputs are individual, 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 channel has a
programmable low-pass filter with a time constant of 5 ms (200 Hz).
The eight outputs are electromechanical relays. Five relays provide Form C connections, and three relays
provide normally-open Form A connections. The relays are controlled by writing to an eight-bit port. The relay
control register can be read back from the same port.
Signal conditioning installed
The PCI-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 PCI-PDISO8 does not require additional
signal conditioning.
PCI-PDISO8 functions are illustrated in the block diagram shown here.
Figure 1. PCI-PDISO8 block diagram